[jira] [Created] (HBASE-12274) Race between RegionScannerImpl#nextInternal() and RegionScannerImpl#close() may produce null pointer exception

[Ted Yu (JIRA)]

Ted Yu created HBASE-12274:
------------------------------

             Summary: Race between RegionScannerImpl#nextInternal() and 
RegionScannerImpl#close() may produce null pointer exception
                 Key: HBASE-12274
                 URL: https://issues.apache.org/jira/browse/HBASE-12274
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.98.6.1
            Reporter: Ted Yu


I saw the following in region server log:
{code}
2014-10-15 03:28:36,976 ERROR [B.DefaultRpcServer.handler=0,queue=0,port=60020] 
ipc.RpcServer: Unexpected throwable object
java.lang.NullPointerException
  at 
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5023)
  at 
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:4932)
  at 
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:4923)
  at 
org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3245)
  at 
org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:29994)
  at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2078)
  at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:108)
  at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:114)
  at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:94)
  at java.lang.Thread.run(Thread.java:745)
{code}
This is where the NPE happened:
{code}
        // Let's see what we have in the storeHeap.
        KeyValue current = this.storeHeap.peek();
{code}
The cause was race between nextInternal(called through nextRaw) and close 
methods.
nextRaw() is not synchronized.



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