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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17305) Two active HBase Masters can run at the same time under certain circumstances
Date Wed, 14 Dec 2016 01:30:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15746867#comment-15746867
] 

Enis Soztutar commented on HBASE-17305:
---------------------------------------

This is interesting. Did the previous active master lose the zookeeper connection, and reconnected?
Or it is restarted? 

> 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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