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Slack merge throttling params for fewer merge tasks #126016

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Merged
merged 6 commits into from
Apr 2, 2025
Merged

Slack merge throttling params for fewer merge tasks #126016

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aeea9fb
params adjust
albertzaharovits Apr 1, 2025
ea6c186
Merge branch 'main' into merge-throughput-parameter-adjust
albertzaharovits Apr 1, 2025
71da92a
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albertzaharovits Apr 1, 2025
0b538e5
[CI] Auto commit changes from spotless
Apr 1, 2025
d1aa26c
Update server/src/test/java/org/elasticsearch/index/engine/ThreadPool…
albertzaharovits Apr 2, 2025
c702fb4
Merge branch 'main' into merge-throughput-parameter-adjust
albertzaharovits Apr 2, 2025
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8 changes: 4 additions & 4 deletions server/src/main/java/org/elasticsearch/index/engine/ThreadPoolMergeExecutorService.java
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Original file line number Diff line number Diff line change
Expand Up @@ -87,8 +87,8 @@ public class ThreadPoolMergeExecutorService {
private ThreadPoolMergeExecutorService(ThreadPool threadPool) {
this.executorService = threadPool.executor(ThreadPool.Names.MERGE);
this.maxConcurrentMerges = threadPool.info(ThreadPool.Names.MERGE).getMax();
this.concurrentMergesFloorLimitForThrottling = maxConcurrentMerges * 2;
this.concurrentMergesCeilLimitForThrottling = maxConcurrentMerges * 4;
this.concurrentMergesFloorLimitForThrottling = 2;
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Can we put a comment here that this means to only decrease throttle rate when we submit a task and no other tasks are running?

this.concurrentMergesCeilLimitForThrottling = maxConcurrentMerges * 2;
}
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Perhaps assert that concurrentMergesCeilLimitForThrottling >= concurrentMergesFloorLimitForThrottling - I feel like it adds readabililty.


boolean submitMergeTask(MergeTask mergeTask) {
Expand Down Expand Up @@ -230,10 +230,10 @@ private static long newTargetIORateBytesPerSec(
);
} else if (currentlySubmittedIOThrottledMergeTasks > concurrentMergesCeilLimitForThrottling
&& currentTargetIORateBytesPerSec < MAX_IO_RATE.getBytes()) {
// increase target IO rate by 10% (capped)
// increase target IO rate by 20% (capped)
newTargetIORateBytesPerSec = Math.min(
MAX_IO_RATE.getBytes(),
currentTargetIORateBytesPerSec + currentTargetIORateBytesPerSec / 10L
currentTargetIORateBytesPerSec + currentTargetIORateBytesPerSec / 20L
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I think what you did only adds 5%, it should be:

Suggested change
currentTargetIORateBytesPerSec + currentTargetIORateBytesPerSec / 20L
currentTargetIORateBytesPerSec + currentTargetIORateBytesPerSec / 5L

?

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Thanks for catching this!

);
} else {
newTargetIORateBytesPerSec = currentTargetIORateBytesPerSec;
Expand Down