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[introspection] Set the minimal query parallelism to 2 #1586

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Jun 3, 2024
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[introspection] Set the minimal query parallelism to 2 #1586

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12 changes: 9 additions & 3 deletions crates/storage-query-datafusion/src/context.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0.

use std::cmp::max;
use std::fmt::Debug;
use std::sync::Arc;

Expand Down Expand Up @@ -168,9 +169,14 @@ impl QueryContext {
// build the session
//
let mut session_config = SessionConfig::new();
if let Some(p) = default_parallelism {
session_config = session_config.with_target_partitions(p)
}

// TODO: this value affects the number of partitions created by datafusion while
// executing a query. Setting this to 1 causes the SymmetricHashJoin to fail
// which we use for some of the queries.
// Resolving this issue is tracked at https:/restatedev/restate/issues/1585
let parallelism = default_parallelism.unwrap_or(2);
session_config = session_config.with_target_partitions(max(2, parallelism));

session_config = session_config
.with_allow_symmetric_joins_without_pruning(true)
.with_information_schema(true)
Expand Down
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