Toshihiro Suzuki created HBASE-19980:
----------------------------------------

             Summary: NullPointerException when restoring a snapshot after 
splitting a region
                 Key: HBASE-19980
                 URL: https://issues.apache.org/jira/browse/HBASE-19980
             Project: HBase
          Issue Type: Bug
            Reporter: Toshihiro Suzuki


Investigating HBASE-19893, I'm facing the following NullPointerException when 
restoring a snapshot after splitting a region:
{code}
2018-02-13 01:59:56,033 ERROR [PEWorker-1] 
procedure.RestoreSnapshotProcedure(403): restore snapshot={ 
ss=snaptb1-1518454780480 
table=testRestoreSnapshotAfterSplittingRegions-1518454780480 type=FLUSH } 
failed in on-disk restore. Try re-running the restore command.
java.io.IOException
        at 
org.apache.hadoop.hbase.util.ModifyRegionUtils.editRegions(ModifyRegionUtils.java:222)
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreHdfsRegions(RestoreSnapshotHelper.java:424)
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreHdfsRegions(RestoreSnapshotHelper.java:227)
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreHdfsRegions(RestoreSnapshotHelper.java:177)
        at 
org.apache.hadoop.hbase.master.procedure.RestoreSnapshotProcedure.restoreSnapshot(RestoreSnapshotProcedure.java:395)
        at 
org.apache.hadoop.hbase.master.procedure.RestoreSnapshotProcedure.executeFromState(RestoreSnapshotProcedure.java:143)
        at 
org.apache.hadoop.hbase.master.procedure.RestoreSnapshotProcedure.executeFromState(RestoreSnapshotProcedure.java:58)
        at 
org.apache.hadoop.hbase.procedure2.StateMachineProcedure.execute(StateMachineProcedure.java:180)
        at 
org.apache.hadoop.hbase.procedure2.Procedure.doExecute(Procedure.java:845)
        at 
org.apache.hadoop.hbase.procedure2.ProcedureExecutor.execProcedure(ProcedureExecutor.java:1455)
        at 
org.apache.hadoop.hbase.procedure2.ProcedureExecutor.executeProcedure(ProcedureExecutor.java:1224)
        at 
org.apache.hadoop.hbase.procedure2.ProcedureExecutor.access$800(ProcedureExecutor.java:78)
        at 
org.apache.hadoop.hbase.procedure2.ProcedureExecutor$WorkerThread.run(ProcedureExecutor.java:1734)
Caused by: java.lang.NullPointerException
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreReferenceFile(RestoreSnapshotHelper.java:751)
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreStoreFile(RestoreSnapshotHelper.java:675)
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreRegion(RestoreSnapshotHelper.java:521)
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.restoreRegion(RestoreSnapshotHelper.java:464)
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper.access$300(RestoreSnapshotHelper.java:116)
        at 
org.apache.hadoop.hbase.snapshot.RestoreSnapshotHelper$2.editRegion(RestoreSnapshotHelper.java:427)
        at 
org.apache.hadoop.hbase.util.ModifyRegionUtils$2.call(ModifyRegionUtils.java:209)
        at 
org.apache.hadoop.hbase.util.ModifyRegionUtils$2.call(ModifyRegionUtils.java:206)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
{code}




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