hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Koji Noguchi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3384) streaming process hang when no input to task + a large stderr debug output
Date Wed, 14 May 2008 01:45:55 GMT
streaming process hang when no input to task + a large stderr debug output
--------------------------------------------------------------------------

                 Key: HADOOP-3384
                 URL: https://issues.apache.org/jira/browse/HADOOP-3384
             Project: Hadoop Core
          Issue Type: Bug
          Components: contrib/streaming
    Affects Versions: 0.16.4
            Reporter: Koji Noguchi


We've seen streaming task hang forever, (thus hang the job), when 
1) There's no input to a mapper or a reducer
2) Streaming process writes some debug statements.
    (Either flush() or a large output  to cause a flush)

PipeMapper/Reducer waits for the streaming process to finish.
Streaming process stuck on writing to stdout/stderr.

This is due to no MROutputThread/MRErrThread being created until first input record is passed
to map() or reduce().

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message