[Backport] Add hybridfs store type #37067
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With this commit we introduce a new store type `hybridfs` that is a hybrid between `mmapfs` and `niofs`. This store type chooses different strategies to read Lucene files based on the read access pattern (random or linear) in order to optimize performance. This store type has been available in earlier versions of Elasticsearch as `default_fs`. We have chosen a different name now in order to convey the intent of the store type instead of tying it to the fact whether it is the default choice. Relates elastic#36668
danielmitterdorfer
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>enhancement
:Distributed/Engine
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Pinging @elastic/es-distributed |
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Note to reviewers: This is identical to #36668 except that |
jpountz
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Jan 2, 2019
danielmitterdorfer
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Jan 4, 2019
With this commit we deprecate the setting `node.store.allow_mmapfs` and add a new setting `node.store.allow_mmap`. Previously this setting has controlled whether `mmapfs` could be used as a store type. With the introduction of `hybridfs` which also relies on memory-mapping the old setting name is no longer appropriate as it also applies to `hybridfs`and thus we rename it in order to convey that it is actually used to allow memory-mapping but not a specific store type. Relates #37067 Relates #37070 Relates #37095
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With this commit we introduce a new store type
hybridfsthat is ahybrid between
mmapfsandniofs. This store type chooses differentstrategies to read Lucene files based on the read access pattern (random
or linear) in order to optimize performance.
This store type has been available in earlier versions of Elasticsearch
as
default_fs. We have chosen a different name now in order to conveythe intent of the store type instead of tying it to the fact whether it
is the default choice.
Relates #36668