[ http://issues.apache.org/jira/browse/HADOOP-133?page=all ]
Owen O'Malley updated HADOOP-133:
---------------------------------
Attachment: ping-stability.patch
Here is a patch that allows retries for communication problems on the ping from
the Task to the TaskTracker. It changes the interface of ping from returning
nothing to returning a boolean. A false return value means the child should
immediately go away. Exceptions are treated as temporary problems and given 3
chances. This patch also changes the exit code to be either 65 (asked to kill
self) or 66 (ping exception).
> the TaskTracker.Child.ping thread calls exit
> --------------------------------------------
>
> Key: HADOOP-133
> URL: http://issues.apache.org/jira/browse/HADOOP-133
> Project: Hadoop
> Type: Bug
> Components: mapred
> Versions: 0.1.1
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Attachments: ping-stability.patch
>
> The TaskTracker.Child.startPinging thread calls exit if the TaskTracker
> doesn't respond. Calling exit in a mutli-threaded program is really
> problematic. In particular, it prevents cleanup/finally clauses from running.
> We need to move to a model where it uses Thread.interrupt(), which means we
> need to check the interrupt flag in place in the map loop and reduce loop and
> stop masking the InterruptExceptions.
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