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From "Ted Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4980) Null pointer exception in HBaseClient receiveResponse
Date Thu, 08 Dec 2011 06:35:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165031#comment-13165031
] 

Ted Yu commented on HBASE-4980:
-------------------------------

Please use --no-prefix to generate patch. 
                
> 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
>              Labels: newbie
>         Attachments: 0001-HBASE-4980-Fix-NPE-in-HBaseClient-receiveResponse.patch, 0002-HBASE-4980-Fix-NPE-in-HBaseClient-receiveResponse.patch
>
>
> 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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