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https://issues.apache.org/jira/browse/HBASE-17305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746506#comment-15746506
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Harsh J commented on HBASE-17305:
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Note that its sorta possible to simulate this by forcing a deletion of znode.
If the previous active master is pre-assignment phase, and the new active moves
to assignment after the deletion, then both end up trying to assign over the
cluster. The failure of one master only ever happens if log splitting is still
involved (thanks to HDFS' lease fencing).
> Two active HBase Masters can run at the same time under certain circumstances
> ------------------------------------------------------------------------------
>
> Key: HBASE-17305
> URL: https://issues.apache.org/jira/browse/HBASE-17305
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 2.0.0
> Reporter: Esteban Gutierrez
> Assignee: Esteban Gutierrez
> Priority: Critical
>
> This needs a little more investigation, but we found a very edgy case when
> the active master is restarted and a stand-by master tries to become active,
> however the original active master was able to become the active master again
> and just before the standby master passed the point of the transition to
> become active we ended up with two active masters running at the same time.
> Assuming the clock on both masters were accurate to milliseconds, this race
> happened in less than 85ms.
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