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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-491) streaming jobs should allow programs that don't do any IO for a long time
Date Mon, 12 Feb 2007 18:45:06 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12472384
] 

Hadoop QA commented on HADOOP-491:
----------------------------------

+1, because http://issues.apache.org/jira/secure/attachment/12350901/HADOOP-491_20070212_3.patch
applied and successfully tested against trunk revision r505557.

> streaming jobs should allow programs that don't do any IO for a long time
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-491
>                 URL: https://issues.apache.org/jira/browse/HADOOP-491
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: contrib/streaming
>            Reporter: arkady borkovsky
>         Assigned To: Arun C Murthy
>             Fix For: 0.12.0
>
>         Attachments: HADOOP-491_20070205_1.patch, HADOOP-491_20070206_2.patch, HADOOP-491_20070212_3.patch
>
>
> The jobtracker relies on task to send heartbeats  to know the tasks are still alive.
> There is a 600 seconds timeout preset.
> hadoop streaming also uses input to or output from the program it spawns to indicate
progress, sending appropriate heartbeats.
> Some spawned programs spend longer that 600 seconds without any output while being perfectly
healthy.
> It would be good to enhance the interface between hadoop streaming and the programs it
spawns to track a healthy program in the absense of output.
> There are certain dangers with this protocol: e.g. a task can run a separate thread that
does nothing but send "i'm alive" message.   This would be a user bug to abuse the API in
such way.  

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