Jayush Luniya created AMBARI-10067:
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Summary: ZKFailoverController failed on restart
Key: AMBARI-10067
URL: https://issues.apache.org/jira/browse/AMBARI-10067
Project: Ambari
Issue Type: Bug
Components: ambari-agent
Affects Versions: 2.0.0
Reporter: Jayush Luniya
Assignee: Jayush Luniya
Fix For: 2.0.0
Issue Summary:
1. When Namenode HA is enabled and "automatic failover" is selected, the "hdfs
zkfc -formatZK" command is used to create a znode in ZooKeeper inside of which
the automatic failover system stores its data.
2. When Namenode HA is enabled through the wizard, the user is asked to
manually run this command.
3. When Namenode HA cluster is deployed using HA blueprint, the agent script
has been executing "hdfs zkfc -formatZK -force -nonInteractive" to auto-format
the znode. This means that everytime a ZKFC starts, we end up formatting the
znode used to maintain the failover state.
Fix:
1. Changing the command to "hdfs zkfc -formatZK -nonInteractive" so that the
failover state is not reformatted and handling the case when the command
returns a status=2 to indicate that the znode already exists and hence skipping
formatting it.
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