Sylvain Veyrié created HBASE-22650:
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Summary: NPE in AssignmentManager (master crash on startup)
Key: HBASE-22650
URL: https://issues.apache.org/jira/browse/HBASE-22650
Project: HBase
Issue Type: Bug
Components: master
Affects Versions: 1.3.5, 1.2.12
Reporter: Sylvain Veyrié
Attachments: AssignmentManager-NPE.patch
On HMaster Startup:
{quote}2019-07-02 12:38:11,312 FATAL [orc3:16000.activeMasterManager]
master.HMaster: Failed to become active master
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
at
java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:964)
at
java.util.concurrent.ConcurrentHashMap$KeySetView.contains(ConcurrentHashMap.java:4558)
at
java.util.Collections$UnmodifiableCollection.contains(Collections.java:1032)
at
org.apache.hadoop.hbase.master.AssignmentManager.rebuildUserRegions(AssignmentManager.java:3094)
at
org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:495)
at
org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:830)
at org.apache.hadoop.hbase.master.HMaster.access$600(HMaster.java:202)
at org.apache.hadoop.hbase.master.HMaster$2.run(HMaster.java:1883)
at java.lang.Thread.run(Thread.java:748)
2019-07-02 12:38:11,312 FATAL [orc3:16000.activeMasterManager] master.HMaster:
Master server abort: loaded coprocessors are: []
2019-07-02 12:38:11,312 FATAL [orc3:16000.activeMasterManager] master.HMaster:
Unhandled exception. Starting shutdown.
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
at
java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:964)
at
java.util.concurrent.ConcurrentHashMap$KeySetView.contains(ConcurrentHashMap.java:4558)
at
java.util.Collections$UnmodifiableCollection.contains(Collections.java:1032)
at
org.apache.hadoop.hbase.master.AssignmentManager.rebuildUserRegions(AssignmentManager.java:3094)
at
org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:495)
at
org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:830)
at org.apache.hadoop.hbase.master.HMaster.access$600(HMaster.java:202)
at org.apache.hadoop.hbase.master.HMaster$2.run(HMaster.java:1883)
at java.lang.Thread.run(Thread.java:748)
{quote}
It happens when regionLocation is null, which may happen just above on line
3086 (or as returned by getRegionServer
We had this on 1.2.12 with the corresponding patch, but since it is not
supported anymore, did not submit it.
Attached is the patch for 1.3.5.
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