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https://issues.apache.org/jira/browse/KAFKA-4313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15587386#comment-15587386
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Jun Rao commented on KAFKA-4313:
--------------------------------
One way to fix this is that we avoid throttling those replicas in the throttled
replica list that are already in sync. Those in-sync replicas traffic will
still be accounted for the throttled traffic though.
> ISRs may thrash when replication quota is enabled
> -------------------------------------------------
>
> Key: KAFKA-4313
> URL: https://issues.apache.org/jira/browse/KAFKA-4313
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.10.1.0
> Reporter: Jun Rao
> Assignee: Jun Rao
> Fix For: 0.10.1.1
>
>
> I created a high volume topic and a low volume topic, each with 1000
> partitions and 2 replicas on 2 brokers. I populated the high volume topic
> with 4GB of data. Added a third broker and ran the rebalance tool with a
> 2MB/sec replication quota. At some point, all replicas for the low volume
> topic have been moved over and the new replicas are all in sync, but the high
> volume replicas are still catching up. Then, I started slowly producing to
> the low volume topic. Once I do that, I started seeing the low volume
> partitions' ISR constantly expanding and shrinking. The observed ISR change
> rate is ~ 6/sec. So, it does seem that ISR thrashing can happen.
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