[HDFS-3918] EditLogTailer shouldn't log WARN when other node is in standby mode

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.3-alpha
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: ha
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 11/Sep/12 18:39
• Updated: 30/Aug/16 01:42
• Resolved: 31/Mar/15 02:48

Description

If both nodes are in standby mode, each will be trying to roll the others' logs, which results in errors like:

Unable to trigger a roll of the active NN
org.apache.hadoop.ipc.StandbyException: Operation category JOURNAL is not supported in state standby

We should catch this specific exception and not log it at WARN level, since it's expected behavior.