[jira] [Created] (KAFKA-8012) NullPointerException while truncating at high watermark can crash replica fetcher thread

["Colin Hicks (JIRA)" <ji...@apache.org>]

Colin Hicks created KAFKA-8012:
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             Summary: 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: 2.1.1, 2.2.0
            Reporter: Colin Hicks


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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