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https://issues.apache.org/jira/browse/HIVE-11173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prasanth Jayachandran resolved HIVE-11173.
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Resolution: Fixed
Fix Version/s: llap
Committed to llap branch.
> Fair ordering of fragments in wait queue
> ----------------------------------------
>
> Key: HIVE-11173
> URL: https://issues.apache.org/jira/browse/HIVE-11173
> Project: Hive
> Issue Type: Sub-task
> Affects Versions: llap
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Fix For: llap
>
> Attachments: HIVE-11173.patch
>
>
> Wait queue ordering is currently based on the following
> 1) Finishable or not
> 2) Vertex parallelism
> 3) Attempt start time
> This ordering has issues in cases when 2 or more queries are execute in
> parallel, then all map tasks gets scheduled first even though reduce task of
> some dag are in finishable state. This will make the first submitted query
> slower even though it can proceed to completion.
> Add fair ordering to wait queue comparator to take dag submission time into
> account. For the above scenario, if we take dag submission time into account,
> the first submitted task will proceed to completion.
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