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From "Shrijeet Paliwal (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4980) Null pointer exception in HBaseClient receiveResponse
Date Thu, 08 Dec 2011 04:01:40 GMT
Null pointer exception in HBaseClient receiveResponse
-----------------------------------------------------

                 Key: HBASE-4980
                 URL: https://issues.apache.org/jira/browse/HBASE-4980
             Project: HBase
          Issue Type: Bug
          Components: client
    Affects Versions: 0.92.0
            Reporter: Shrijeet Paliwal


Relevant Stack trace: 

2011-11-30 13:10:26,557 [IPC Client (47) connection to xx.xx.xx/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)


{code}
  if (LOG.isDebugEnabled())
          LOG.debug(getName() + " got value #" + id);
        Call call = calls.remove(id);
        // Read the flag byte
        byte flag = in.readByte();
        boolean isError = ResponseFlag.isError(flag);
        if (ResponseFlag.isLength(flag)) {
          // Currently length if present is unused.
          in.readInt();
        }
        int state = in.readInt(); // Read the state.  Currently unused.
        if (isError) {
          //noinspection ThrowableInstanceNeverThrown
          call.setException(new RemoteException( WritableUtils.readString(in),
              WritableUtils.readString(in)));
        } else {
{code}

This line {code}Call call = calls.remove(id);{code}  may return a null 'call'. It is so because
if you have rpc timeout enable, we proactively clean up other calls which have expired their
lifetime along with the call for which socket timeout exception happend.

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