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https://issues.apache.org/jira/browse/TEZ-1742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14200718#comment-14200718
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Rajesh Balamohan commented on TEZ-1742:
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>>
Map_2: 0/1 Map_3: 0/1 Map_5: 0/1000 Map_7: 0/1 Reducer_3:
0/200 Reducer_6: 0/10
>>
Job response time (without patch) : 60.996 seconds, 60.692 seconds
Job response time (with patch) : 42.953 seconds, 42.167 seconds
Patch improves job runtime performance by very good margin (Mileage would vary
based on cluster size, number of tasks in DAG etc.).
> Improve response time of internal preemption
> --------------------------------------------
>
> Key: TEZ-1742
> URL: https://issues.apache.org/jira/browse/TEZ-1742
> Project: Apache Tez
> Issue Type: Task
> Reporter: Bikas Saha
> Assignee: Bikas Saha
> Attachments: TEZ-1742.1.patch, TEZ-1742.2.patch, TEZ-1742.3.patch
>
>
> Tez YARN Task Scheduler currently preempts 1 running task at a time when a
> higher priority task is waiting and there are no available resources. When a
> large number of higher priority tasks are pending then it can take a long
> time to preempt the required number of lower priority tasks.
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