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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3068) hadoop streaming tasks hang for when stream.non.zero.exit.is.failure==true and reduce processes exit with non zero status
Date Tue, 25 Mar 2008 03:03:25 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-3068:
------------------------------------

    Fix Version/s:     (was: 0.17.0)

> 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
>
> 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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