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https://issues.apache.org/jira/browse/HIVE-20531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sankar Hariappan reassigned HIVE-20531:
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Assignee: mahesh kumar behera (was: Sankar Hariappan)
> Repl load on cloud storage file system can skip redundant move or add
> partition tasks.
> --------------------------------------------------------------------------------------
>
> Key: HIVE-20531
> URL: https://issues.apache.org/jira/browse/HIVE-20531
> Project: Hive
> Issue Type: Sub-task
> Components: repl
> Affects Versions: 4.0.0
> Reporter: mahesh kumar behera
> Assignee: mahesh kumar behera
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Attachments: HIVE-20531.01.patch, HIVE-20531.02.patch,
> HIVE-20531.03.patch, HIVE-20531.04.patch, HIVE-20531.05.patch,
> HIVE-20531.06.patch
>
>
> In replication load, both add partition and insert operations are handled
> through import. Import creates 3 major tasks. Copy, add partition and move.
> Copy does the copy of data from source location to staging directory. Then
> add partition (which runs in parallel to copy) creates the partition in meta
> store. Its a no op in case of insert and by the time this ddl task is
> executed for insert partition would be already present. The third operation
> is move. Which actually moves the file from staging directory to actual
> location. And then in case of insert it adds the insert event to notification
> table. It does this for add partition operation which is redundant as the
> event for add partition would have been written already by ddl task. With the
> optimization to copy directly to actual table location in S3, move task can
> be avoided for add partition operation replay and replay of insert need not
> create the add partition (ddl) task.
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