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https://issues.apache.org/jira/browse/KAFKA-4674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15879553#comment-15879553
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mjuarez edited comment on KAFKA-4674 at 3/21/17 6:01 PM:
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This is happening to us in one our clusters in prod today, across multiple
topics, and basically on all nodes. The most impacted topic/partitions seem to
be the ones that have the highest volume, but every topic that has some
activity is being impacted.
Unlike [~344277...@qq.com], we are not seeing any exceptions in the logs. See
attached broker log file. Please let me know if you need more log files and/or
details.
[Update 20170321] Just wanted to clarify that this is on Kafka 0.10.0.1. We
thought we would see this fixed after upgrading to Kafka 0.10.1.1, but that one
is experiencing the same issues. At this point, we're hesitant to upgrade.
Does anybody have any idea if the fixes for 0.10.2.0 make this issue less
frequent, or maybe even eliminate it?
was (Author: mjuarez):
This is happening to us in one our clusters in prod today, across multiple
topics, and basically on all nodes. The most impacted topic/partitions seem to
be the ones that have the highest volume, but every topic that has some
activity is being impacted.
Unlike [~344277...@qq.com], we are not seeing any exceptions in the logs. See
attached broker log file. Please let me know if you need more log files and/or
details.
> Frequent ISR shrinking and expanding and disconnects among brokers
> ------------------------------------------------------------------
>
> Key: KAFKA-4674
> URL: https://issues.apache.org/jira/browse/KAFKA-4674
> Project: Kafka
> Issue Type: Bug
> Components: controller, core
> Affects Versions: 0.10.0.1
> Environment: OS: Redhat Linux 2.6.32-431.el6.x86_64
> JDK: 1.8.0_45
> Reporter: Kaiming Wan
> Attachments: controller.log.rar, kafkabroker.20170221.log.zip,
> server.log.2017-01-11-14, zookeeper.out.2017-01-11.log
>
>
> We use a kafka cluster with 3 brokers in production environment. It works
> well for several month. Recently, we get the UnderReplicatedPartitions>0
> warning mail. When we check the log, we find that the partition is always
> experience ISR shrinking and expanding. And the disconnection exception can
> be found in controller's log.
> We also found some deviant output in zookeeper's log which point to a
> consumer(using old API depends on zookeeper ) which has stopped its work with
> many lags.
> Actually, it is not the first time we encounter this problem. When we
> first met this problem, we also found the same phenomenon and the log output.
> We solve the problem by deleting the consumer node info in zookeeper. Then
> everything goes well.
> However, this time, after we deleting the consumer which already have
> large lag, the frequent ISR shrinking and expanding didn't stop for a very
> long time(serveral hours). Though, the issue didn't affect our consumer and
> producer, we think it will make our cluster unstable. So at last, we solve
> this problem by restart the controller broker.
> And now I wander what cause this problem. I check the source code and
> only know poll timeout will cause disconnection and ISR shrinking. Is the
> issue related to zookeeper because it will not hold too many metadata
> modification and make the replication fetch thread take more time?
> I upload the log file in the attachment.
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