Fill missing sequence IDs up to max sequence ID when recovering from store #24238
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…store Today we might promote a primary and recover from store where after translog recovery the local checkpoint is still behind the maximum sequence ID seen. To fill the holes in the sequence ID history this PR adds a utility method that fills up all missing sequence IDs up to the maximum seen sequence ID with no-ops.
bleskes
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Apr 21, 2017
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Looks great. I one minor request to the test.
| final long maxSeqId = seqNoService.getMaxSeqNo(); | ||
| int numNoOpsAdded = 0; | ||
| for (long i = localCheckpoint + 1; i <= maxSeqId; | ||
| // the local checkpoint might have been advanced so we are leap-frogging |
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the local checkpoint must have advanced by at least one. We can assert on that after the noop was indexed.
| Engine.Index primaryResponse = indexForDoc(doc); | ||
| Engine.IndexResult indexResult = engine.index(primaryResponse); | ||
| if (randomBoolean()) { | ||
| doc.updateSeqID(indexResult.getSeqNo(), 1); |
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why is this needed? doesn't the engine take care of that?
| assertEquals((maxSeqIDOnReplica+1) - numDocsOnReplica, recoveringEngine.fillSequenceNumberHistory(2)); | ||
| assertEquals(maxSeqIDOnReplica, recoveringEngine.seqNoService().getMaxSeqNo()); | ||
| assertEquals(maxSeqIDOnReplica, recoveringEngine.seqNoService().getLocalCheckpoint()); | ||
| if ((flushed = randomBoolean())) { |
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can we snapshot the translog and assert that the noops have the right primary term?
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ah I had that but remvoed it... good catch...
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Still LGTM. Left a suggestion for the new test.
| // start a replica shard and index the second doc | ||
| final IndexShard otherShard = newStartedShard(false); | ||
| test = otherShard.prepareIndexOnReplica( | ||
| SourceToParse.source(SourceToParse.Origin.PRIMARY, shard.shardId().getIndexName(), test.type(), test.id(), test.source(), |
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| /* This test just verifies that we fill up local checkpoint up to max seen seqID on primary recovery */ | ||
| public void testRecoverFromStoreWithNoOps() throws IOException { | ||
| final IndexShard shard = newStartedShard(true); |
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I think we can introduce a variant of indexDoc called indexDocOnReplica which takes a seq# as a parameter. This will remove the need for the extra shard. wdyt?
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I can do that in a sep PR
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Apr 23, 2017
…store (elastic#24238) Today we might promote a primary and recover from store where after translog recovery the local checkpoint is still behind the maximum sequence ID seen. To fill the holes in the sequence ID history this PR adds a utility method that fills up all missing sequence IDs up to the maximum seen sequence ID with no-ops. Relates to elastic#10708
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Today we might promote a primary and recover from store where after translog
recovery the local checkpoint is still behind the maximum sequence ID seen.
To fill the holes in the sequence ID history this PR adds a utility method
that fills up all missing sequence IDs up to the maximum seen sequence ID
with no-ops.
Relates to #10708
I still work on a test for store recovery to ensure it's called but I think it's ready for review.