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From "Cliff Engle (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2891) TextConverter for UDF's is inefficient if the input object is already Text or Lazy
Date Thu, 22 Mar 2012 00:29:27 GMT
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: 0.8.1, 0.7.1, 0.7.0
            Reporter: Cliff Engle
            Priority: Minor


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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