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https://issues.apache.org/jira/browse/HBASE-8382?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-8382.
----------------------------------------
Resolution: Cannot Reproduce
> NPE in HBaseServer$Connection.readAndProcess
> --------------------------------------------
>
> Key: HBASE-8382
> URL: https://issues.apache.org/jira/browse/HBASE-8382
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.95.0
> Reporter: Nicolas Liochon
> Priority: Major
>
> {noformat}
> 2013-04-19 12:27:02,387 WARN [IPC Server handler 8 on 60020]
> org.apache.hadoop.ipc.HBaseServer: IPC Server handler 8 on 60020: caught a
> ClosedChannelException, this means that the server was processing a request
> but the client went away. The error message was: null
> 2013-04-19 12:27:02,865 WARN [IPC Server handler 9 on 60020]
> org.apache.hadoop.ipc.HBaseServer: (responseTooSlow):
> {"processingtimems":23963,"call":"multi(org.apache.hadoop.hbase.protobuf.generated.ClientProtos$MultiRequest)","client":"10.240.70.79:58162","starttimems":1366388798900,"queuetimems":110004,"class":"HRegionServer","responsesize":18240,"method":"multi"}
> 2013-04-19 12:28:38,675 WARN [IPC Reader 3 on port 60020]
> org.apache.hadoop.ipc.HBaseServer: IPC Server listener on 60020: count of
> bytes read: 0
> java.lang.NullPointerException
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:1504)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:803)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.doRunLoop(HBaseServer.java:596)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:571)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> 2013-04-19 12:32:00,974 DEBUG [LRU Statistics #0]
> org.apache.hadoop.hbase.io.hfile.LruBlockCache: Stats: total=10.24 MB,
> free=1.21 GB, max=1.22 GB, blocks=0, accesses=11822, hits=9, hitRatio=0.08%,
> , cachingAccesses=11, cachingHits=7, cachingHitsRatio=63.64%, , evictions=0,
> evicted=4, evictedPerRun=Infinity
> {noformat}
> Given the code, it seems that the connection is closed in parallel, changing
> the value of data in the middle of a "readAndProcess"
> I don't know if it's related, but the client failed after a few retries.
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