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Posted to common-issues@hadoop.apache.org by "Karthik Kambatla (JIRA)" <ji...@apache.org> on 2016/12/02 19:24:58 UTC

[jira] [Created] (HADOOP-13860) ZKFailoverController.ElectorCallbacks should have a non-trivial implementation for enterNeutralMode

Karthik Kambatla created HADOOP-13860:
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             Summary: ZKFailoverController.ElectorCallbacks should have a non-trivial implementation for enterNeutralMode
                 Key: HADOOP-13860
                 URL: https://issues.apache.org/jira/browse/HADOOP-13860
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Karthik Kambatla


ZKFailoverController.ElectorCallbacks implements enterNeutralMode trivially. This can lead to a master staying active for longer than necessary, unless the fencing scheme ensures the first active is transitioned to standby before transitioning another master to active (e.g. ssh fencing). 

YARN-5677 does this for YARN in EmbeddedElectorService. If we choose not to implement, we should at least document this so any user of ZKFailoverController in the future is aware. 




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