[HDFS-7182] JMX metrics aren't accessible when NN is busy

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.7.0, 2.6.1, 3.0.0-alpha1
• Labels: 2.6.1-candidate
• Target Version/s: 2.7.0
• Hadoop Flags: Reviewed
• Assignee: Ming Ma
• Reporter: Ming Ma
• Created: 02/Oct/14 19:01
• Updated: 30/Aug/16 01:41
• Resolved: 10/Jan/15 01:38

Description

HDFS-5693 has addressed all NN JMX metrics in hadoop 2.0.5. Since then couple new metrics have been added. It turns out "RollingUpgradeStatus" requires FSNamesystem read lock.