Mithun Radhakrishnan created HIVE-17574:
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Summary: 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: Mithun Radhakrishnan
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.
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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