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From "Prakash Khemani (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-5013) NPE in HBaseClient$Connection.receiveResponse
Date Tue, 13 Dec 2011 16:55:30 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5013?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prakash Khemani resolved HBASE-5013.
------------------------------------

    Resolution: Duplicate

Most likely a dup of HBASE-4980
                
> NPE in HBaseClient$Connection.receiveResponse
> ---------------------------------------------
>
>                 Key: HBASE-5013
>                 URL: https://issues.apache.org/jira/browse/HBASE-5013
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Prakash Khemani
>            Assignee: Prakash Khemani
>
> We have the following NPE
> java.io.IOException: Call to hbasedev003.snc3.facebook.com/10.26.1.198:60020 failed on
local exception: java.io.IOException: Unexpected exception receiving call responses
> 	at org.apache.hadoop.hbase.ipc.HBaseClient.wrapException(HBaseClient.java:916)
> 	at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:885)
> 	at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:149)
> 	at $Proxy6.getProtocolVersion(Unknown Source)
> 	at org.apache.hadoop.hbase.ipc.WritableRpcEngine.getProxy(WritableRpcEngine.java:182)
> 	at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:295)
> 	at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:272)
> 	at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:324)
> 	at org.apache.hadoop.hbase.ipc.HBaseRPC.waitForProxy(HBaseRPC.java:228)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getHRegionConnection(HConnectionManager.java:1197)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getHRegionConnection(HConnectionManager.java:1154)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getHRegionConnection(HConnectionManager.java:1141)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:872)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:768)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.relocateRegion(HConnectionManager.java:742)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:978)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:772)
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:736)
> 	at org.apache.hadoop.hbase.client.HTable.(HTable.java:207)
> 	at org.apache.hadoop.hbase.client.HTable.(HTable.java:177)
> 	at com.facebook.BulkImporter.VerifyAssocs.(VerifyAssocs.java:248)
> 	at com.facebook.BulkImporter.VerifyAssocs$AssocVerifierMapper.setup(VerifyAssocs.java:138)
> 	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
> 	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:624)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
> 	at org.apache.hadoop.mapred.Child.main(Child.java:159)
> Caused by: java.io.IOException: Unexpected exception receiving call responses
> 	at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:494)
> Caused by: java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:571)
> 	at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:490)
> ===
> Just by looking at code the NPE shouldn't have happened
> HBaseClient$Connection.setUpIOstreams() sets up in and out.
> Then it starts the Connection thread.
> The Connection in its run method calls receiveResponse()
> In receiveResponse() NPE happens in 
>             int id = in.readInt();
> As per java.util.concurrent docs the the initialization of in should have been visible
in the Connection thread's run() method. So I don't know how in ended up being NULL.
> ===
> While looking into this issue I noticed a small problem in the closeConnection() method.
I will soon upload a diff.

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