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From "Ashutosh Chauhan (Assigned) (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-2891) TextConverter for UDF's is inefficient if the input object is already Text or Lazy
Date Thu, 22 Mar 2012 15:00:23 GMT

     [ https://issues.apache.org/jira/browse/HIVE-2891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashutosh Chauhan reassigned HIVE-2891:
--------------------------------------

    Assignee: Cliff Engle

Many tests fail with this patch. Simplest way to reproduce {{ant test -Dtestcase=TestContribCliDriver}}
                
> 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
>
>
> 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).getBytes().
> 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). 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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