[HDFS-14030] Add query whether storage has been initialized to DN's JMXBean

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Component/s: hdfs
• Assignee: Adam Antal
• Reporter: Adam Antal
• Created: 25/Oct/18 18:02
• Updated: 02/Oct/19 17:14
• Resolved: 06/Nov/18 10:36

Description

During the short period while the DN is starting and the storage is not yet available we get the following errors:

ERROR org.apache.hadoop.jmx.JMXJsonServlet: getting attribute VolumeInfo of Hadoop:service=DataNode,name=DataNodeInfo threw an exception
javax.management.RuntimeMBeanException: java.lang.NullPointerException: Storage not yet initialized

I suggest to add an option to the DataNodeMXBean to query whether the storage has been initialized or not to surpass the exception.