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https://issues.apache.org/jira/browse/TEZ-1269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14058248#comment-14058248
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Bikas Saha commented on TEZ-1269:
---------------------------------
I made that so that the out of box experience is good but we can set a default
of 0 to be safe in small clusters without preemption.
The config values for container timeouts have changed. The new ones are
hopefully more clear. This is incompatible though but hopefully will make
upgraders notice the new feature that should end up helping them.
> TaskScheduler prematurely releases containers
> ---------------------------------------------
>
> Key: TEZ-1269
> URL: https://issues.apache.org/jira/browse/TEZ-1269
> Project: Apache Tez
> Issue Type: Bug
> Reporter: Bikas Saha
> Assignee: Bikas Saha
> Attachments: TEZ-1269.1.patch
>
>
> It checks for session mode and if not true, and if there are no outstanding
> requests, then it releases the containers before the container timeout has
> expired. If the state machine is on its way to scheduling new tasks during
> this time then they will not be able to reuse these containers.
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