there should be a protocol for a map or reduce task to tell the jobtracker its
alive
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Key: HADOOP-491
URL: http://issues.apache.org/jira/browse/HADOOP-491
Project: Hadoop
Issue Type: New Feature
Components: mapred
Reporter: arkady borkovsky
Currently, the jobtracker relies on task to write something to the output to
know the tasks are still alive.
There is a 600 seconds timeout preset.
Some tasks spend longer that 600 seconds without any output while being
perfectly healthy.
It would be good to have an API for a task to explicitly tell the jobtracker it
is alive.
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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