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https://issues.apache.org/jira/browse/HIVE-14776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15497699#comment-15497699
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Szehon Ho commented on HIVE-14776:
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I'm curious about this. Distcp parallelizes the copy, and so if the file/dir
is very splittable then in theory it should be faster than single thread, even
though there's the overhead of temporary location for it? I understand for
some small files it will be slower.
And just orthogonally, I thought actually distcp puts the file in temporary
location on local file before uploading to S3, not a temporary location on S3.
> Skip 'distcp' call when copying data from HDSF to S3
> ----------------------------------------------------
>
> Key: HIVE-14776
> URL: https://issues.apache.org/jira/browse/HIVE-14776
> Project: Hive
> Issue Type: Sub-task
> Components: Hive
> Reporter: Sergio Peña
> Assignee: Sergio Peña
> Attachments: HIVE-14776.1.patch, HIVE-14776.2.patch
>
>
> Hive uses 'distcp' to copy files in parallel between HDFS encryption zones
> when the {{hive.exec.copyfile.maxsize}} threshold is lower than the file to
> copy. This 'distcp' is also executed when copying to S3, but it is causing
> slower copies.
> We should not invoke distcp when copying to blobstore systems.
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