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https://issues.apache.org/jira/browse/HADOOP-491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting updated HADOOP-491:
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Resolution: Fixed
Status: Resolved (was: Patch Available)
I just committed this. Thanks Arun.
> 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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