[jira] [Commented] (KAFKA-8398) NPE when unmapping files after moving log directories using AlterReplicaLogDirs

["Bill Bejeck (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-8398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211387#comment-17211387 ] 

Bill Bejeck commented on KAFKA-8398:
------------------------------------

Since this is not a blocker, and the PR is closed, I'm clearing the "fix version" field as part of the 2.7.0 release process.

> NPE when unmapping files after moving log directories using AlterReplicaLogDirs
> -------------------------------------------------------------------------------
>
>                 Key: KAFKA-8398
>                 URL: https://issues.apache.org/jira/browse/KAFKA-8398
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 2.2.0
>            Reporter: Vikas Singh
>            Assignee: Jaikiran Pai
>            Priority: Major
>             Fix For: 2.7.0
>
>         Attachments: AlterReplicaLogDirs.txt
>
>
> The NPE occurs after the AlterReplicaLogDirs command completes successfully and when unmapping older regions. The relevant part of log is in attached log file. Here is the stacktrace (which is repeated for both index files):
>  
> {code:java}
> [2019-05-20 14:08:13,999] ERROR Error unmapping index /tmp/kafka-logs/test-0.567a0d8ff88b45ab95794020d0b2e66f-delete/00000000000000000000.index (kafka.log.OffsetIndex)
> java.lang.NullPointerException
> at org.apache.kafka.common.utils.MappedByteBuffers.unmap(MappedByteBuffers.java:73)
> at kafka.log.AbstractIndex.forceUnmap(AbstractIndex.scala:318)
> at kafka.log.AbstractIndex.safeForceUnmap(AbstractIndex.scala:308)
> at kafka.log.AbstractIndex.$anonfun$closeHandler$1(AbstractIndex.scala:257)
> at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
> at kafka.utils.CoreUtils$.inLock(CoreUtils.scala:251)
> at kafka.log.AbstractIndex.closeHandler(AbstractIndex.scala:257)
> at kafka.log.AbstractIndex.deleteIfExists(AbstractIndex.scala:226)
> at kafka.log.LogSegment.$anonfun$deleteIfExists$6(LogSegment.scala:597)
> at kafka.log.LogSegment.delete$1(LogSegment.scala:585)
> at kafka.log.LogSegment.$anonfun$deleteIfExists$5(LogSegment.scala:597)
> at kafka.utils.CoreUtils$.$anonfun$tryAll$1(CoreUtils.scala:115)
> at kafka.utils.CoreUtils$.$anonfun$tryAll$1$adapted(CoreUtils.scala:114)
> at scala.collection.immutable.List.foreach(List.scala:392)
> at kafka.utils.CoreUtils$.tryAll(CoreUtils.scala:114)
> at kafka.log.LogSegment.deleteIfExists(LogSegment.scala:599)
> at kafka.log.Log.$anonfun$delete$3(Log.scala:1762)
> at kafka.log.Log.$anonfun$delete$3$adapted(Log.scala:1762)
> at scala.collection.Iterator.foreach(Iterator.scala:941)
> at scala.collection.Iterator.foreach$(Iterator.scala:941)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
> at scala.collection.IterableLike.foreach(IterableLike.scala:74)
> at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
> at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
> at kafka.log.Log.$anonfun$delete$2(Log.scala:1762)
> at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
> at kafka.log.Log.maybeHandleIOException(Log.scala:2013)
> at kafka.log.Log.delete(Log.scala:1759)
> at kafka.log.LogManager.deleteLogs(LogManager.scala:761)
> at kafka.log.LogManager.$anonfun$deleteLogs$6(LogManager.scala:775)
> at kafka.utils.KafkaScheduler.$anonfun$schedule$2(KafkaScheduler.scala:114)
> at kafka.utils.CoreUtils$$anon$1.run(CoreUtils.scala:63)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> [{code}



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