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https://issues.apache.org/jira/browse/HIVE-2891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239778#comment-13239778
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Ashutosh Chauhan commented on HIVE-2891:
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Cool. I also learnt that hard way. Looks good. Running tests now.
> TextConverter for UDF's is inefficient if the input object is already Text or
> Lazy
> ----------------------------------------------------------------------------------
>
> Key: HIVE-2891
> URL: https://issues.apache.org/jira/browse/HIVE-2891
> Project: Hive
> Issue Type: Improvement
> Components: Serializers/Deserializers
> Affects Versions: 0.7.0, 0.7.1, 0.8.1
> Reporter: Cliff Engle
> Assignee: Cliff Engle
> Priority: Minor
> Attachments: HIVE-2891.1.patch.txt, HIVE-2891.2.patch.txt
>
>
> The TextConverter in PrimitiveObjectInspectorConverter.java is very
> inefficient if the input object is already Text or Lazy. Since it calls
> getPrimitiveJavaObject, each Text is decoded into a String and then
> re-encoded into Text. The solution is to check if preferWritable() is true,
> then call getPrimitiveWritable(input).
> To test performance, I ran the Grep query from
> https://issues.apache.org/jira/browse/HIVE-396 on a cluster of 3 ec2 large
> nodes (2 slaves 1 master) on 6GB of data. It took 21 map tasks. With the
> current 0.8.1 version, it took 81 seconds. After patching, it took 66 seconds.
> I will attach a patch and testcases.
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