Add read-only Engine #33563
Add read-only Engine #33563
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This change adds an engine implementation that opens a reader on an existing index but doesn't permit any refreshes or modifications to the index. Relates to elastic#32867 Relates to elastic#32844
s1monw
added
>enhancement
v7.0.0
:Distributed/Engine
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Pinging @elastic/es-distributed |
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@dnhatn FYI I broken this out of your and my PR since they share pretty much the same functionality into it's own PR |
| @Override | ||
| public SyncedFlushResult syncFlush(String syncId, CommitId expectedCommitId) throws EngineException { | ||
| // we can't do synced flushes this would require an indexWriter which we don't have | ||
| return SyncedFlushResult.COMMIT_MISMATCH; |
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hmm... I really wonder if we are better off throwing in an exception here...
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yeah lets do that. I think we can cope with it.
| this(config, null, new TranslogStats(0, 0, 0, 0, 0), true); | ||
| } | ||
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| ReadOnlyEngine(EngineConfig config, SeqNoStats seqNoStats, TranslogStats translogStats, boolean obtainLock) { |
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java docs on obtainLock please.
| import java.util.stream.Stream; | ||
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| /** | ||
| * A basic read-only engine that allows switching a shard to be true read-only temporarily or permanently. |
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add a note that this be opened concurrently with another engine? It think that's not obvious.
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| @Override | ||
| public void rollTranslogGeneration() throws EngineException { throw new UnsupportedOperationException(); } |
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new lines missing. Also we should assert this is never called. Also no need for throws EngineException
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| @Override | ||
| public IndexResult index(Index index) { | ||
| throw new UnsupportedOperationException(); |
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we should assert this is never called (same for the other places here where UnsupportedOperationException is thrown), as this indicates a bug.
| return ElasticsearchDirectoryReader.wrap(reader, shardId); | ||
| } | ||
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| public static SeqNoStats buildSeqNoStats(SegmentInfos infos) { |
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| @Override | ||
| public Closeable acquireRetentionLockForPeerRecovery() { | ||
| return () -> {}; |
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I think this should be an assert false; + throw new UnsupportedOperationException
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it's totally fine to do a peerRecovery from this engine.
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| @Override | ||
| public void waitForOpsToComplete(long seqNo) { } |
| } | ||
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| @Override | ||
| public void refresh(String source) throws EngineException {} |
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newline, also no need to write throws EngineException
| public void refresh(String source) throws EngineException {} | ||
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| @Override | ||
| public void writeIndexingBuffer() throws EngineException {} |
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newline
also no need to write throws EngineException
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| @Override | ||
| public CommitId flush(boolean force, boolean waitIfOngoing) throws EngineException { |
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no need for throws EngineException
| public void trimOperationsFromTranslog(long belowTerm, long aboveSeqNo) throws EngineException { } | ||
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| @Override | ||
| public void maybePruneDeletes() { } |
| } | ||
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| @Override | ||
| public void trimOperationsFromTranslog(long belowTerm, long aboveSeqNo) throws EngineException { } |
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newline, no need for throws EngineException
* master: Preserve cluster settings on full restart tests (elastic#33590) Use IndexWriter.getFlushingBytes() rather than tracking it ourselves (elastic#33582) Fix upgrading of list settings (elastic#33589) Add read-only Engine (elastic#33563) HLRC: Add ML get categories API (elastic#33465) SQL: Adds MONTHNAME, DAYNAME and QUARTER functions (elastic#33411) Add predicate_token_filter (elastic#33431) Fix Replace function. Adds more tests to all string functions. (elastic#33478) [ML] Rename input_fields to column_names in file structure (elastic#33568)
* master: (91 commits) Preserve cluster settings on full restart tests (elastic#33590) Use IndexWriter.getFlushingBytes() rather than tracking it ourselves (elastic#33582) Fix upgrading of list settings (elastic#33589) Add read-only Engine (elastic#33563) HLRC: Add ML get categories API (elastic#33465) SQL: Adds MONTHNAME, DAYNAME and QUARTER functions (elastic#33411) Add predicate_token_filter (elastic#33431) Fix Replace function. Adds more tests to all string functions. (elastic#33478) [ML] Rename input_fields to column_names in file structure (elastic#33568) Add full cluster restart base class (elastic#33577) Validate list values for settings (elastic#33503) Copy and validatie soft-deletes setting on resize (elastic#33517) Test: Fix package name SQL: Fix result column names for arithmetic functions (elastic#33500) Upgrade to latest Lucene snapshot (elastic#33505) Enable not wiping cluster settings after REST test (elastic#33575) MINOR: Remove Dead Code in SearchScript (elastic#33569) [Test] Remove duplicate method in TestShardRouting (elastic#32815) mute test on windows Update beats template to include apm-server metrics (elastic#33286) ...
This change adds an engine implementation that opens a reader on an
existing index but doesn't permit any refreshes or modifications
to the index.
Relates to #32867
Relates to #32844