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https://issues.apache.org/jira/browse/HADOOP-10182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13857068#comment-13857068
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Karthik Kambatla commented on HADOOP-10182:
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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.
> 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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