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https://issues.apache.org/jira/browse/HIVE-17814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg updated HIVE-17814:
-------------------------------
Fix Version/s: (was: 3.0.0)
3.1.0
Deferring this to 3.1.0 since the branch for 3.0.0 has been cut off. Please
update the JIRA if you would like to get your patch in 3.0.0.
> Reduce Memory footprint for large database bootstrap replication load
> ----------------------------------------------------------------------
>
> Key: HIVE-17814
> URL: https://issues.apache.org/jira/browse/HIVE-17814
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 3.0.0
> Reporter: anishek
> Assignee: anishek
> Priority: Major
> Fix For: 3.1.0
>
>
> As part of HIVE-16896 we are doing dynamic Query Task generation for
> bootstrap repl load. This was done since the number of tasks for large
> databases will generate a very large graph with hundreds of thousands of
> objects, this would put additional memory pressure on hive.
> The execution hook's however still keep reference to the query plan which
> gets dynamically modified and at the end of all task execution hive will have
> the whole DAG in memory which is what we have to prevent, Additionally for
> PostExecution Hive hooks we are additionally storing the TaskRunner objects
> for each task that is executed.
> We have to handle these issues to prevent excessive memory usage for
> replication specifically bootstrap replication.
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