Add lower bound for translog generation threshold #23779
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The translog already occupies 43 bytes on disk when empty. If the translog generation threshold is below this, the flush thread can get stuck in an infinite repeatedly rolling the generation. This commit adds a lower bound on the translog generation to avoid this problem, however we keep the lower bound small for convenience in testing.
jasontedor
added
:Translog
>test
bleskes
approved these changes
Mar 28, 2017
| final Translog translog = shard.getEngine().getTranslog(); | ||
| final long generation = translog.currentFileGeneration(); | ||
| for (int i = 0; i < randomIntBetween(32, 128); i++) { | ||
| final int numberOfDocuments = randomIntBetween(32, 128); |
| * generation threshold. However, small thresholds are useful for testing so we | ||
| * do not add a large lower bound here. | ||
| */ | ||
| new ByteSizeValue(64, ByteSizeUnit.BYTES), |
Contributor
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I wonder if we should wire this to org.elasticsearch.index.translog.TranslogWriter#getHeaderLength(int) with a static constant somewhere.
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It's a good thought, and I thought about it after your suggestion. I would prefer to keep this predictable for now rather than having the minimum quietly change if we change the translog. I do not expect the header to be changing frequently, but we can revisit this if needed.
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|
to be clear - no need for another review. |
clintongormley
added
:Distributed Indexing/Distributed
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The translog already occupies 43 bytes on disk when empty. If the translog generation threshold is below this, the flush thread can get stuck in an infinite loop repeatedly rolling the generation. This commit adds a lower bound on the translog generation to avoid this problem, however we keep the lower bound small for convenience in testing.
Relates #23606