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fix: flushdb may cause master-slave inconsistency #2808

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cheniujh
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@cheniujh cheniujh commented Jul 17, 2024

fix Issue #2708
discussion #2807

问题简述:因为Slave端消费Binlog线程模型的缘故,原有代码中主从执行flushdb后可能出现主从不一致的现象

背景:Pika Slave在消费一条Binlog时,按事件顺序分为两步,一是同步Apply Binlog, 也就是将收到的Binlog也追加到自己的BinlogFile中,二是异步多线程Apply DB, 也即将Binlog中抽取出来的命令写DB。具体地,Slave收到的所有Binlog都会顺序提交到一个固定的Binlog-Worker线程去消费,在这个Binlog-Worker线程上,会原地完成Apply Binlog的动作(同步地追加Binlog),之后会向另外一个WriteDBWorker线程池提交一个异步的WriteDB任务(按key来做hash决定使用池子里的哪一个DBworker)。长话短说就是:写Binlog的动作是单线程同步完成的,而写完Binlog之后,从Binlog中提取的WriteDB任务是提交到另一个线程池异步并发做的,并且按照key hash来选择worker thread问题就在于:Flushdb这样的命令没有key,按照这样的执行方式根本无法在slave保证正确的执行顺序。

Case举例

flushdb是一个会写binlog,却没有key的命令,每次都会固定取某个线程来执行ApplyDB/写DB的操作(应该是使用flushdb命令名做了hash)。
考虑这样一个case:
主节点实际落盘的顺序(同时也是Binlog的顺序)是:

  1. set key1 a1
  2. set key1 a2
  3. flushdb
  4. set key1 a3
    主节点执行完上述操作,主实际写DB的顺序是1, 2, 3, 4。 最后DB的状态是:有一个pair为:{key1, a3}

从节点在Apply完Binlog之后,会将这4条命令提交到WriteDBWorker线程池中的不同线程(按key做hash来分配,flushdb没有key,所以直接用的”flushdb“这个string来做hash),以下就是一种很有可能的分配结果:

WriteDBWorkerThread1执行:set key a1; set key1 a2; set key1 a3;
WriteDBWorkerThread2执行:flushdb

假如因为线程调度原因,thread1先执行完了这3个set,thread2才去执行flushdb, 那从节点实际落盘的顺序就是1, 2, 4, 3, 和主节点的落盘顺序不一致,进而导致主从不一致:flushdb是最后执行的(但实际上flushdb应该发生于set key1 a3命令之前),会导致整个从库DB是空的。但是按照正确预期, 主从应该一致,从库也应当有key1,值为a3。

这个case中flushdb被延后执行了,还有另一种正好相反的case:flushdb被提前执行了,就会出现主节点为空,从节点上却有数据的情况,性质和上述case几乎一样,就不具体阐述了。

解决方案

  • 必须确保flushdb命令之后的Binlog一定在flushdb执行完之后才被消费具体变动为:消费flushdb的Binlog时,将写Binlog以及WriteDB两个操作都放在WriteBinlogWorker上同步执行(原本是只有写Binlog任务在这里同步执行,WriteDB任务被分发到DBWorker线程池),说白了就是flushdb特殊化一下,WriteDB的动作从异步改为同步。修改之后:能确保位于flushdb命令之后的Binlog不可能在flushdb执行完毕之前被提交到异步的DBWorker池子里,也就不可能会比flushdb更早执行

  • 必须确保flushdb命令在真正执行之前,位于flushdb之前的所有WriteDB任务都已经完成了(操作已经写入RocksDB, 而不是还在某个WriteDBWorker的任务队列中排队)。具体变动为:在BinlogWorker上新增一个提交计数/正在异步执行的WriteDB任务的计数。每次BinlogWorker向WriteDBWorker池子中提交WriteDB任务时,都对这个计数加1,每当有相应的WriteDB任务完成,都对这个计数减1(加一个回调函数即可)。在消费到flushdb的binlog时,需要在BinlogWorker上将flushdb进行同步地WriteDB前,需要先检查这个任务计数是否为0,如果不为0,就sleep一会(等待前面的异步WriteDB任务被执行完),再次检查该计数,一直等到该任务计数归0,才去原地将flushdb的操作apply到DB。(为什么这个任务计数一定能等到归0:这个任务计数只有在BinlogWorker向WriteDBWorker池子异步提交任务时才会做自增,而这里的sleep等待实际上就是BinlogWorker在等待,换而言之,在这条同步消费的flushdb完全完成之前,下一条Binlog都不会被消费,也不会有任何的WriteDB任务被提交到WriteDBWoker的池子)。修改之后: 能确保flushdb之前的Binlog所对应的WriteDB任务一定都执行完了,才会执行flushdb,能避免出现:执行完flushdb之后(即写了binlog,也已经清空了DB),滞留在WriteDBWorker队列中的WriteDB任务才执行(即先于flushdb的命令在flushdb之后才执行)。

Problem Summary: Due to the Slave end's Binlog consumption thread model, executing flushdb on both master and slave in the original code may result in inconsistencies between master and slave.

Background: When Pika Slave consumes a Binlog, it follows two steps in order: first, Apply Binlog, which appends the received Binlog to its own BinlogFile; second, Apply DB, which extracts the commands from the Binlog and writes them to the DB. Specifically, all Binlogs received by the Slave are sequentially submitted to a fixed Binlog-Worker thread for consumption. On the Binlog-Worker thread, the Apply Binlog action (synchronously appending the Binlog) is completed in place. Subsequently, an asynchronous WriteDB task is submitted to another WriteDBWorker thread pool (the specific DBworker in the pool is assigned based on the key). In short: the Binlog writing action is completed synchronously by a single thread, while the WriteDB tasks extracted from the Binlog are submitted to another thread pool for asynchronous concurrent execution.

Example Case:

After Pika's Slave applies the Binlog, it distributes the corresponding WriteDB tasks to multiple threads, using key hash to assign threads.
flushdb is a command that writes to the Binlog but does not have a key, and it always uses a fixed thread to execute the ApplyDB/WriteDB operation.
Consider this case:
The actual write order on the master (which is also the Binlog order) is:

  1. set key1 a1
  2. set key1 a2
  3. flushdb
  4. set key1 a3
    After the master executes the above operations, the actual DB write order on the master is 1, 2, 3, 4. The final DB state is: there is one pair: {key1, a3}

However, after the slave applies the Binlog, it submits these 4 commands to different threads in the WriteDBWorker thread pool (assigned by key hash, flushdb has no key, so the string "flushdb" is used for hashing). The following is a very likely assignment result:

WriteDBWorkerThread1 executes: set key a1; set key1 a2; set key1 a3;
WriteDBWorkerThread2 executes: flushdb

If due to thread scheduling reasons, thread1 completes these 3 sets first, and then thread2 executes flushdb, then the actual write order on the slave is 1, 2, 4, 3, which is inconsistent with the master's write order, leading to master-slave inconsistency: flushdb is executed last (but in fact, flushdb should occur before set key1 a3), resulting in the entire slave DB being empty. However, as expected, the master and slave should be consistent, and the slave DB should also have key1 with value a3.

In this case, flushdb is delayed. Another similar case is when flushdb is executed earlier, leading to a situation where the master DB is empty, but the slave DB has data. The nature is almost the same as the above case, so it will not be elaborated further.

Solution:

  • Ensure that Binlogs after the flushdb command are not consumed until flushdb is executed. Specifically: when consuming the flushdb Binlog, both the Binlog writing and the WriteDB operations are performed synchronously on the WriteBinlogWorker (originally only the Binlog writing task was done synchronously here, while the WriteDB task was dispatched to the DBWorker thread pool). Simply put, flushdb is treated specially, changing the WriteDB action from asynchronous to synchronous. After the change: it ensures that Binlogs following the flushdb command cannot be submitted to the asynchronous DBWorker pool before flushdb is completed, and thus cannot be executed earlier than flushdb.

  • Ensure that before the flushdb command is actually executed, all WriteDB tasks prior to flushdb have been completed (operations have been written to RocksDB, not just queued in some WriteDBWorker's task queue). Specifically: add a counter for submitted/ongoing asynchronous WriteDB tasks on the BinlogWorker. Each time the BinlogWorker submits a WriteDB task to the WriteDBWorker pool, this counter is incremented by 1. When a corresponding WriteDB task is completed, the counter is decremented by 1 (adding a callback function). When consuming the flushdb Binlog, before synchronously executing WriteDB for flushdb on the BinlogWorker, it needs to check if this task count is 0. If not, it sleeps for a while (waiting for the previous asynchronous WriteDB tasks to complete), then rechecks the count, and waits until this task count reaches 0 before applying the flushdb operation to the DB in place. (Why this task count can definitely reach 0: this task count only increments when the BinlogWorker submits tasks asynchronously to the WriteDBWorker pool. The sleep wait here means the BinlogWorker is waiting. In other words, before this synchronous flushdb consumption is fully completed, the next Binlog will not be consumed, and no WriteDB task will be submitted to the WriteDBWorker pool). After the change: it ensures that all WriteDB tasks corresponding to Binlogs before flushdb are completed before executing flushdb, avoiding the situation where: after executing flushdb (i.e., writing the Binlog and clearing the DB), the WriteDB tasks remaining in the WriteDBWorker queue are executed (i.e., commands prior to flushdb are executed after flushdb).

Summary by CodeRabbit

  • New Features

    • Introduced methods to manage asynchronous database write tasks.
    • Added support for callback functions in task scheduling methods.
    • Enhanced synchronous writing capabilities for better database command control.
  • Bug Fixes

    • Updated method signatures to improve callback and task handling.
  • Refactor

    • Removed obsolete parameters from constructors and methods for clarity.
    • Consolidated and streamlined task handling logic for improved performance.
  • Performance Improvements

    • Enhanced asynchronous processing for command handling and database operations.

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coderabbitai bot commented Jul 17, 2024

Walkthrough

The recent updates significantly enhance asynchronous task management and callback mechanisms across various Pika components, including ConsensusCoordinator, ReplicaManager, and ReplClient. New methods for managing asynchronous write task counts have been introduced, while existing methods have been streamlined to improve concurrency handling and synchronization in database operations. These changes aim to provide a more flexible and efficient framework for executing tasks and managing interactions.

Changes

File Change Summary
include/pika_consensus.h Modified InternalApplyFollower to accept a std::shared_ptr<Cmd> and added async task count management methods.
include/pika_repl_client.h, src/pika_rm.h Updated ScheduleWriteDBTask to use a shared pointer and simplify parameters, focusing on callbacks.
src/pika_repl_client.cc Enhanced ScheduleWriteDBTask to include callback functionality for post-execution actions.
src/pika_rm.cc Streamlined ScheduleWriteDBTask by removing LogOffset parameter, improving resource management.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant ConsensusCoordinator
    participant Cmd
    participant ReplicaManager
    participant ReplClient

    Client->>ConsensusCoordinator: Send Command
    ConsensusCoordinator->>Cmd: Create Cmd Ptr
    Cmd-->>ConsensusCoordinator: Return Cmd Ptr
    ConsensusCoordinator->>ReplicaManager: Schedule Write Task (Cmd Ptr, Callback)
    ReplicaManager->>ReplClient: Schedule Write Task (Cmd Ptr, Callback)
    ReplClient->>Cmd: Execute Cmd
    Cmd-->>ReplClient: Return Success
    ReplClient->>ReplicaManager: Callback Execution
    ReplicaManager->>ConsensusCoordinator: Callback Execution
    ConsensusCoordinator->>Client: Acknowledge Completion
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Poem

In the realm of code so vast,
Where tasks now swiftly cast,
Async writes rise and fall,
Coordinated, one and all.
With callbacks in place, so discreet,
Our database dance is now complete.
Cheers to progress, smooth and sweet!


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@github-actions github-actions bot added the ☢️ Bug Something isn't working label Jul 17, 2024
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Actionable comments posted: 0

Outside diff range, codebase verification and nitpick comments (1)
include/pika_repl_bgworker.h (1)

30-30: Consider adding documentation for WriteDBInSyncWay.

It would be beneficial to include documentation for the new WriteDBInSyncWay method to explain its role, especially how it contributes to resolving the master-slave inconsistency issues.

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 057812f and c6606ef.

Files selected for processing (8)
  • include/pika_consensus.h (2 hunks)
  • include/pika_repl_bgworker.h (1 hunks)
  • include/pika_repl_client.h (3 hunks)
  • include/pika_rm.h (1 hunks)
  • src/pika_consensus.cc (2 hunks)
  • src/pika_repl_bgworker.cc (2 hunks)
  • src/pika_repl_client.cc (1 hunks)
  • src/pika_rm.cc (2 hunks)
Additional comments not posted (18)
include/pika_repl_bgworker.h (3)

30-30: New method WriteDBInSyncWay added.

The addition of WriteDBInSyncWay appears to be a crucial part of the solution to ensure synchronous execution of the flushdb command as described in the PR. This method should help in maintaining the order of operations between master and slave.


30-30: SetThreadName method update.

The update to use bg_thread_.set_thread_name(thread_name) directly within SetThreadName is a cleaner approach and likely improves readability and maintainability of thread management.


30-30: Ensure thread safety for WriteDBInSyncWay.

Given that WriteDBInSyncWay is static and likely accessed from multiple threads, ensure that all its internal operations are thread-safe, particularly if it manipulates any shared resources.

Verification successful

Ensure thread safety for WriteDBInSyncWay.

The WriteDBInSyncWay method uses pstd::lock::MultiRecordLock and DBLockShared, which provide synchronization mechanisms to ensure thread safety. The MultiRecordLock class locks and unlocks keys, and the DBLockShared method uses a shared lock to manage concurrent access. These mechanisms should be sufficient to ensure thread safety for the operations within WriteDBInSyncWay.

  • MultiRecordLock: Handles locking and unlocking of keys.
  • DBLockShared: Provides shared locking for database operations.

These synchronization techniques should ensure that WriteDBInSyncWay is thread-safe when accessing shared resources.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Search for usages of `WriteDBInSyncWay` to ensure thread safety.

# Test: Search for the method usage. Expect: Proper synchronization mechanisms around its usage.
rg --type cpp -A 5 $'WriteDBInSyncWay'

Length of output: 1310


Script:

#!/bin/bash
# Extract the full implementation of `WriteDBInSyncWay` from `src/pika_repl_bgworker.cc`
ast-grep --lang cpp --pattern $'void PikaReplBgWorker::WriteDBInSyncWay(const std::shared_ptr<Cmd>& c_ptr) {
  $$$
}' 

# Check the context of its usage in `src/pika_repl_bgworker.cc` and `src/pika_consensus.cc`
rg --type cpp -A 10 -B 10 'WriteDBInSyncWay' src/pika_repl_bgworker.cc src/pika_consensus.cc

Length of output: 3007


Script:

#!/bin/bash
# Extract the implementation of `pstd::lock::MultiRecordLock` to understand its behavior.
ast-grep --lang cpp --pattern $'class MultiRecordLock {
  $$$
}' 

# Check for other shared resources within `WriteDBInSyncWay`.
rg --type cpp 'WriteDBInSyncWay' -A 20 src/pika_repl_bgworker.cc

Length of output: 1289


Script:

#!/bin/bash
# Search for the definition and implementation of `MultiRecordLock`
rg --type cpp 'class MultiRecordLock' 

# Verify if `DBLockShared` and cache operations are thread-safe
rg --type cpp 'DBLockShared' 
rg --type cpp 'cache()->CacheStatus()' 

Length of output: 924


Script:

#!/bin/bash
# Extract the implementation of `MultiRecordLock` from `src/pstd/include/scope_record_lock.h`
rg --type cpp -A 20 'class MultiRecordLock' src/pstd/include/scope_record_lock.h

# Extract the implementation of `DBLockShared` from `include/pika_server.h` and `include/pika_db.h`
rg --type cpp -A 10 'void DBLockShared()' include/pika_server.h include/pika_db.h

Length of output: 1396

include/pika_repl_client.h (3)

47-49: Constructor change in ReplClientWriteDBTaskArg.

The new constructor uses a callback function, which aligns with the PR's objective to enhance control over asynchronous task completions. This change should help in ensuring that tasks related to database writes are completed before proceeding with critical operations like flushdb.


68-68: Method signature change in ScheduleWriteDBTask.

Replacing LogOffset and std::string db_name with a callback function in ScheduleWriteDBTask enhances the method's flexibility and supports better synchronization of database operations, crucial for the consistency issues addressed in this PR.


89-91: Important notice about WriteDBWorker task queue.

The added comment about not clearing the WriteDBWorker task queue is crucial for understanding the changes in task management. This ensures that developers are aware of the implications of these task queues on the system's consistency.

include/pika_consensus.h (4)

167-169: Method to increment async task count.

The addition of IncrUnfinishedAsyncWriteDbTaskCount is essential for managing the count of ongoing asynchronous write tasks. This method supports the new synchronization mechanism by ensuring that all tasks are accounted for before proceeding with critical operations.


171-173: Method to decrement async task count.

Similarly, DecrUnfinishedAsyncWriteDbTaskCount allows for the decrementing of the task count, which is crucial for tracking the completion of asynchronous operations. This method is vital for the synchronization logic introduced in this PR.


181-181: Signature change in InternalApplyFollower.

The inclusion of a callback function in InternalApplyFollower is a significant change that enhances the control over the execution sequence of commands, which is critical for maintaining consistency across the master-slave setup.


210-214: Explanation of unfinished_async_write_db_task_count_.

The detailed comment on the usage of unfinished_async_write_db_task_count_ provides clarity on its role in ensuring that flushdb operations wait for all preceding tasks to complete, which is a key part of the solution to the inconsistency problem.

include/pika_rm.h (1)

186-186: Updated method signature in ScheduleWriteDBTask.

The change to include a callback function in ScheduleWriteDBTask instead of previous parameters aligns with the PR's objectives to enhance task synchronization and control, which is crucial for maintaining database consistency in asynchronous environments.

src/pika_repl_bgworker.cc (2)

208-210: Verify integration of WriteDBInSyncWay and callback handling in HandleBGWorkerWriteDB.

The method now uses WriteDBInSyncWay for synchronous DB writes followed by a callback function. Verify that the callback is appropriately handled and does not lead to race conditions or other concurrency issues.

Verification successful

Verified integration of WriteDBInSyncWay and callback handling in HandleBGWorkerWriteDB.

The callback function is passed through multiple scheduling functions and is invoked after the synchronous DB write without any immediate signs of concurrency issues.

  • src/pika_repl_bgworker.cc: Callback function call_back_fun is invoked after WriteDBInSyncWay.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the correct handling and integration of the callback function post synchronous DB write.

# Test: Search for the method usage and callback handling patterns. Expect: Proper integration without concurrency issues.
rg --type c++ "call_back_fun"

Length of output: 57


Script:

#!/bin/bash
# Description: Verify the correct handling and integration of the callback function post synchronous DB write.

# Test: Search for the method usage and callback handling patterns. Expect: Proper integration without concurrency issues.
rg --type-add 'cpp:*.{cc,cpp,h}' "call_back_fun"

Length of output: 1329


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#!/bin/bash
# Description: Extract code blocks around `call_back_fun` usage to verify proper handling and integration.

# Extract 10 lines of context around each match for better understanding.
rg --type-add 'cpp:*.{cc,cpp,h}' "call_back_fun" -A 10 -B 10

Length of output: 12729


212-212: Review new method WriteDBInSyncWay for correctness and performance.

The addition of WriteDBInSyncWay introduces new synchronization logic. Ensure that the locking mechanisms and conditional checks are correctly implemented to prevent deadlocks and ensure data integrity.

Verification successful

Let's correct the rg command to search for C++ files and rerun the search to gather the necessary information.

Additionally, let's search for the implementation of WriteDBInSyncWay to review its synchronization mechanisms.


Let's extract and review the implementation of WriteDBInSyncWay from src/pika_repl_bgworker.cc and check the usage in src/pika_consensus.cc.


Let's extract more lines from the implementation of WriteDBInSyncWay to review the complete method for proper synchronization mechanisms.


Let's extract the remaining lines from the implementation of WriteDBInSyncWay to review the complete method for proper synchronization mechanisms.


The WriteDBInSyncWay method is implemented correctly and follows proper synchronization mechanisms.

The method uses MultiRecordLock and shared DB locks to ensure thread safety and data integrity. The conditional checks and additional operations for write commands are also correctly handled.

  • src/pika_repl_bgworker.cc: Implementation of WriteDBInSyncWay
  • src/pika_consensus.cc: Usage of WriteDBInSyncWay
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Search for all usages of `WriteDBInSyncWay` to verify correct implementation and usage patterns.

# Test: Search for the method usage. Expect: Correct usage patterns without potential deadlocks.
rg --type c++ "WriteDBInSyncWay"

Length of output: 60


Script:

#!/bin/bash
# Description: Search for all usages of `WriteDBInSyncWay` to verify correct implementation and usage patterns.

# Corrected Test: Search for the method usage in C++ files. Expect: Correct usage patterns without potential deadlocks.
rg --type-add 'cpp:*.{cc,cpp,cxx,h,hpp,hxx}' -t cpp "WriteDBInSyncWay"

Length of output: 393


Script:

#!/bin/bash
# Description: Search for the implementation of `WriteDBInSyncWay` to review synchronization mechanisms.

# Test: Search for the method definition. Expect: Proper synchronization mechanisms to prevent deadlocks and ensure data integrity.
rg "void PikaReplBgWorker::WriteDBInSyncWay"

Length of output: 149


Script:

#!/bin/bash
# Extract the implementation of WriteDBInSyncWay from src/pika_repl_bgworker.cc
rg -A 20 "void PikaReplBgWorker::WriteDBInSyncWay" src/pika_repl_bgworker.cc

Length of output: 833


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#!/bin/bash
# Check the usage of WriteDBInSyncWay in src/pika_consensus.cc
rg -A 5 "WriteDBInSyncWay" src/pika_consensus.cc

Length of output: 225


Script:

#!/bin/bash
# Extract more lines from the implementation of WriteDBInSyncWay from src/pika_repl_bgworker.cc
rg -A 40 "void PikaReplBgWorker::WriteDBInSyncWay" src/pika_repl_bgworker.cc

Length of output: 1431


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#!/bin/bash
# Extract the remaining lines from the implementation of WriteDBInSyncWay from src/pika_repl_bgworker.cc
rg -A 60 "void PikaReplBgWorker::WriteDBInSyncWay" src/pika_repl_bgworker.cc

Length of output: 2190

src/pika_repl_client.cc (1)

101-105: Review changes to ScheduleWriteDBTask for correct memory management and callback integration.

The method now uses std::move for the cmd_ptr and includes a callback function. Verify that std::move is correctly used to manage memory efficiently and that the callback function is properly integrated and handled.

Verification successful

The changes to ScheduleWriteDBTask use std::move correctly for efficient memory management and ensure proper callback integration.

  • The std::move usage for cmd_ptr and call_back_fun in the ReplClientWriteDBTaskArg constructor is appropriate and ensures efficient memory management and ownership transfer.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the correct usage of `std::move` and callback handling.

# Test: Search for usage patterns of `std::move` and callback in `ScheduleWriteDBTask`. Expect: Correct memory management and callback integration.
rg --type c++ "std::move"

Length of output: 53


Script:

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# Description: Verify the correct usage of `std::move` and callback handling in C++ files.

# Locate all C++ files and search for `std::move` within those files.
fd -e cc -e cpp -e h -e hpp | xargs rg "std::move"

Length of output: 39164


Script:

#!/bin/bash
# Description: Verify the handling of `call_back_fun` within `ReplClientWriteDBTaskArg`.

# Locate the definition and implementation of `ReplClientWriteDBTaskArg` to inspect its constructor.
fd -e cc -e cpp -e h -e hpp | xargs rg "ReplClientWriteDBTaskArg"

Length of output: 553


Script:

#!/bin/bash
# Description: Verify the handling of `call_back_fun` within `ReplClientWriteDBTaskArg`.

# Search for the implementation of the `ReplClientWriteDBTaskArg` constructor.
fd -e cc -e cpp -e h -e hpp | xargs rg "ReplClientWriteDBTaskArg::ReplClientWriteDBTaskArg"

Length of output: 91


Script:

#!/bin/bash
# Description: Display the contents of `include/pika_repl_client.h` to inspect the constructor of `ReplClientWriteDBTaskArg`.

# Display the contents of `include/pika_repl_client.h`.
cat include/pika_repl_client.h

Length of output: 4210

src/pika_consensus.cc (2)

349-370: Verify synchronization logic for handling flushdb commands in ProcessLeaderLog.

The function now ensures that all preceding tasks are completed before executing flushdb commands synchronously. This is critical for maintaining consistency. Verify that the loop correctly waits for all tasks to complete and that the synchronization logic is robust and efficient.

Verification successful

Verified synchronization logic for handling flushdb commands in ProcessLeaderLog.

The function correctly ensures that all preceding tasks are completed before executing flushdb commands synchronously, maintaining database consistency.

  • The loop waits for all unfinished asynchronous write tasks to finish before proceeding.
  • Both InternalAppendLog and WriteDBInSyncWay are applied synchronously for flushdb commands.
Scripts executed

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Script:

#!/bin/bash
# Description: Verify the synchronization logic for handling `flushdb` commands.

# Test: Search for usage patterns of synchronization logic in `ProcessLeaderLog`. Expect: Robust and efficient handling of `flushdb` commands.
rg --type c++ "flushdb"

Length of output: 51


Script:

#!/bin/bash
# Description: Verify the synchronization logic for handling `flushdb` commands in `ProcessLeaderLog`.

# Test: Search for usage patterns of synchronization logic in `ProcessLeaderLog`. Expect: Robust and efficient handling of `flushdb` commands.
rg "flushdb" src/pika_consensus.cc -A 10

Length of output: 870


428-429: Review changes to InternalApplyFollower for correct callback integration.

The function now includes a callback function to handle asynchronous tasks more effectively. Verify that the callback is properly integrated and that it does not introduce any new issues such as race conditions or memory leaks.

Verification successful

The callback function in InternalApplyFollower is properly integrated and executed.

The callback function is passed through multiple layers and is eventually executed without any apparent issues. The integration appears to be correct, and there are no signs of race conditions or memory leaks from the provided context.

  • InternalApplyFollower calls ScheduleWriteDBTask.
  • ScheduleWriteDBTask further calls another ScheduleWriteDBTask in pika_repl_client_.
  • The callback is executed in PikaReplBgWorker::HandleBGWorkerWriteDB as task_arg->call_back_fun().
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#!/bin/bash
# Description: Verify the correct integration of the callback function in `InternalApplyFollower`.

# Test: Search for usage patterns of the callback function in `InternalApplyFollower`. Expect: Proper integration without introducing issues.
rg --type c++ "call_back_fun"

Length of output: 57


Script:

#!/bin/bash
# Description: Verify the correct integration of the callback function in `InternalApplyFollower`.

# Test: Search for usage patterns of the callback function in `InternalApplyFollower`. Expect: Proper integration without introducing issues.
rg --type cpp "call_back_fun" -A 10

Length of output: 7307


Script:

#!/bin/bash
# Description: Trace the flow and usage of the callback function from `InternalApplyFollower` to its execution point.

# Step 1: Locate the definition of `InternalApplyFollower` to understand its context.
rg --type cpp "void ConsensusCoordinator::InternalApplyFollower" -A 10

# Step 2: Locate the definition of `ScheduleWriteDBTask` to see how the callback is passed.
rg --type cpp "void PikaReplicaManager::ScheduleWriteDBTask" -A 10

# Step 3: Locate the execution point of the callback function to ensure it is properly handled.
rg --type cpp "task_arg->call_back_fun()" -A 10

Length of output: 2316

src/pika_rm.cc (2)

40-41: Verify the syntax and functionality of the SyncMasterDB constructor.

The addition of an additional curly brace in the constructor should be checked to ensure it doesn't introduce syntax errors or affect the functionality.

Verification successful

The constructor of SyncMasterDB is correctly implemented.

The constructor does not introduce any syntax errors or functional issues. The addition of the curly brace is syntactically correct and does not affect the functionality.

  • src/pika_rm.cc, lines 40-41
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# Description: Verify the syntax and functionality of the SyncMasterDB constructor.

# Test: Search for syntax errors in the constructor.
rg --type cpp -A 5 $'SyncMasterDB::SyncMasterDB'

Length of output: 333


687-688: Approve the changes to ScheduleWriteDBTask and suggest verification.

The modification to accept a std::function<void()> parameter enhances flexibility. Ensure this change integrates well with the rest of the system.

Verification successful

Verified the integration of ScheduleWriteDBTask changes.

The modification to accept a std::function<void()> parameter is consistently applied across the relevant files. Ensure to manually review the functionality to confirm that the callback function is properly utilized.

  • include/pika_rm.h: Declaration of ScheduleWriteDBTask.
  • include/pika_repl_client.h: Declaration of ScheduleWriteDBTask.
  • src/pika_consensus.cc: Usage of ScheduleWriteDBTask.
  • src/pika_repl_client.cc: Implementation of ScheduleWriteDBTask.
  • src/pika_rm.cc: Implementation of ScheduleWriteDBTask.
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# Description: Verify integration of the changes to ScheduleWriteDBTask.

# Test: Search for usages of ScheduleWriteDBTask to ensure correct integration.
rg --type cpp -A 5 $'ScheduleWriteDBTask'

Length of output: 2587

src/pika_rm.cc Outdated Show resolved Hide resolved
@wangshao1
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其实如果把引用计数减一的操作放到队列任务的析构函数里去做比较好。但是现在队列任务并不能保证一定被执行,一定被析构,所以可能得连着一块改,比如改成unique_ptr管理,而不是用一个裸指针。

@Issues-translate-bot
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Bot detected the issue body's language is not English, translate it automatically.


In fact, it would be better if you put the operation of decrementing the reference count by one in the destructor of the queue task. But now there is no guarantee that queue tasks will be executed or destructed, so they may have to be changed together, such as changing to unique_ptr management instead of using a raw pointer.

@cheniujh
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其实如果把引用计数减一的操作放到队列任务的析构函数里去做比较好。但是现在队列任务并不能保证一定被执行,一定被析构,所以可能得连着一块改,比如改成unique_ptr管理,而不是用一个裸指针。

done

@Issues-translate-bot
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Bot detected the issue body's language is not English, translate it automatically.


In fact, it would be better if you put the operation of decrementing the reference count by one in the destructor of the queue task. But now there is no guarantee that queue tasks will be executed or destructed, so they may have to be changed together, such as changing to unique_ptr management instead of using a raw pointer.

done

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Actionable comments posted: 1

Outside diff range, codebase verification and nitpick comments (4)
include/pika_repl_bgworker.h (1)

28-28: Some calls to Schedule do not match the updated signature.

The Schedule method in include/pika_repl_bgworker.h has been modified to accept a callback function of type std::function<void()>. However, there are several instances in the codebase where Schedule is still being called with the old signature. Please update all calls to Schedule to match the new signature where necessary.

  • src/pika_repl_server.cc
  • src/pika_server.cc
  • src/pika_rm.cc
  • src/pika_repl_client.cc
  • src/rsync_server.cc
  • src/pika_repl_bgworker.cc
Analysis chain

LGTM! Verify the usage of the updated Schedule method.

The addition of a callback function to the Schedule method enhances its functionality.

Ensure that all calls to Schedule are updated to use the new signature where necessary.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all function calls to `Schedule` match the new signature.

# Test: Search for the function usage. Expect: Only occurrences of the new signature.
rg --type cpp -A 5 $'Schedule'

Length of output: 29755

src/net/include/bg_thread.h (1)

44-44: Update required: Some calls to the Schedule method still use the old signature.

The following instances of the Schedule method need to be updated to use the new signature with the callback function:

  • src/pika_list.cc: g_pika_server->ScheduleClientPool(&ServeAndUnblockConns, args, is_slow_cmd, is_admin_cmd);
  • src/pika_repl_client.cc: write_binlog_workers_[next_avail_]->Schedule(func, arg);
  • src/pika_repl_client.cc: write_binlog_workers_[index]->Schedule(func, arg);
  • src/pika_repl_client.cc: write_binlog_workers_[index]->Schedule(&PikaReplBgWorker::HandleBGWorkerWriteBinlog, static_cast<void*>(task_arg));
  • src/pika_repl_bgworker.cc: bg_thread_.Schedule(func, arg);
  • src/pika_rm.cc: pika_repl_server_->Schedule(func, arg);
  • src/pika_rm.cc: pika_repl_client_->Schedule(func, arg);
  • src/pika_rm.cc: pika_repl_client_->ScheduleByDBName(func, arg, db_name);
  • src/pika_server.cc: bgsave_thread_.Schedule(func, arg);
  • src/pika_server.cc: purge_thread_.Schedule(func, arg);
  • src/pika_server.cc: key_scan_thread_.Schedule(func, arg);
  • src/pika_server.cc: common_bg_thread_.Schedule(&DoCacheBGTask, static_cast<void*>(arg));
  • src/rsync_server.cc: work_thread_->Schedule(func, arg);
  • src/pika_repl_server.cc: server_tp_->Schedule(func, arg);
  • src/pika_client_processor.cc: pool_->Schedule(func, arg);

Please update these instances to match the new method signature.

Analysis chain

LGTM! Verify the usage of the updated Schedule method.

The addition of a callback function to the Schedule method enhances its functionality.

Ensure that all calls to Schedule are updated to use the new signature where necessary.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all function calls to `Schedule` match the new signature.

# Test: Search for the function usage. Expect: Only occurrences of the new signature.
rg --type cpp -A 5 $'Schedule'

Length of output: 29755

src/net/src/bg_thread.cc (1)

23-32: Update all Schedule method calls to use the new signature

The Schedule method has been updated to accept a callback function of type std::function<void()>. However, there are still instances in the codebase where the old signature is being used. Please update the following instances to use the new signature:

  • src/pika_server.cc

    • Line 23: pika_slow_cmd_thread_pool_->Schedule(func, arg);
    • Line 28: pika_admin_cmd_thread_pool_->Schedule(func, arg);
    • Line 33: pika_client_processor_->SchedulePool(func, arg);
    • Line 54: bgsave_thread_.Schedule(func, arg);
    • Line 61: purge_thread_.Schedule(func, arg);
    • Line 75: purge_thread_.Schedule(function, arg);
    • Line 91: key_scan_thread_.Schedule(func, arg);
    • Line 102: bgsave_thread_.Schedule(&DoBgslotsreload, static_cast<void*>(this));
    • Line 108: bgslots_cleanup_thread_.Schedule(&DoBgslotscleanup, static_cast<void*>(this));
    • Line 114: common_bg_thread_.Schedule(&DoCacheBGTask, static_cast<void*>(arg));
    • Line 120: common_bg_thread_.Schedule(&DoCacheBGTask, static_cast<void*>(arg));
    • Line 126: common_bg_thread_.Schedule(&DoCacheBGTask, static_cast<void*>(arg));
  • src/pika_rm.cc

    • Line 23: pika_repl_server_->Schedule(func, arg);
    • Line 27: pika_repl_client_->Schedule(func, arg);
    • Line 31: pika_repl_client_->ScheduleByDBName(func, arg, db_name);
    • Line 37: pika_repl_client_->ScheduleWriteBinlogTask(db, res, conn, res_private_data);
  • src/pika_repl_client.cc

    • Line 11: write_binlog_workers_[next_avail_]->Schedule(func, arg);
    • Line 16: write_binlog_workers_[index]->Schedule(func, arg);
    • Line 33: write_binlog_workers_[index]->Schedule(&PikaReplBgWorker::HandleBGWorkerWriteBinlog, static_cast<void*>(task_arg));
    • Line 43: write_db_workers_[index]->Schedule(&PikaReplBgWorker::HandleBGWorkerWriteDB, static_cast<void*>(task_arg), call_back_fun);
  • src/pika_repl_bgworker.cc

    • Line 3: bg_thread_.Schedule(func, arg);
  • src/rsync_server.cc

    • Line 3: work_thread_->Schedule(func, arg);
    • Line 23: ((RsyncServer*)(data_))->Schedule(&RsyncServerConn::HandleMetaRsyncRequest, task_arg);
    • Line 28: ((RsyncServer*)(data_))->Schedule(&RsyncServerConn::HandleFileRsyncRequest, task_arg);
  • src/pika_client_processor.cc

    • Line 3: pool_->Schedule(func, arg);
  • src/net/src/bg_thread.cc

    • Line 3: bg_thread_.Schedule(func, arg);
  • src/pika_repl_server_conn.cc

    • Line 23: g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleMetaSyncRequest, task_arg);
    • Line 30: g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleTrySyncRequest, task_arg);
    • Line 37: g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleDBSyncRequest, task_arg);
    • Line 44: g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleBinlogSyncRequest, task_arg);
    • Line 51: g_pika_rm->ScheduleReplServerBGTask(&PikaReplServerConn::HandleRemoveSlaveNodeRequest, task_arg);
  • src/pika_repl_client_conn.cc

    • Line 23: g_pika_rm->ScheduleReplClientBGTask(&PikaReplClientConn::HandleMetaSyncResponse, static_cast<void*>(task_arg));
    • Line 30: g_pika_rm->ScheduleReplClientBGTask(&PikaReplClientConn::HandleDBSyncResponse, static_cast<void*>(task_arg));
    • Line 43: g_pika_rm->ScheduleReplClientBGTaskByDBName(&PikaReplClientConn::HandleTrySyncResponse, static_cast<void*>(task_arg), db_name);
    • Line 50: g_pika_rm->ScheduleReplClientBGTask(&PikaReplClientConn::HandleRemoveSlaveNodeResponse, static_cast<void*>(task_arg));
    • Line 56: g_pika_rm->ScheduleWriteBinlogTask(binlog_nums.first.db_name_, res, std::dynamic_pointer_cast<PikaReplClientConn>(shared_from_this()), reinterpret_cast<void*>(binlog_nums.second));

Please ensure that all calls to Schedule are updated to use the new signature with the callback parameter where necessary.

Analysis chain

LGTM! Verify the usage of the updated Schedule method.

The addition of a callback function to the Schedule method enhances its functionality.

Ensure that all calls to Schedule are updated to use the new signature where necessary.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all function calls to `Schedule` match the new signature.

# Test: Search for the function usage. Expect: Only occurrences of the new signature.
rg --type cpp -A 5 $'Schedule'

Length of output: 29755

src/pika_repl_client.cc (1)

101-106: Callback function is not invoked after scheduling the write task.

The HandleBGWorkerWriteDB method does not invoke the callback function, which means the callback is not executed as expected after the task is completed. This needs to be addressed to ensure the callback function is properly invoked.

  • src/pika_repl_bgworker.cc: HandleBGWorkerWriteDB method
Analysis chain

Verify the correctness of the callback function usage.

The new implementation uses a callback function to be executed after scheduling the write task. Ensure that the callback function is correctly passed and executed by the background worker.


Ensure the callback function is invoked after scheduling the write task.

The current implementation of HandleBGWorkerWriteDB does not invoke the callback function. Verify if the Schedule method or any other part of the code is responsible for invoking the callback function. If the callback is not invoked, it should be flagged as an issue.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the usage of the callback function in the background worker.

# Test: Search for the callback function usage in the background worker. Expect: Correct invocation of the callback function.
rg --type cpp -A 5 $'HandleBGWorkerWriteDB'

Length of output: 1294


Script:

#!/bin/bash
# Description: Verify if the callback function is invoked after scheduling the write task.

# Test: Search for the invocation of the callback function in the Schedule method or any other related part of the code.

# Check the Schedule method in the write_db_workers_ class
rg --type cpp -A 5 $'Schedule'

# Check if the callback function is invoked elsewhere in the codebase
rg --type cpp 'call_back_fun'

Length of output: 30883

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between c6606ef and 943b94e.

Files selected for processing (7)
  • include/pika_consensus.h (2 hunks)
  • include/pika_repl_bgworker.h (2 hunks)
  • include/pika_repl_client.h (3 hunks)
  • src/net/include/bg_thread.h (3 hunks)
  • src/net/src/bg_thread.cc (5 hunks)
  • src/pika_repl_bgworker.cc (2 hunks)
  • src/pika_repl_client.cc (1 hunks)
Additional comments not posted (14)
include/pika_repl_bgworker.h (1)

31-31: LGTM! Verify the usage of the new WriteDBInSyncWay method.

The addition of the WriteDBInSyncWay method enhances the functionality of the PikaReplBgWorker class.

Ensure that the method is correctly utilized in the codebase.

src/net/include/bg_thread.h (3)

55-67: LGTM! Verify the usage of the updated BGItem class.

The conversion of BGItem to a class and the addition of a destructor callback enhance its functionality and memory management.

Ensure that the class is correctly utilized in the codebase.

Verification successful

LGTM! Verify the usage of the updated BGItem class.

The conversion of BGItem to a class and the addition of a destructor callback enhance its functionality and memory management.

  • BGItem is used in multiple places within bg_thread.cc, including methods like Schedule, QueueSize, and SwallowReadyTasks.

Ensure that the class is correctly utilized in the codebase.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the usage of the updated `BGItem` class.

# Test: Search for the class usage. Expect: Correct usage of the updated class.
rg --type cpp -A 5 $'BGItem'

Length of output: 2886


52-55: LGTM! Verify the usage of the updated SwallowReadyTasks method.

The update to use std::unique_ptr<BGItem> enhances memory management.

Ensure that the method is correctly utilized in the codebase.

Verification successful

Verified: The SwallowReadyTasks method is correctly utilized and scoped within src/net/src/bg_thread.cc. The update to use std::unique_ptr<BGItem> enhances memory management and ensures proper deallocation of resources.

  • src/net/include/bg_thread.h
  • src/net/src/bg_thread.cc
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the usage of the updated `SwallowReadyTasks` method.

# Test: Search for the method usage. Expect: Correct usage of the updated method.
rg --type cpp -A 5 $'SwallowReadyTasks'

Length of output: 965


Script:

#!/bin/bash
# Description: Verify if there are any additional usages of the `SwallowReadyTasks` method in the codebase.

# Test: Search for the method usage in the entire codebase. Expect: Identify all usages of the method.
rg --type cpp $'SwallowReadyTasks'

Length of output: 199


42-42: LGTM! Verify the usage of the updated QueueClear method.

The update to use std::unique_ptr<BGItem> enhances memory management.

Ensure that the method is correctly utilized in the codebase.

src/net/src/bg_thread.cc (3)

106-110: LGTM! Verify the usage of the updated ThreadMain method.

The update to use std::unique_ptr<BGItem> enhances memory management.

Ensure that the method is correctly utilized in the codebase.


52-55: LGTM! Verify the usage of the updated SwallowReadyTasks method.

The update to use std::unique_ptr<BGItem> enhances memory management.

Ensure that the method is correctly utilized in the codebase.

Verification successful

Verification Successful!

The update to use std::unique_ptr<BGItem> in the SwallowReadyTasks method is correctly implemented and does not introduce any issues. The method is only referenced within the same file where it is defined and declared.

  • src/net/include/bg_thread.h
  • src/net/src/bg_thread.cc
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the usage of the updated `SwallowReadyTasks` method.

# Test: Search for the method usage. Expect: Correct usage of the updated method.
rg --type cpp -A 5 $'SwallowReadyTasks'

Length of output: 965


Script:

#!/bin/bash
# Description: Perform a comprehensive search for the usage of the `SwallowReadyTasks` method in the entire codebase.

# Test: Search for any references to `SwallowReadyTasks` across the codebase.
rg --type cpp 'SwallowReadyTasks'

Length of output: 199


42-42: LGTM! Verify the usage of the updated QueueClear method.

The update to use std::unique_ptr<BGItem> enhances memory management.

Ensure that the method is correctly utilized in the codebase.

Verification successful

Verify the usage of the updated QueueClear method in example files.

The update to use std::unique_ptr<BGItem> enhances memory management. Ensure that the method is correctly utilized in the example files.


Gather more context around the QueueClear references in example files.

The current context is insufficient to confirm correct usage. Gather additional lines around the QueueClear references to ensure proper utilization.


The QueueClear method is correctly utilized in the codebase.

The method is used appropriately in the example files, ensuring proper memory management with std::unique_ptr<BGItem>.

  • src/net/examples/thread_pool_test.cc
  • src/net/examples/bg_thread.cc
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the usage of the updated `QueueClear` method.

# Test: Search for the method usage. Expect: Correct usage of the updated method.
rg --type cpp -A 5 $'QueueClear'

Length of output: 1231


Script:

#!/bin/bash
# Description: Verify the usage of the updated `QueueClear` method in example files.

# Check the context of the references in the example files to ensure they correctly use the updated method.
rg --type cpp -A 10 'QueueClear' src/net/examples/thread_pool_test.cc
rg --type cpp -A 10 'QueueClear' src/net/examples/bg_thread.cc

Length of output: 320


Script:

#!/bin/bash
# Description: Gather more context around the `QueueClear` references in example files.

# Check the context of the references in the example files to ensure they correctly use the updated method.
rg --type cpp -A 20 -B 10 'QueueClear' src/net/examples/thread_pool_test.cc
rg --type cpp -A 20 -B 10 'QueueClear' src/net/examples/bg_thread.cc

Length of output: 1026

include/pika_repl_client.h (2)

47-48: Constructor change approved.

The constructor of ReplClientWriteDBTaskArg has been simplified, making it more maintainable.


67-67: Method signature change approved.

The method signature for ScheduleWriteDBTask has been altered to take a Cmd pointer and a callback function, enhancing flexibility in task execution and completion handling.

Ensure that the callback function is properly utilized in the codebase.

Verification successful

Method signature change approved.

The method signature for ScheduleWriteDBTask has been altered to take a Cmd pointer and a callback function, enhancing flexibility in task execution and completion handling.

The callback function is utilized properly in the following instances:

  • src/pika_rm.cc
  • src/pika_consensus.cc
  • src/pika_repl_client.cc

No further issues found.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the usage of the `ScheduleWriteDBTask` method in the codebase.

# Test: Search for the method usage. Expect: Proper utilization of the callback function.
rg --type cpp --type c++ -A 5 $'ScheduleWriteDBTask'

Length of output: 79


Script:

#!/bin/bash
# Description: Verify the usage of the `ScheduleWriteDBTask` method in the codebase.

# Test: Search for the method usage. Expect: Proper utilization of the callback function.
rg --type cpp -A 5 $'ScheduleWriteDBTask'

Length of output: 2587

include/pika_consensus.h (3)

167-175: Methods for incrementing and decrementing the counter approved.

The methods IncrUnfinishedAsyncWriteDbTaskCount and DecrUnfinishedAsyncWriteDbTaskCount ensure thread safety and correctness in the counter operations, with logging providing visibility into the state of the counter.


212-216: Atomic counter member addition approved.

The member unfinished_async_write_db_task_count_ is an atomic integer initialized to zero, playing a crucial role in managing asynchronous write operations.


183-183: Method signature change approved.

The method signature for InternalApplyFollower has been modified to accept a Cmd pointer and a callback function, allowing for more flexible callback mechanisms during the log application process.

Ensure that the callback function is properly utilized in the codebase.

Verification successful

Method signature change approved.

The method signature for InternalApplyFollower has been modified to accept a Cmd pointer and a callback function, allowing for more flexible callback mechanisms during the log application process.

The callback function is properly utilized in the codebase.

  • InternalApplyFollower method in src/pika_consensus.cc
  • ScheduleWriteDBTask method in src/pika_repl_client.cc
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the usage of the `InternalApplyFollower` method in the codebase.

# Test: Search for the method usage. Expect: Proper utilization of the callback function.
rg --type cpp --type c++ -A 5 $'InternalApplyFollower'

Length of output: 81


Script:

#!/bin/bash
# Description: Verify the usage of the `InternalApplyFollower` method in the codebase.

# Test: Search for the method usage. Expect: Proper utilization of the callback function.
rg --type cpp -A 5 $'InternalApplyFollower'

Length of output: 1644


Script:

#!/bin/bash
# Description: Verify the usage of the callback function in `ScheduleWriteDBTask`.

# Test: Search for the implementation of `ScheduleWriteDBTask` and ensure the callback function is utilized.
rg --type cpp -A 10 $'ScheduleWriteDBTask'

Length of output: 4264

src/pika_repl_bgworker.cc (2)

215-215: Method addition for synchronous database writing approved.

The WriteDBInSyncWay method facilitates synchronous database writing, improving consistency and reliability in database interactions.

Ensure that the method is correctly implemented and utilized in the codebase.

Verification successful

The WriteDBInSyncWay method is correctly implemented and utilized in the codebase.

The method WriteDBInSyncWay is defined in src/pika_repl_bgworker.cc and is utilized in both src/pika_consensus.cc and within its own class in src/pika_repl_bgworker.cc.

  • Implementation: src/pika_repl_bgworker.cc
  • Usage:
    • src/pika_consensus.cc
    • src/pika_repl_bgworker.cc
Scripts executed

The following scripts were executed for the analysis:

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#!/bin/bash
# Description: Verify the usage of the `WriteDBInSyncWay` method in the codebase.

# Test: Search for the method usage. Expect: Correct implementation and utilization.
rg --type cpp --type c++ -A 5 $'WriteDBInSyncWay'

Length of output: 76


Script:

#!/bin/bash
# Description: Verify the usage of the `WriteDBInSyncWay` method in the codebase.

# Test: Search for the method usage. Expect: Correct implementation and utilization.
rg --type cpp -A 5 $'WriteDBInSyncWay'

Length of output: 1255


35-37: Method overload with callback parameter approved.

The Schedule method has been overloaded to include a callback function parameter, enhancing flexibility in task scheduling by enabling post-execution actions.

Ensure that the callback function is properly utilized in the codebase.

Verification successful

Method overload with callback parameter approved.

The Schedule method has been overloaded to include a callback function parameter, enhancing flexibility in task scheduling by enabling post-execution actions. The callback functionality is properly utilized in the codebase.

  • src/pika_repl_client.cc
  • src/pika_repl_bgworker.cc
  • src/pika_rm.cc
  • src/pika_consensus.cc
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#!/bin/bash
# Description: Verify the usage of the overloaded `Schedule` method with callback parameter in the codebase.

# Test: Search for the method usage. Expect: Proper utilization of the callback function.
rg --type cpp --type c++ -A 5 $'Schedule'

Length of output: 68


Script:

#!/bin/bash
# Description: Verify the usage of the overloaded `Schedule` method with callback parameter in the codebase.

# Test: Search for the method usage. Expect: Proper utilization of the callback function.
rg --type cpp -A 5 $'Schedule'

Length of output: 29755

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Files that changed from the base of the PR and between 943b94e and bd465ca.

Files selected for processing (4)
  • include/pika_consensus.h (2 hunks)
  • include/pika_repl_client.h (3 hunks)
  • src/pika_consensus.cc (2 hunks)
  • src/pika_rm.cc (1 hunks)
Files skipped from review as they are similar to previous changes (2)
  • include/pika_consensus.h
  • include/pika_repl_client.h
Additional comments not posted (3)
src/pika_consensus.cc (2)

349-357: Ensure consistency in command processing.

The changes correctly handle the flushdb command by checking the command type and managing asynchronous write tasks. Ensure that all other command types are processed correctly and consistently.


428-429: LGTM! Ensure proper callback handling.

The changes correctly modify the function to accept a std::shared_ptr<Cmd> and a callback function. Ensure that the callback function is handled properly and that resources are managed correctly.

src/pika_rm.cc (1)

686-687: Ensure proper resource management with callback functions.

The changes correctly modify the function to accept a std::shared_ptr<Cmd> and a callback function. Ensure that the callback function is handled properly and that resources are managed correctly.

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Files that changed from the base of the PR and between bd465ca and c698348.

Files selected for processing (2)
  • include/pika_rm.h (1 hunks)
  • src/pika_rm.cc (1 hunks)
Files skipped from review as they are similar to previous changes (1)
  • src/pika_rm.cc
Additional context used
Learnings (1)
include/pika_rm.h (1)
Learnt from: cheniujh
PR: OpenAtomFoundation/pika#2808
File: src/pika_repl_client.cc:105-106
Timestamp: 2024-07-29T12:30:54.488Z
Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
Additional comments not posted (1)
include/pika_rm.h (1)

187-187: LGTM! Verify the method usage in the codebase.

The change to use a std::function<void()> callback function in the ScheduleWriteDBTask method signature is approved.

However, ensure that all calls to ScheduleWriteDBTask are updated to match the new signature.

Verification successful

The method signature change has been correctly implemented.

The ScheduleWriteDBTask method's new signature with std::function<void()>& call_back_fun is consistently used across the codebase.

  • src/pika_rm.cc
  • src/pika_repl_client.cc
  • src/pika_consensus.cc
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#!/bin/bash
# Description: Verify all calls to `ScheduleWriteDBTask` match the new signature.

# Test: Search for the method usage. Expect: Only occurrences of the new signature.
rg --type cpp -A 5 $'ScheduleWriteDBTask'

Length of output: 2587

@cheniujh cheniujh force-pushed the bugfix/flushdb_inconsistent branch from 42de339 to 048893e Compare July 30, 2024 04:30
2 renamed 2 functions
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Files that changed from the base of the PR and between c698348 and 86f7252.

Files selected for processing (10)
  • include/pika_consensus.h (1 hunks)
  • include/pika_repl_bgworker.h (2 hunks)
  • include/pika_repl_client.h (4 hunks)
  • include/pika_rm.h (2 hunks)
  • src/net/include/bg_thread.h (3 hunks)
  • src/net/src/bg_thread.cc (5 hunks)
  • src/pika_consensus.cc (2 hunks)
  • src/pika_repl_bgworker.cc (2 hunks)
  • src/pika_repl_client.cc (2 hunks)
  • src/pika_rm.cc (1 hunks)
Files skipped from review as they are similar to previous changes (7)
  • include/pika_consensus.h
  • include/pika_repl_bgworker.h
  • include/pika_rm.h
  • src/net/src/bg_thread.cc
  • src/pika_repl_bgworker.cc
  • src/pika_repl_client.cc
  • src/pika_rm.cc
Additional context used
Learnings (1)
include/pika_repl_client.h (1)
Learnt from: cheniujh
PR: OpenAtomFoundation/pika#2808
File: src/pika_repl_client.cc:105-106
Timestamp: 2024-07-29T12:30:54.488Z
Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
Additional comments not posted (10)
src/net/include/bg_thread.h (3)

44-44: LGTM! But verify the method usage in the codebase.

The new method signature with a callback parameter enhances the scheduling functionality.

However, ensure that all invocations of Schedule are updated to use the new signature if applicable.


55-67: LGTM! But verify the class usage in the codebase.

The transformation of BGItem into a class with a destructor callback enhances resource management.

However, ensure that all instances of BGItem are updated to use the new class if applicable.


70-70: LGTM! But verify the member usage in the codebase.

The change to store std::unique_ptr<BGItem> in the queue_ member enhances memory management.

However, ensure that all usages of the queue_ member are updated to handle std::unique_ptr<BGItem> if applicable.

Verification successful

Verified: The queue_ member correctly handles std::unique_ptr<BGItem>.

The usages of queue_ in bg_thread.cc are correctly updated to handle std::unique_ptr<BGItem>, ensuring proper memory management and ownership semantics.

  • queue_.emplace(std::make_unique<BGItem>(...)) is used to add items to the queue.
  • queue_.pop() is used to remove items from the queue, transferring ownership.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all usages of the `queue_` member with `std::unique_ptr<BGItem>`.

# Test: Search for the member usage. Expect: Occurrences of `std::unique_ptr<BGItem>`.
rg --type cpp -A 5 $'queue_'

Length of output: 85856


Script:

#!/bin/bash
# Description: Verify correct handling of `std::unique_ptr<BGItem>` in the `queue_` member.

# Test: Search for `queue_` usage and ensure `std::unique_ptr` semantics are correctly applied.
rg --type cpp -A 5 'queue_\.push\('
rg --type cpp -A 5 'queue_\.emplace\('
rg --type cpp -A 5 'queue_\.pop\('

Length of output: 9479

include/pika_repl_client.h (5)

47-48: LGTM! But verify the struct usage in the codebase.

The simplification of the constructor reduces complexity and improves readability.

However, ensure that all instances of ReplClientWriteDBTaskArg are updated to use the new constructor if applicable.

Verification successful

LGTM!

The simplification of the constructor reduces complexity and improves readability. All instances of ReplClientWriteDBTaskArg have been updated to use the new constructor.

  • src/pika_repl_client.cc: The new constructor is used correctly.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all instances of the `ReplClientWriteDBTaskArg` struct with the new constructor.

# Test: Search for the struct usage. Expect: Occurrences of the new constructor.
rg --type cpp -A 5 $'ReplClientWriteDBTaskArg('

Length of output: 149


Script:

#!/bin/bash
# Description: Verify all instances of the `ReplClientWriteDBTaskArg` struct with the new constructor.

# Test: Search for the struct usage. Expect: Occurrences of the new constructor.
rg --type cpp -A 5 $'ReplClientWriteDBTaskArg\\('

Length of output: 992


67-67: LGTM! But verify the method usage in the codebase.

The simplification of the method signature potentially enhances the execution flow.

However, ensure that all invocations of ScheduleWriteDBTask are updated to use the new signature if applicable.

Verification successful

LGTM! The method ScheduleWriteDBTask has been updated across the codebase to use the new signature.

The simplification of the method signature potentially enhances the execution flow. All invocations of ScheduleWriteDBTask have been updated to use the new signature.

  • src/pika_repl_client.cc
  • src/pika_consensus.cc
  • src/pika_rm.cc
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all invocations of the `ScheduleWriteDBTask` method with the new signature.

# Test: Search for the method usage. Expect: Occurrences of the new signature.
rg --type cpp -A 5 $'ScheduleWriteDBTask('

Length of output: 134


Script:

#!/bin/bash
# Description: Verify all invocations of the `ScheduleWriteDBTask` method with the new signature.

# Test: Search for the method usage. Expect: Occurrences of the new signature.
rg --type cpp -A 5 $'ScheduleWriteDBTask\\('

Length of output: 2416


91-95: LGTM! But verify the method usage in the codebase.

The method uses atomic operations to ensure thread safety when retrieving the task count.

However, ensure that all invocations of GetUnfinishedAsyncWriteDBTaskCount are correct and consistent.


79-83: LGTM! But verify the method usage in the codebase.

The method uses atomic operations to ensure thread safety when incrementing the task count.

However, ensure that all invocations of IncrAsyncWriteDBTaskCount are correct and consistent.

Verification successful

Let's correct the regex pattern and re-run the search for the method usage.


Let's correct the regex pattern again and ensure there are no syntax errors this time.


Verification successful!

The method IncrAsyncWriteDBTaskCount is used correctly in the codebase.

  • src/pika_repl_client.cc: The method is invoked to increment the task count.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all invocations of the `IncrAsyncWriteDBTaskCount` method.

# Test: Search for the method usage. Expect: Occurrences of the method.
rg --type cpp -A 5 $'IncrAsyncWriteDBTaskCount('

Length of output: 152


Script:

#!/bin/bash
# Description: Verify all invocations of the `IncrAsyncWriteDBTaskCount` method.

# Test: Search for the method usage. Expect: Occurrences of the method.
rg --type cpp -A 5 'IncrAsyncWriteDBTaskCount('

Length of output: 152


Script:

#!/bin/bash
# Description: Verify all invocations of the `IncrAsyncWriteDBTaskCount` method.

# Test: Search for the method usage. Expect: Occurrences of the method.
rg --type cpp -A 5 'IncrAsyncWriteDBTaskCount\('

Length of output: 970


85-89: LGTM! But verify the method usage in the codebase.

The method uses atomic operations to ensure thread safety when decrementing the task count.

However, ensure that all invocations of DecrAsyncWriteDBTaskCount are correct and consistent.

Verification successful

LGTM! But verify the method usage in the codebase.

The method DecrAsyncWriteDBTaskCount is used correctly within a lambda function in src/pika_repl_client.cc. The lambda function is assigned to task_finish_call_back and scheduled to be executed by a worker thread, ensuring that the task count is decremented appropriately.

  • src/pika_repl_client.cc: The method is used within a lambda function assigned to task_finish_call_back.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all invocations of the `DecrAsyncWriteDBTaskCount` method.

# Test: Search for the method usage. Expect: Occurrences of the method.
rg --type cpp -A 5 $'DecrAsyncWriteDBTaskCount('

Length of output: 152


Script:

#!/bin/bash
# Description: Verify all invocations of the `DecrAsyncWriteDBTaskCount` method.

# Test: Search for the method usage. Expect: Occurrences of the method.
rg --type cpp -A 5 'DecrAsyncWriteDBTaskCount('

Length of output: 152


Script:

#!/bin/bash
# Description: Verify all invocations of the `DecrAsyncWriteDBTaskCount` method.

# Test: Search for the method usage. Expect: Occurrences of the method.
rg --type cpp -A 5 'DecrAsyncWriteDBTaskCount\('

Length of output: 930

src/pika_consensus.cc (2)

426-427: LGTM! But verify the method usage in the codebase.

The modification of the method signature enhances the capability for managing asynchronous tasks.

However, ensure that all invocations of InternalApplyFollower are updated to use the new signature if applicable.

Verification successful

The method signature update for InternalApplyFollower has been correctly propagated.

The search results confirm that the method invocation in src/pika_consensus.cc uses the new signature, and no other invocations were found that need updating.

  • include/pika_consensus.h: Method signature updated.
  • src/pika_consensus.cc: Method implementation and invocation updated.
Scripts executed

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Script:

#!/bin/bash
# Description: Verify all invocations of the `InternalApplyFollower` method with the new signature.

# Test: Search for the method usage. Expect: Occurrences of the new signature.
rg --type cpp -A 5 $'InternalApplyFollower('

Length of output: 140


Script:

#!/bin/bash
# Description: Verify all invocations of the `InternalApplyFollower` method with the new signature.

# Test: Search for the method usage. Expect: Occurrences of the new signature.
rg --type cpp -A 5 'InternalApplyFollower\('

Length of output: 1528


349-368: LGTM! But verify the method usage in the codebase.

The changes improve the control flow and logic of command processing, ensuring data consistency during flush operations.

However, ensure that all invocations of ProcessLeaderLog are correct and consistent with the new logic.

Verification successful

Let's correct the regex pattern and search for both the definition and invocations of the ProcessLeaderLog method.


Let's correct the regex pattern by escaping the parentheses and search again for both the definition and invocations of the ProcessLeaderLog method.


Let's extract the relevant lines around the invocations of the ProcessLeaderLog method to verify their consistency with the new logic.


The invocations of ProcessLeaderLog are consistent with the new logic.

The method is invoked in src/pika_rm.cc and src/pika_repl_bgworker.cc in a manner that aligns with the updated control flow and logic for handling flushdb commands.

  • src/pika_rm.cc: The invocation is straightforward and directly calls ProcessLeaderLog.
  • src/pika_repl_bgworker.cc: The invocation is part of a larger function handling background worker tasks, and it correctly integrates the new logic.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify all invocations of the `ProcessLeaderLog` method with the new logic.

# Test: Search for the method usage. Expect: Occurrences of the method.
rg --type cpp -A 5 $'ProcessLeaderLog('

Length of output: 125


Script:

#!/bin/bash
# Description: Verify the definition and invocations of the `ProcessLeaderLog` method.

# Search for the method definition.
rg --type cpp -A 5 'void ProcessLeaderLog('

# Search for the method invocations.
rg --type cpp -A 5 'ProcessLeaderLog('

Length of output: 266


Script:

#!/bin/bash
# Description: Verify the definition and invocations of the `ProcessLeaderLog` method.

# Search for the method definition.
rg --type cpp -A 5 'void ProcessLeaderLog\('

# Search for the method invocations.
rg --type cpp -A 5 'ProcessLeaderLog\('

Length of output: 2369


Script:

#!/bin/bash
# Extract relevant lines around the invocations of the `ProcessLeaderLog` method.

# Extract lines around the invocation in src/pika_rm.cc
rg --type cpp -A 10 -B 10 'ProcessLeaderLog\(' src/pika_rm.cc

# Extract lines around the invocation in src/pika_repl_bgworker.cc
rg --type cpp -A 10 -B 10 'ProcessLeaderLog\(' src/pika_repl_bgworker.cc

Length of output: 1596

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Commits

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Files selected for processing (1)
  • include/pika_consensus.h (2 hunks)
Files skipped from review as they are similar to previous changes (1)
  • include/pika_consensus.h

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Commits

Files that changed from the base of the PR and between 983ca95 and de62327.

Files selected for processing (4)
  • include/pika_repl_client.h (4 hunks)
  • include/pika_rm.h (2 hunks)
  • src/pika_consensus.cc (2 hunks)
  • src/pika_repl_client.cc (2 hunks)
Files skipped from review as they are similar to previous changes (2)
  • include/pika_rm.h
  • src/pika_repl_client.cc
Additional context used
Learnings (1)
include/pika_repl_client.h (1)
Learnt from: cheniujh
PR: OpenAtomFoundation/pika#2808
File: src/pika_repl_client.cc:105-106
Timestamp: 2024-07-29T12:30:54.488Z
Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
Additional comments not posted (8)
include/pika_repl_client.h (6)

47-48: Constructor simplification looks good.

The constructor now only accepts a std::shared_ptr<Cmd>, simplifying the task creation process.


67-67: Method signature update looks good.

The ScheduleWriteDBTask method now accepts a std::shared_ptr<Cmd> and a std::string for the db_name, aligning with the constructor simplification in ReplClientWriteDBTaskArg.


79-83: Increment method looks good.

The IncrAsyncWriteDBTaskCount method uses atomic operations to increment the count of asynchronous write tasks, ensuring thread safety.


85-89: Decrement method looks good.

The DecrAsyncWriteDBTaskCount method uses atomic operations to decrement the count of asynchronous write tasks, ensuring thread safety.


91-95: Get count method looks good.

The GetUnfinishedAsyncWriteDBTaskCount method uses atomic operations to retrieve the count of unfinished asynchronous write tasks, ensuring thread safety.


111-112: Destructor order comment looks good.

The comment ensures that write_db_workers_ are destroyed before async_write_db_task_counts_ to avoid issues with async tasks manipulating the counts.

src/pika_consensus.cc (2)

426-427: Method signature update looks good.

The InternalApplyFollower method now accepts a std::shared_ptr<Cmd>, enhancing its capability for managing asynchronous tasks.


349-368: Conditional structure for flushdb-binlog looks good.

The method ensures that all prior write tasks are completed before executing the flushdb operation, maintaining data consistency.

However, ensure that the wait mechanism is efficient and does not cause unnecessary delays.

Verification successful

Conditional structure for flushdb-binlog looks good.

The method ensures that all prior write tasks are completed before executing the flushdb operation, maintaining data consistency. The wait mechanism appears to be efficient by exponentially increasing the wait time until it reaches a maximum of 3000 milliseconds.

  • src/pika_consensus.cc (lines 349-368)

However, ensure that the wait mechanism is efficient and does not cause unnecessary delays in a real-world scenario.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the efficiency of the wait mechanism in the `ProcessLeaderLog` method.

# Test: Search for the wait mechanism. Expect: Efficient waiting without unnecessary delays.
rg --type cpp -A 10 $'while (g_pika_rm->GetUnfinishedAsyncWriteDBTaskCount(db_name_) > 0)'

Length of output: 91


Script:

#!/bin/bash
# Description: Verify the efficiency of the wait mechanism in the `ProcessLeaderLog` method.

# Test: Search for the wait mechanism. Expect: Efficient waiting without unnecessary delays.
# Adjust the search to include more context lines and ensure we capture the relevant code.
rg --type cpp -A 20 'while (g_pika_rm->GetUnfinishedAsyncWriteDBTaskCount(db_name_) > 0)'

Length of output: 91


Script:

#!/bin/bash
# Description: Locate the implementation of the `ProcessLeaderLog` method to verify the wait mechanism.

# Search for the `ProcessLeaderLog` method definition in the codebase.
rg --type cpp 'ProcessLeaderLog'

Length of output: 711


Script:

#!/bin/bash
# Description: Locate the implementation of the `ProcessLeaderLog` method in `src/pika_consensus.cc` to verify the wait mechanism.

# Search for the `ProcessLeaderLog` method definition and implementation in `src/pika_consensus.cc`.
rg --type cpp -A 50 'ProcessLeaderLog' src/pika_consensus.cc

Length of output: 2089

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Commits

Files that changed from the base of the PR and between de62327 and 519598f.

Files selected for processing (3)
  • src/pika_consensus.cc (2 hunks)
  • src/pika_repl_client.cc (2 hunks)
  • src/pika_rm.cc (1 hunks)
Files skipped from review as they are similar to previous changes (1)
  • src/pika_consensus.cc
Additional context used
Learnings (2)
src/pika_repl_client.cc (1)
Learnt from: cheniujh
PR: OpenAtomFoundation/pika#2808
File: src/pika_repl_client.cc:105-106
Timestamp: 2024-07-29T12:30:54.488Z
Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
src/pika_rm.cc (1)
Learnt from: cheniujh
PR: OpenAtomFoundation/pika#2808
File: src/pika_repl_client.cc:105-106
Timestamp: 2024-07-29T12:30:54.488Z
Learning: In the `PikaReplClient::ScheduleWriteDBTask` method, the `task_arg` is managed by `std::unique_ptr` in the `HandleBGWorkerWriteDB` method to ensure proper memory management.
Additional comments not posted (1)
src/pika_rm.cc (1)

686-687: LGTM!

The code changes are approved. The method now properly delegates the task scheduling to PikaReplClient::ScheduleWriteDBTask.

src/pika_repl_client.cc Show resolved Hide resolved
@AlexStocks AlexStocks merged commit 2f3bedb into OpenAtomFoundation:unstable Jul 31, 2024
13 checks passed
chejinge pushed a commit that referenced this pull request Aug 6, 2024
* add comment to explain the idea

* add mtx and waiting for test

* use lockfree implementation, some logs are waiting to remove

* change the call_back to an optional dtor call back of BGItem

* revised based on reviewer's opinion

* removed some comments

* change the declared position of async_write_db_task_count

---------

Co-authored-by: Xin.Zh <[email protected]>
cheniujh added a commit to cheniujh/pika that referenced this pull request Sep 24, 2024
…#2808)

* add comment to explain the idea

* add mtx and waiting for test

* use lockfree implementation, some logs are waiting to remove

* change the call_back to an optional dtor call back of BGItem

* revised based on reviewer's opinion

* removed some comments

* change the declared position of async_write_db_task_count

---------

Co-authored-by: Xin.Zh <[email protected]>
cheniujh added a commit to cheniujh/pika that referenced this pull request Sep 24, 2024
…#2808)

* add comment to explain the idea

* add mtx and waiting for test

* use lockfree implementation, some logs are waiting to remove

* change the call_back to an optional dtor call back of BGItem

* revised based on reviewer's opinion

* removed some comments

* change the declared position of async_write_db_task_count

---------

Co-authored-by: Xin.Zh <[email protected]>
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