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https://issues.apache.org/jira/browse/HIVE-14272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Abdullah Yousufi reassigned HIVE-14272:
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Assignee: Abdullah Yousufi (was: Sergio Peña)
> ConditionalResolverMergeFiles should keep staging data on HDFS, then copy (no
> rename) to S3
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-14272
> URL: https://issues.apache.org/jira/browse/HIVE-14272
> Project: Hive
> Issue Type: Sub-task
> Reporter: Sergio Peña
> Assignee: Abdullah Yousufi
>
> If {{hive.merge.mapfiles}} is True, and the output table to write is on S3,
> then Hive will generate a conditional plan where smaller files will be merged
> into larger sizes.
> If the output files written by the initial MR job are small, then a second MR
> job is run to merge the output into larger files (a copy from S3 to S3 in the
> current code).
> If the original output files are large enough, then the conditional task is
> followed by a move/rename which is very expensive in S3.
> We should keep staging data on HDFS previous to copying them to S3 as final
> files.
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