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https://issues.apache.org/jira/browse/HDFS-12319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16626921#comment-16626921
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Akira Ajisaka commented on HDFS-12319:
--------------------------------------
I'm thinking this patch should be backported to branch-2.7 as well. What do you
think, [~brahmareddy]?
> DirectoryScanner will throw IllegalStateException when Multiple BP's are
> present
> --------------------------------------------------------------------------------
>
> Key: HDFS-12319
> URL: https://issues.apache.org/jira/browse/HDFS-12319
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brahma Reddy Battula
> Assignee: Brahma Reddy Battula
> Priority: Blocker
> Fix For: 2.9.0, 3.0.0-beta1, 2.8.2
>
> Attachments: HDFS-12319-001.patch, HDFS-12319-002.patch,
> TestCase_to_Reproduce.patch
>
>
> *Scenario:*
> Configure "*dfs.datanode.directoryscan.interval*" as *60* and start federated
> cluster atleast with two nameservices.
> {noformat}
> 2017-08-18 19:06:37,150
> [java.util.concurrent.ThreadPoolExecutor$Worker@37d68b4e[State = -1, empty
> queue]] ERROR datanode.DirectoryScanner
> (DirectoryScanner.java:getDiskReport(551)) - Error compiling report for the
> volume, StorageId: DS-258b5e16-caa3-48c8-a0c8-b16934eb8a0c
> java.util.concurrent.ExecutionException: java.lang.IllegalStateException:
> StopWatch is already running
> at java.util.concurrent.FutureTask.report(FutureTask.java:122)
> at java.util.concurrent.FutureTask.get(FutureTask.java:192)
> at
> org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.getDiskReport(DirectoryScanner.java:542)
> at
> org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.scan(DirectoryScanner.java:392)
> at
> org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.reconcile(DirectoryScanner.java:373)
> at
> org.apache.hadoop.hdfs.server.datanode.DirectoryScanner.run(DirectoryScanner.java:318)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.IllegalStateException: StopWatch is already running
> at org.apache.hadoop.util.StopWatch.start(StopWatch.java:49)
> at
> org.apache.hadoop.hdfs.server.datanode.DirectoryScanner$ReportCompiler.call(DirectoryScanner.java:612)
> at
> org.apache.hadoop.hdfs.server.datanode.DirectoryScanner$ReportCompiler.call(DirectoryScanner.java:579)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> ... 3 more
> {noformat}
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