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https://issues.apache.org/jira/browse/HIVE-1016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060979#comment-13060979
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John Sichi commented on HIVE-1016:
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Sure, no rush.
> Ability to access DistributedCache from UDFs
> --------------------------------------------
>
> Key: HIVE-1016
> URL: https://issues.apache.org/jira/browse/HIVE-1016
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Carl Steinbach
> Assignee: Carl Steinbach
> Attachments: HIVE-1016.1.patch.txt
>
>
> There have been several requests on the mailing list for
> information about how to access the DistributedCache from UDFs, e.g.:
> http://www.mail-archive.com/hive-user@hadoop.apache.org/msg01650.html
> http://www.mail-archive.com/hive-user@hadoop.apache.org/msg01926.html
> While responses to these emails suggested several workarounds, the only
> correct
> way of accessing the distributed cache is via the static methods of Hadoop's
> DistributedCache class, and all of these methods require that the JobConf be
> passed
> in as a parameter. Hence, giving UDFs access to the distributed cache
> reduces to giving UDFs access to the JobConf.
> I propose the following changes to GenericUDF/UDAF/UDTF:
> * Add an exec_init(Configuration conf) method that is called during Operator
> initialization at runtime.
> * Change the name of the "initialize" method to "compile_init" to make it
> clear that this method is called at compile-time.
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