Exposed engine must include all operations below global checkpoint during rollback #36159
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…ring rollback Today we expose a new engine immediately during Lucene rollback. The new engine is started with a safe commit which might not include all acknowledged operation. With this change, we won't expose the new engine until it has recovered from the local translog. Note that this solution is not complete since it's able to reserve only acknowledged operations before the global checkpoint. This is because we replay translog up to the global checkpoint during rollback. A per-doc Lucene rollback would solve this issue entirely.
dnhatn
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Pinging @elastic/es-distributed |
ywelsch
suggested changes
Dec 6, 2018
server/src/main/java/org/elasticsearch/index/shard/IndexShard.java
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server/src/main/java/org/elasticsearch/index/shard/IndexShard.java
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@ywelsch Two very good catches. It's ready for another round. Would you please have another look? Thank you! |
s1monw
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Dec 7, 2018
server/src/main/java/org/elasticsearch/index/shard/IndexShard.java
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| synchronized (mutex) { | ||
| // we must create a new engine under mutex (see IndexShard#snapshotStoreMetadata). | ||
| newEngine = engineFactory.newReadWriteEngine(newEngineConfig()); | ||
| onNewEngine(newEngine); |
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onNewEngine does't publish the new engine right?
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onNewEngine does not expose the engine itself but exposes only the last refresh translog location to RefreshListeners.
bleskes
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Dec 7, 2018
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Thanks everyone :) |
dnhatn
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Dec 9, 2018
Today we expose a new engine immediately during Lucene rollback. The new engine is started with a safe commit which might not include all acknowledged operation. With this change, we won't expose the new engine until it has recovered from the local translog. Note that this solution is not complete since it's able to reserve only acknowledged operations before the global checkpoint. This is because we replay translog up to the global checkpoint during rollback. A per-doc Lucene rollback would solve this issue entirely. Relates #32867
jasontedor
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Dec 9, 2018
* elastic/6.x: (37 commits) [HLRC] Added support for Follow Stats API (elastic#36253) Exposed engine must have all ops below gcp during rollback (elastic#36159) TEST: Always enable soft-deletes in ShardChangesTests Use delCount of SegmentInfos to calculate numDocs (elastic#36323) Add soft-deletes upgrade tests (elastic#36286) Remove LocalCheckpointTracker#resetCheckpoint (elastic#34667) Option to use endpoints starting with _security (elastic#36379) [CCR] Restructured QA modules (elastic#36404) RestClient: on retry timeout add root exception (elastic#25576) [HLRC] Add support for put privileges API (elastic#35679) HLRC: Add rollup search (elastic#36334) Explicitly recommend to forceMerge before freezing (elastic#36376) Rename internal repository actions to be internal (elastic#36377) Core: Remove parseDefaulting from DateFormatter (elastic#36386) [ML] Prevent stack overflow while copying ML jobs and datafeeds (elastic#36370) Docs: Fix Jackson reference (elastic#36366) [ILM] Fix issue where index may not yet be in 'hot' phase (elastic#35716) Undeprecate /_watcher endpoints (elastic#36269) Docs: Fix typo in bool query (elastic#36350) HLRC: Add delete template API (elastic#36320) ...
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Today we expose a new engine immediately during Lucene rollback. The new engine is started with a safe commit which might not include all acknowledged operation. With this change, we won't expose the new engine until it has recovered from the local translog.
Note that this solution is not complete since it's able to reserve only acknowledged operations before the global checkpoint. This is because we replay translog up to the global checkpoint during rollback. A per-doc Lucene rollback would solve this issue entirely.
Relates #32867