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

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    [ https://issues.apache.org/jira/browse/KAFKA-8398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17010693#comment-17010693 ] 

ASF GitHub Bot commented on KAFKA-8398:
---------------------------------------

jaikiran commented on pull request #7387: [2.2 branch] KAFKA-8398 Prevent NPE when trying to forceUnmap
URL: https://github.com/apache/kafka/pull/7387
 
 
   
 
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> 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
>            Priority: Minor
>         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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