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From "Yuri Pradkin (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3068) hadoop streaming tasks hang for when stream.non.zero.exit.is.failure==true and reduce processes exit with non zero status
Date Fri, 21 Mar 2008 20:51:24 GMT
hadoop streaming tasks hang for when stream.non.zero.exit.is.failure==true and reduce processes
exit with non zero status
-------------------------------------------------------------------------------------------------------------------------

                 Key: HADOOP-3068
                 URL: https://issues.apache.org/jira/browse/HADOOP-3068
             Project: Hadoop Core
          Issue Type: Bug
          Components: contrib/streaming
         Environment: Java(TM) SE Runtime Environment (build 1.6.0_04-b12); Hadoop version
0.17.0-dev, r639662
            Reporter: Yuri Pradkin
             Fix For: 0.17.0


When I set *stream.non.zero.exit.is.failure* to true and run a streaming job with reducers
that exit with a non-zero status, those tasks fail apparently waiting for something.

...
2008-03-21 13:33:53,715 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=65501/1/0 in:334=65501/196
[rec/s] out:0=1/196 [rec/s]
2008-03-21 13:33:53,719 INFO org.apache.hadoop.streaming.PipeMapRed: mapRedFinished
2008-03-21 13:34:11,228 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=65536/2
2008-03-21 13:34:11,235 INFO org.apache.hadoop.streaming.PipeMapRed: PipeMapRed.waitOutputThreads():
subprocess exitted with code 1
2008-03-21 13:34:11,235 INFO org.apache.hadoop.streaming.PipeMapRed: MRErrorThread done
2008-03-21 13:34:11,238 INFO org.apache.hadoop.streaming.PipeMapRed: MROutputThread done
2008-03-21 13:34:11,245 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 1
        at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:331)
        at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:475)
        at org.apache.hadoop.streaming.PipeReducer.close(PipeReducer.java:110)
        at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:399)
        at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2113)

After that the task still shows up with status:Running, but it just hangs there and when/if
all tasks get into this state, the whole cluster hangs.

BTW, may I suggest that we make *stream.non.zero.exit.is.failure* default to true after this
is fixed?

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