JIRA [EMAIL PROTECTED] wrote:
>
> streaming hang when IOException in MROutputThread. (NPE)
> --------------------------------------------------------
>
> Key: HADOOP-1771
> URL: https://issues.apache.org/jira/browse/HADOOP-1771
> Project: Hadoop
> Issue Type: Bug
> Components: contrib/streaming
> Affects Versions: 0.13.1
> Reporter: Koji Noguchi
> Priority: Minor
> Fix For: 0.15.0
>
>
> One streaming task hang and had stderr userlog as follows.
>
> {code}
> Exception in thread "Thread-5" java.lang.NullPointerException
> at java.lang.Throwable.printStackTrace(Throwable.java:460)
> at
> org.apache.hadoop.streaming.PipeMapRed$MROutputThread.run(PipeMapRed.java:352)
> {code}
>
> In PipeMapRed.java
> {code}
> 351 } catch (IOException io) {
> 352 io.printStackTrace(log_);
> 353 outerrThreadsThrowable = io;
> {code}
>
> I guess log_ is Null... Should call logStackTrace.
>
>
>
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