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https://issues.apache.org/jira/browse/HADOOP-8247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249097#comment-13249097
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Todd Lipcon commented on HADOOP-8247:
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bq. Can we make this simpler by not supporting manual failover?
Yes. That's the current version of the patch - if you enable automatic, then
you don't get manual. But, as described in the design doc in HDFS-2185, there
are good reasons to support manually initiated failover even when the system is
set up for automatic. That will be done separately as a followup. This patch is
just meant for safety purposes.
Another advantage of this patch is that we can amend the "start-dfs.sh" script
to automatically start ZKFCs when the conf flag is present. My next rev will do
this.
> Auto-HA: add a config to enable auto-HA, which disables manual FC
> -----------------------------------------------------------------
>
> Key: HADOOP-8247
> URL: https://issues.apache.org/jira/browse/HADOOP-8247
> Project: Hadoop Common
> Issue Type: Improvement
> Components: auto-failover, ha
> Affects Versions: Auto Failover (HDFS-3042)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-8247.txt
>
>
> Currently, if automatic failover is set up and running, and the user uses the
> "haadmin -failover" command, he or she can end up putting the system in an
> inconsistent state, where the state in ZK disagrees with the actual state of
> the world. To fix this, we should add a config flag which is used to enable
> auto-HA. When this flag is set, we should disallow use of the haadmin command
> to initiate failovers. We should refuse to run ZKFCs when the flag is not
> set. Of course, this flag should be scoped by nameservice.
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