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https://issues.apache.org/jira/browse/HIVE-24537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HIVE-24537 started by Panagiotis Garefalakis.
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> Optimise locking in LlapTaskSchedulerService
> --------------------------------------------
>
> Key: HIVE-24537
> URL: https://issues.apache.org/jira/browse/HIVE-24537
> Project: Hive
> Issue Type: Sub-task
> Components: llap
> Reporter: Rajesh Balamohan
> Assignee: Panagiotis Garefalakis
> Priority: Major
> Attachments: Screenshot 2020-12-15 at 11.41.49 AM.png
>
>
> 1. Read lock should suffice for "notifyStarted()".
> 2. Locking in "allocateTask()" can be optimised.
> 3. Optimize preemptTasks() & preemptTasksFromMap(). This would help in
> reducing the codepath with writeLock. Currently, it iterates through all
> tasks.
>
> !Screenshot 2020-12-15 at 11.41.49 AM.png|width=847,height=446!
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