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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8247) Auto-HA: add a config to enable auto-HA, which disables manual FC
Date Thu, 05 Apr 2012 00:55:22 GMT
Auto-HA: add a config to enable auto-HA, which disables manual FC
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                 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


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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