[HDFS-2724] NN web UI can throw NPE after startup, before standby state is entered

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: HA branch (HDFS-1623)
• Fix Version/s: HA branch (HDFS-1623)
• Component/s: ha, namenode
• Target Version/s: HA branch (HDFS-1623)
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Aaron Myers
• Created: 27/Dec/11 06:05
• Updated: 10/Jan/12 12:53
• Resolved: 10/Jan/12 03:46

Description

There's a brief period of time (a few seconds) after the NN web server has been initialized, but before the NN's HA state is initialized. If dfshealth.jsp is hit during this time, a NullPointerException will be thrown.