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From "Ivan Mitic (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10182) ZKFailoverController should implicitly ensure that ZK is formatted
Date Thu, 26 Dec 2013 21:53:52 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13857108#comment-13857108
] 

Ivan Mitic commented on HADOOP-10182:
-------------------------------------

Thanks for commenting Karthik.

bq. Formatting without an explicit request seems like a bad idea - a wrong configuration could
easily end up formatting the znode of a different cluster. At the very least, if we decide
to go this route, should have a config to disable/ enable this.
Just to clarify, when I say "format' in the context of this Jira I assume making sure that
parent ZNodes exist. If parent ZNodes exist, no action will be performed. I don't think this
can do any real damage. I will clarify this in the description of the Jira. Let me know what
you think. I don't mind adding a config, but before doing so, would like to make sure it is
really needed.

> ZKFailoverController should implicitly ensure that ZK is formatted
> ------------------------------------------------------------------
>
>                 Key: HADOOP-10182
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10182
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.3.0
>            Reporter: Ivan Mitic
>            Assignee: Ivan Mitic
>
> Currently, a manual ZK format step is necessary before ZKFailoverController can join
leader election. This generally adds overhead on what is needed to configure an HA cluster.
My proposal is to always ensure that ZK is formatted during startup of the ZKFailoverController.
If folks do not want to make this a default, we can put it under a config.



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