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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13860) ZKFailoverController.ElectorCallbacks should have a non-trivial implementation for enterNeutralMode
Date Thu, 08 Dec 2016 00:16:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15730408#comment-15730408
] 

Karthik Kambatla commented on HADOOP-13860:
-------------------------------------------

IMO, we should implement it similar to YARN-5677. That said, I would defer the judgment to
HDFS devs. [~atm] - do you have an opinion here? 

> ZKFailoverController.ElectorCallbacks should have a non-trivial implementation for enterNeutralMode
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-13860
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13860
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Karthik Kambatla
>
> ZKFailoverController.ElectorCallbacks implements enterNeutralMode trivially. This can
lead to a master staying active for longer than necessary, unless the fencing scheme ensures
the first active is transitioned to standby before transitioning another master to active
(e.g. ssh fencing). 
> YARN-5677 does this for YARN in EmbeddedElectorService. If we choose not to implement,
we should at least document this so any user of ZKFailoverController in the future is aware.




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