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https://issues.apache.org/jira/browse/HBASE-14977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067273#comment-15067273
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stack commented on HBASE-14977:
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[~vrodionov] Is this causing HBASE-15024? Thanks.

> ChoreService.shutdown may result in ConcurrentModificationException
> -------------------------------------------------------------------
>
>                 Key: HBASE-14977
>                 URL: https://issues.apache.org/jira/browse/HBASE-14977
>             Project: HBase
>          Issue Type: Bug
>          Components: util
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>            Priority: Minor
>             Fix For: 2.0.0, 1.2.0, 1.3.0, 1.1.4
>
>         Attachments: HBASE-14977-add.patch, HBASE-14977-v1.patch, 
> hbase-14977_addendum2.patch, hbase-14977_addendum2.patch
>
>
> As seen in this test:
> https://builds.apache.org/job/HBase-1.3/jdk=latest1.8,label=Hadoop/425/artifact/hbase-server/target/surefire-reports/org.apache.hadoop.hbase.regionserver.compactions.TestFIFOCompactionPolicy-output.txt
> We need to make  shutdown method synchronized to avoid this issue. 



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