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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4163) If a reducer failed at shuffling stage, the task should fail, not just logging an exception
Date Mon, 06 Oct 2008 22:18:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12637277#action_12637277
] 

Chris Douglas commented on HADOOP-4163:
---------------------------------------

+1

> If a reducer failed at shuffling stage, the task should fail, not just logging an exception
> -------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4163
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4163
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.17.1
>            Reporter: Runping Qi
>            Assignee: Sharad Agarwal
>            Priority: Blocker
>             Fix For: 0.19.0
>
>         Attachments: 4163_v1.patch, 4163_v2.patch, 4163_v3.patch
>
>
> I saw a reducer stuck at the shuffling stage, with the following exception logged in
the log file:
> 2008-08-30 00:16:23,265 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
org.apache.hadoop.fs.FSError: java.io.IOException: No space left on device
> 	at org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileOutputStream.write(RawLocalFileSystem.java:199)
> 	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
> 	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
> 	at java.io.FilterOutputStream.close(FilterOutputStream.java:140)
> 	at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:59)
> 	at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:79)
> 	at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSOutputSummer.close(ChecksumFileSystem.java:332)
> 	at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:59)
> 	at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:79)
> 	at org.apache.hadoop.mapred.MapOutputLocation.getFile(MapOutputLocation.java:185)
> 	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:815)
> 	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:764)
> Caused by: java.io.IOException: No space left on device
> 	at java.io.FileOutputStream.writeBytes(Native Method)
> 	at java.io.FileOutputStream.write(FileOutputStream.java:260)
> 	at org.apache.hadoop.fs.RawLocalFileSystem$LocalFSFileOutputStream.write(RawLocalFileSystem.java:197)
> 	... 11 more
> 2008-08-30 00:16:23,320 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
> java.io.IOException: task_200808291851_0001_r_000023_0The reduce copier failed
> 	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:329)
> 	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2122)
> The task should have died.

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