[jira] Commented: (HIVE-1016) Ability to access DistributedCache from UDFs

["Carl Steinbach (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-1016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904860#action_12904860 ] 

Carl Steinbach commented on HIVE-1016:
--------------------------------------

@Namit: GenericUDF.initialize() is called both at compile-time and run-time.

> Ability to access DistributedCache from UDFs
> --------------------------------------------
>
>                 Key: HIVE-1016
>                 URL: https://issues.apache.org/jira/browse/HIVE-1016
>             Project: Hadoop 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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