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https://issues.apache.org/jira/browse/HIVE-17574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16188762#comment-16188762
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Mithun Radhakrishnan commented on HIVE-17574:
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bq. If this is only for the resources that are HDFS-based and not the ones
that are based on local files and are also present on HDFS (e.g. hive-exec)
that makes sense to me.
[~sershe], [~thejas], thank you very much for your attention. Yes, this is
indeed the case. We ran into this when we began to use up space in scratch-dirs
for copying user-libs that were already on HDFS (in their workflow/lib dirs).
bq. is it possible to add an off switch?
Yes, of course. {{hive.resource.use.hdfs.location}} is the switch. It's set to
{{true}} (i.e. "ON"), by default.
> Avoid multiple copies of HDFS-based jars when localizing job-jars
> -----------------------------------------------------------------
>
> Key: HIVE-17574
> URL: https://issues.apache.org/jira/browse/HIVE-17574
> Project: Hive
> Issue Type: Bug
> Affects Versions: 2.2.0, 3.0.0, 2.4.0
> Reporter: Mithun Radhakrishnan
> Assignee: Chris Drome
> Attachments: HIVE-17574.1-branch-2.2.patch,
> HIVE-17574.1-branch-2.patch, HIVE-17574.1.patch
>
>
> Raising this on behalf of [~selinazh]. (For my own reference: YHIVE-1035.)
> This has to do with the classpaths of Hive actions run from Oozie, and
> affects scripts that adds jars/resources from HDFS locations.
> As part of Oozie's "sharelib" deploys, foundation jars (such as Hive jars)
> tend to be stored in HDFS paths, as are any custom user-libraries used in
> workflows. An {{ADD JAR|FILE|ARCHIVE}} statement in a Hive script causes the
> following steps to occur:
> # Files are downloaded from HDFS to local temp dir.
> # UDFs are resolved/validated.
> # All jars/files, including those just downloaded from HDFS, are shipped
> right back to HDFS-based scratch-directories, for job submission.
> For HDFS-based files, this is wasteful and time-consuming. #3 above should
> skip shipping HDFS-based resources, and add those directly to the Tez session.
> We have a patch that's being used internally at Yahoo.
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