larry-cdn77 commented on code in PR #851:
URL: https://github.com/apache/zookeeper/pull/851#discussion_r901802640
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zookeeper-server/src/main/java/org/apache/zookeeper/server/SyncRequestProcessor.java:
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@@ -139,9 +163,12 @@ public void run() {
// we do this in an attempt to ensure that not all of the servers
// in the ensemble take a snapshot at the same time
resetSnapshotStats();
+ lastFlushTime = Time.currentElapsedTime();
while (true) {
- Request si = queuedRequests.poll();
+ long pollTime = Math.min(zks.getMaxWriteQueuePollTime(),
getRemainingDelay());
+ Request si = queuedRequests.poll(pollTime,
TimeUnit.MILLISECONDS);
Review Comment:
Could this `LinkedBlockingQueue.poll` lead to a fair amount of spinning when
a non-zero `pollTime` is specified? In my use case in the order of ten thousand
transactions/sec I have seen CPU usage explode from 3-5% to 30-40%, sending my
adjoining ClickHouse cluster to its knees. I should add that total fsync time
did improve 😄
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