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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5685) Non-embedded HA failover is broken
Date Wed, 28 Sep 2016 19:36:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15530642#comment-15530642

Daniel Templeton commented on YARN-5685:

The issue is more than that change from YARN-4559.  I'm still digging, but even with that
issue resolved the RMs are still all stuck in standby because the state store isn't started
until the RM transitions to active, but it doesn't transition to active unless the state store
is started.

> Non-embedded HA failover is broken
> ----------------------------------
>                 Key: YARN-5685
>                 URL: https://issues.apache.org/jira/browse/YARN-5685
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.9.0, 3.0.0-alpha1
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>            Priority: Critical
> YARN-4559 broke RM HA when embedded automatic failover is disabled.  The {{ZKRMStateStore}}
will now only start its monitoring thread when automatic failover not enabled (which is patently
useless).  I presume the intended change was to have the monitoring thread started when automatic
failover is not *embedded*.
> If HA is enabled with automatic failover enabled and embedded failover disabled, all
RMs all come up in standby state.  To make one of them active, the {{--forcemanual}} flag
must be used when manually triggering the state change.  Should the active go down, the standby
will not become active and must be manually transitioned with the {{--forcemanual}} flag.

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