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https://issues.apache.org/jira/browse/KAFKA-7837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jun Rao resolved KAFKA-7837.
----------------------------
Resolution: Fixed
Fix Version/s: 2.2.0
Merged the PR to trunk.
> maybeShrinkIsr may not reflect OfflinePartitions immediately
> ------------------------------------------------------------
>
> Key: KAFKA-7837
> URL: https://issues.apache.org/jira/browse/KAFKA-7837
> Project: Kafka
> Issue Type: Improvement
> Reporter: Jun Rao
> Assignee: Dhruvil Shah
> Priority: Major
> Fix For: 2.2.0
>
>
> When a partition is marked offline due to a failed disk, the leader is
> supposed to not shrink its ISR any more. In ReplicaManager.maybeShrinkIsr(),
> we iterate through all non-offline partitions to shrink the ISR. If an ISR
> needs to shrink, we need to write the new ISR to ZK, which can take a bit of
> time. In this window, some partitions could now be marked as offline, but may
> not be picked up by the iterator since it only reflects the state at that
> point. This can cause all in-sync followers to be dropped out of ISR
> unnecessarily and prevents a clean leader election.
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