Hi, Version in which I observed issue: 0.90.3 + RPC timeout patch Version affected : trunk
Stack trace: 2011-11-30 13:10:26,557 [IPC Client (47) connection to inw-68.rfiserve.net/172.22.4.68:60020 from an unknown user] WARN org.apache.hadoop.ipc.HBaseClient - Unexpected exception receiving call responses java.lang.NullPointerException >-at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:583) >-at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:511) I think line number #3 here http://pastie.org/2983633 may return a null 'call'. It is so because if you rpc timeout enable, we proactively clean up other calls which have expired their lifetime along with the call for which socket timeout exception happend (refer to this method : private void cleanupCalls(long rpcTimeout)) . Please let me know if what I am thinking makes sense. -Shrijeet
