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https://issues.apache.org/jira/browse/HBASE-10745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13934623#comment-13934623
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stack commented on HBASE-10745:
-------------------------------

Are all other accesses synchronized?  (I suppose they are else findbugs would 
complain).  +1

> Access ShutdownHook#fsShutdownHooks should be synchronized
> ----------------------------------------------------------
>
>                 Key: HBASE-10745
>                 URL: https://issues.apache.org/jira/browse/HBASE-10745
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>            Priority: Minor
>         Attachments: hbase-10745.patch
>
>
> Sometimes, I got weird RuntimeException. It turns out that 
> ShutdownHook#fsShutdownHooks is a HashMap. We should synchronize its access.



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