[jira] [Created] (HBASE-16234) Expect and handle nulls when assigning replicas

["Harsh J (JIRA)" <ji...@apache.org>]

Harsh J created HBASE-16234:
-------------------------------

             Summary: Expect and handle nulls when assigning replicas
                 Key: HBASE-16234
                 URL: https://issues.apache.org/jira/browse/HBASE-16234
             Project: HBase
          Issue Type: Bug
          Components: Region Assignment
    Affects Versions: 1.2.0
            Reporter: Harsh J


Observed this on a cluster:

{code}
FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled exception. Starting shutdown. 
java.lang.NullPointerException 
at org.apache.hadoop.hbase.master.AssignmentManager.replicaRegionsNotRecordedInMeta(AssignmentManager.java:2799) 
at org.apache.hadoop.hbase.master.AssignmentManager.assignAllUserRegions(AssignmentManager.java:2778) 
at org.apache.hadoop.hbase.master.AssignmentManager.processDeadServersAndRegionsInTransition(AssignmentManager.java:638) 
at org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:485) 
at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:723) 
at org.apache.hadoop.hbase.master.HMaster.access$500(HMaster.java:169) 
at org.apache.hadoop.hbase.master.HMaster$1.run(HMaster.java:1481) 
at java.lang.Thread.run(Thread.java:745) 
{code}

It looks like {{FSTableDescriptors#get(…)}} can be expected to return null in some cases, but {{AssignmentManager.replicaRegionsNotRecordedInMeta(…)}} does not currently have any handling for such a possibility.



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