Prasanth Jayachandran created HIVE-11173:
--------------------------------------------
Summary: 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
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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
