Add a frozen engine implementation #34357
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This change adds a `frozen` engine that allows lazily open a directory reader on a read-only shard. The engine wraps general purpose searchers in a LazyDirectoryReader that also allows to release and reset the underlying index readers after any and before secondary search phases. Relates to elastic#34352 F
s1monw
added
>enhancement
v7.0.0
:Distributed/Engine
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Pinging @elastic/es-distributed |
s1monw
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Oct 8, 2018
This change adds a high level freeze API that allows to open an index frozen and vice versa. Indices must be closed in order to become frozen and an open but frozen index must be closed to be defrosted. This change also adds a `index.frozen` setting to mark frozen indices and integrates the frozen engine with the `SearchOperationListener` that resets and releases the directory reader after and before search phases. Relates to elastic#34352 Depends on elastic#34357
s1monw
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Oct 8, 2018
`Engine.Searcher` is non-final today which makes it error prone in the case of wrapping the underlying reader or lucene `IndexSearcher` like we do in `IndexSearcherWrapper`. Yet, there is no subclass of it yet that would be dramtic to just drop on the floor. With the start of development of frozen indices this changed since in elastic#34357 functionality was added to a subclass which would be dropped if a `IndexSearcherWrapper` is installed on an index. This change locks down the `Engine.Searcher` to prevent such a functionality trap.
s1monw
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Oct 16, 2018
`Engine.Searcher` is non-final today which makes it error prone in the case of wrapping the underlying reader or lucene `IndexSearcher` like we do in `IndexSearcherWrapper`. Yet, there is no subclass of it yet that would be dramatic to just drop on the floor. With the start of development of frozen indices this changed since in #34357 functionality was added to a subclass which would be dropped if a `IndexSearcherWrapper` is installed on an index. This change locks down the `Engine.Searcher` to prevent such a functionality trap.
s1monw
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Oct 16, 2018
`Engine.Searcher` is non-final today which makes it error prone in the case of wrapping the underlying reader or lucene `IndexSearcher` like we do in `IndexSearcherWrapper`. Yet, there is no subclass of it yet that would be dramatic to just drop on the floor. With the start of development of frozen indices this changed since in #34357 functionality was added to a subclass which would be dropped if a `IndexSearcherWrapper` is installed on an index. This change locks down the `Engine.Searcher` to prevent such a functionality trap.
romseygeek
reviewed
Oct 17, 2018
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| @Override | ||
| protected DirectoryReader open(Directory directory) throws IOException { | ||
| // we fake an empty directly reader for the ReadOnlyEngine. this reader is only used |
x-pack/plugin/core/src/main/java/org/elasticsearch/index/engine/FrozenEngine.java
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good one, This will be exposed in a followup. I do have a branch for this already but I didn't want to make this change too big. The relevant code is here |
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TIL about SearchOperationListener. Nice. |
spinscale
reviewed
Oct 17, 2018
libs/core/src/main/java/org/elasticsearch/core/internal/io/IOUtils.java
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kcm
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Oct 30, 2018
`Engine.Searcher` is non-final today which makes it error prone in the case of wrapping the underlying reader or lucene `IndexSearcher` like we do in `IndexSearcherWrapper`. Yet, there is no subclass of it yet that would be dramatic to just drop on the floor. With the start of development of frozen indices this changed since in #34357 functionality was added to a subclass which would be dropped if a `IndexSearcherWrapper` is installed on an index. This change locks down the `Engine.Searcher` to prevent such a functionality trap.
bleskes
reviewed
Nov 6, 2018
x-pack/plugin/core/src/main/java/org/elasticsearch/index/engine/FrozenEngine.java
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s1monw
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Nov 10, 2018
This change adds a high level freeze API that allows to mark an index as frozen and vice versa. Indices must be closed in order to become frozen and an open but frozen index must be closed to be defrosted. This change also adds a index.frozen setting to mark frozen indices and integrates the frozen engine with the SearchOperationListener that resets and releases the directory reader after and before search phases. Relates to #34352 Depends on #34357
s1monw
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Nov 10, 2018
This change adds a special caching reader that caches all relevant values for a range query to rewrite correctly in a can_match phase without actually opening the underlying directory reader. This allows frozen indices to be filtered with can_match and in-turn searched with wildcards in a efficient way since it allows us to exclude shards that won't match based on their date-ranges without opening their directory readers. Relates to elastic#34352 Depends on elastic#34357
pgomulka
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Nov 13, 2018
This change adds a `frozen` engine that allows lazily open a directory reader on a read-only shard. The engine wraps general purpose searchers in a LazyDirectoryReader that also allows to release and reset the underlying index readers after any and before secondary search phases. Relates to elastic#34352
hendrikmuhs
pushed a commit
that referenced
this pull request
Nov 13, 2018
This change adds a special caching reader that caches all relevant values for a range query to rewrite correctly in a can_match phase without actually opening the underlying directory reader. This allows frozen indices to be filtered with can_match and in-turn searched with wildcards in a efficient way since it allows us to exclude shards that won't match based on their date-ranges without opening their directory readers. Relates to #34352 Depends on #34357
s1monw
added a commit
that referenced
this pull request
Nov 13, 2018
This change adds a special caching reader that caches all relevant values for a range query to rewrite correctly in a can_match phase without actually opening the underlying directory reader. This allows frozen indices to be filtered with can_match and in-turn searched with wildcards in a efficient way since it allows us to exclude shards that won't match based on their date-ranges without opening their directory readers. Relates to #34352 Depends on #34357
tlrx
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Mar 1, 2019
Changes were made in elastic#34357 and elastic#36467
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This change adds a
frozenengine that allows lazily open a directory readeron a read-only shard. The engine wraps general purpose searchers in a LazyDirectoryReader
that also allows to release and reset the underlying index readers after any and before
secondary search phases.
Relates to #34352