[HBASE-4866] Fix possible NPE in AssignmentManager#regionOnline

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 0.90.4
• Component/s: master
• Assignee: Unassigned
• Reporter: Jonathan Hsieh
• Created: 24/Nov/11 15:57
• Updated: 12/Jun/22 19:53
• Resolved: 11/Apr/15 00:57

Description

NPE encountered in users's HMaster logs:

11/11/22 23:45:37 FATAL master.HMaster: Unhandled exception. Starting shutdown.
java.lang.NullPointerException
   at org.apache.hadoop.hbase.master.AssignmentManager.regionOnline(AssignmentManager.java:731)
   at org.apache.hadoop.hbase.master.AssignmentManager.processFailover(AssignmentManager.java:215)
   at org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:422)
   at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:295)

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