[jira] [Commented] (HADOOP-13860) ZKFailoverController.ElectorCallbacks should have a non-trivial implementation for enterNeutralMode

["Andres Perez (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-13860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15726511#comment-15726511 ] 

Andres Perez commented on HADOOP-13860:
---------------------------------------

Hi [~kasha], I would like to take care of this issue if possible. Are we more inclined to leave it as it is and document it or create the implementation? In case of the latter, should we follow a similar approach as YARN-5677 did?

> 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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