[HADOOP-1771] streaming hang when IOException in MROutputThread. (NPE)

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.14.1
• Fix Version/s: 0.15.0
• Assignee: Lohit Vijaya Renu
• Reporter: Koji Noguchi
• Created: 23/Aug/07 20:31
• Updated: 08/Jul/09 17:05
• Resolved: 12/Oct/07 21:08

Description

One streaming task hang and had stderr userlog as follows.

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)

In PipeMapRed.java

351       } catch (IOException io) {
352         io.printStackTrace(log_);
353         outerrThreadsThrowable = io;

I guess log_ is Null... Should call logStackTrace.