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https://issues.apache.org/jira/browse/HBASE-13858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14949890#comment-14949890
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Fred Liu commented on HBASE-13858:
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The patch added one line to flush the output and no unit test needed.
> RS/MasterDumpServlet dumps threads before its “Stacks” header
> -------------------------------------------------------------
>
> Key: HBASE-13858
> URL: https://issues.apache.org/jira/browse/HBASE-13858
> Project: HBase
> Issue Type: Bug
> Components: master, regionserver, UI
> Affects Versions: 1.1.0
> Reporter: Lars George
> Priority: Trivial
> Labels: beginner
> Fix For: 2.0.0, 1.3.0
>
> Attachments: HBASE-13858.patch
>
>
> The stacktraces are captured using a Hadoop helper method, then its output is
> merged with the current. I presume there is a simple flush after outputing
> the "Stack" header missing, before then the caught output is dumped.
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