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https://issues.apache.org/jira/browse/KAFKA-8012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780256#comment-16780256
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Matthias J. Sax commented on KAFKA-8012:
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@colinhicks I added you to the list on contributors and assigned this ticket to
you. You can know self assign tickets, too.
> NullPointerException while truncating at high watermark can crash replica
> fetcher thread
> ----------------------------------------------------------------------------------------
>
> Key: KAFKA-8012
> URL: https://issues.apache.org/jira/browse/KAFKA-8012
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 2.2.0, 2.1.1
> Reporter: Colin Hicks
> Assignee: Colin Hicks
> Priority: Blocker
> Fix For: 2.2.0
>
>
> An NPE can occur when the replica fetcher manager simultaneously calls
> `removeFetcherForPartitions`, removing the corresponding partitionStates,
> while a replica fetcher thread attempts to truncate the same partition(s) in
> `truncateToHighWatermark`.
> Stack trace for failure case:
> {{java.lang.NullPointerException}}
> {{at
> kafka.server.AbstractFetcherThread.$anonfun$truncateToHighWatermark$2(AbstractFetcherThread.scala:213)}}
> {{at scala.collection.mutable.HashSet.foreach(HashSet.scala:79)}}
> {{at
> kafka.server.AbstractFetcherThread.$anonfun$truncateToHighWatermark$1(AbstractFetcherThread.scala:211)}}
> {{at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)}}
> {{at kafka.utils.CoreUtils$.inLock(CoreUtils.scala:251)}}
> {{at
> kafka.server.AbstractFetcherThread.truncateToHighWatermark(AbstractFetcherThread.scala:207)}}
> {{at
> kafka.server.AbstractFetcherThread.maybeTruncate(AbstractFetcherThread.scala:173)}}
> {{at
> kafka.server.AbstractFetcherThread.doWork(AbstractFetcherThread.scala:112)}}
> {{at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:82)}}
>
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