[jira] [Created] (HADOOP-9608) ZKFC should abort if it sees an unrecognized NN become active

["Todd Lipcon (JIRA)" <ji...@apache.org>]

Todd Lipcon created HADOOP-9608:
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             Summary: ZKFC should abort if it sees an unrecognized NN become active
                 Key: HADOOP-9608
                 URL: https://issues.apache.org/jira/browse/HADOOP-9608
             Project: Hadoop Common
          Issue Type: Bug
          Components: ha
    Affects Versions: 3.0.0
            Reporter: Todd Lipcon


We recently had an issue where one NameNode and ZKFC was updated to a new configuration/IP address but the ZKFC on the other node was not rebooted. Then, next time a failover occurred, the second ZKFC was not able to become active because the data in the ActiveBreadCrumb didn't match the data in its own configuration:

{code}
org.apache.hadoop.ha.ActiveStandbyElector: Exception handling the winning of election
java.lang.IllegalArgumentException: Unable to determine service address for namenode 'XXXX'
{code}

To prevent this from happening, whenever the ZKFC sees a new NN become active, it should check that it's properly able to instantiate a ServiceTarget for it, and if not, abort (since this ZKFC wouldn't be able to handle a failover successfully)

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