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https://issues.apache.org/jira/browse/HBASE-11537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14066590#comment-14066590
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Andrew Purtell commented on HBASE-11537:
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Definitely synchronizing on objects out of the concurrency package is a code
smell.
> Avoid synchronization on instances of ConcurrentMap
> ---------------------------------------------------
>
> Key: HBASE-11537
> URL: https://issues.apache.org/jira/browse/HBASE-11537
> Project: HBase
> Issue Type: Bug
> Reporter: Mike Drob
> Assignee: Mike Drob
> Priority: Minor
> Labels: findbugs
> Attachments: HBASE-11537.patch, HBASE-11537.patch.txt
>
>
> In {{ProcedureCoordinator}} and {{ProcedureMember}} we synchronize on an
> instance of {{ConcurrentMap}} instead of using the interface methods for
> dealing with concurrent access.
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