[AMBARI-10067] ZKFailoverController failed on restart

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.0.0
• Component/s: ambari-agent
• Assignee: Jayush Luniya
• Reporter: Jayush Luniya
• Created: 13/Mar/15 20:42
• Updated: 14/Mar/15 00:05
• Resolved: 13/Mar/15 22:32

Description

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.

Issue Links

• links to: ReviewBoard