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https://issues.apache.org/jira/browse/HBASE-29606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18021095#comment-18021095
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Umesh Kumar Kumawat commented on HBASE-29606:
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[~dustinday] can you please help me understand this ? Is it regarding Maps ? 

> NPE risk in isEmpty during concurrent reset
> -------------------------------------------
>
>                 Key: HBASE-29606
>                 URL: https://issues.apache.org/jira/browse/HBASE-29606
>             Project: HBase
>          Issue Type: Bug
>            Reporter: John Doe
>            Priority: Trivial
>
> Concurrent reset may clear the map before getting, causing null and leading 
> to a NullPointerException.



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