Details
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Bug
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Status: Resolved
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Major
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Resolution: Fixed
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None
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None
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None
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None
Description
The request purgatory has a funky thing where it periodically loops over all watches and purges them. If you have a fair number of partitions you can accumulate lots of watches and purging them can take a long time. During this time all expiry is halted.
Here is an example log:
[2014-05-08 21:07:41,950] INFO ExpiredRequestReaper-2 Expired request after 10ms: 5829 (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:41,952] INFO ExpiredRequestReaper-2 Expired request after 10ms: 5882 (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:41,967] INFO ExpiredRequestReaper-2 Expired request after 11ms: 5884 (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:41,968] INFO ExpiredRequestReaper-2 Purging purgatory (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:41,969] INFO ExpiredRequestReaper-2 Purged 0 requests from delay queue. (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:42,305] INFO ExpiredRequestReaper-2 Purged 340809 (watcher) requests. (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:42,305] INFO ExpiredRequestReaper-2 Expired request after 106ms: 5847 (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:42,305] INFO ExpiredRequestReaper-2 Expired request after 106ms: 5904 (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:42,328] INFO ExpiredRequestReaper-2 Expired request after 10ms: 5908 (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:42,329] INFO ExpiredRequestReaper-2 Expired request after 10ms: 5852 (kafka.server.RequestPurgatory$ExpiredRequestReaper)
[2014-05-08 21:07:42,343] INFO ExpiredRequestReaper-2 Expired request after 11ms: 5854 (kafka.server.RequestPurgatory$ExpiredRequestReaper)
Combined with our buggy purgatory request impls that can sometimes hit their expiration this can lead to huge latency spikes.
Attachments
Issue Links
- Is contained by
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KAFKA-1430 Purgatory redesign
- Resolved