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https://issues.apache.org/jira/browse/HIVE-1016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904377#action_12904377
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HBase Review Board commented on HIVE-1016:
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Message from: "Carl Steinbach" <[email protected]>
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This is an automatically generated e-mail. To reply, visit:
http://review.cloudera.org/r/748/
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Review request for Hive Developers.
Summary
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This patch adds UDFContext, a singleton class that provides UDFs with runtime
access to the JobConf. This patch borrows heavily from PIG-1085.
This addresses bug HIVE-1016.
http://issues.apache.org/jira/browse/HIVE-1016
Diffs
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ql/src/java/org/apache/hadoop/hive/ql/exec/ExecMapper.java c257217
ql/src/java/org/apache/hadoop/hive/ql/exec/ExecReducer.java 3d7c798
ql/src/java/org/apache/hadoop/hive/ql/exec/UDFContext.java PRE-CREATION
ql/src/test/org/apache/hadoop/hive/ql/udf/UDFGetConfProp.java PRE-CREATION
ql/src/test/queries/clientpositive/udf_testcontext.q PRE-CREATION
ql/src/test/results/clientpositive/udf_testcontext.q.out PRE-CREATION
Diff: http://review.cloudera.org/r/748/diff
Testing
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Thanks,
Carl
> 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/[email protected]/msg01650.html
> http://www.mail-archive.com/[email protected]/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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