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https://issues.apache.org/jira/browse/HADOOP-8247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HADOOP-8247:
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Attachment: hadoop-8247.txt
Attached patch implements the above. Here is a transcript of its usage:
$ ./bin/hdfs haadmin -transitionToStandby nn1 -forcemanual
You have specified the forcemanual flag. This flag is dangerous, as it can
induce a split-brain scenario that WILL CORRUPT your HDFS namespace, possibly
irrecoverably.
It is recommended not to use this flag, but instead to shut down the cluster
and disable automatic failover if you prefer to manually manage your HA state.
You may abort safely by answering 'n' or hitting ^C now.
Are you sure you want to continue? (Y or N) n
12/04/10 17:05:53 FATAL ha.HAAdmin: Aborted
todd@todd-w510:~/git/hadoop-common/hadoop-dist/target/hadoop-3.0.0-SNAPSHOT$
./bemanual haadmin -transitionToStandby nn1 -force
You have specified the forcemanual flag. This flag is dangerous, as it can
induce a split-brain scenario that WILL CORRUPT your HDFS namespace, possibly
irrecoverably.
It is recommended not to use this flag, but instead to shut down the cluster
and disable automatic failover if you prefer to manually manage your HA state.
You may abort safely by answering 'n' or hitting ^C now.
Are you sure you want to continue? (Y or N) y
12/04/10 17:02:05 WARN ha.HAAdmin: Proceeding with manual HA state management
even though
automatic failover is enabled for NameNode at todd-w510/127.0.0.1:8021
> 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, hadoop-8247.txt, hadoop-8247.txt,
> hadoop-8247.txt, 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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