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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
