[HIVE-708] Add TypedBytes SerDe for transform

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Component/s: Serializers/Deserializers
• Hadoop Flags: Reviewed
• Release Note: HIVE-708. Add TypedBytes SerDe for transform. (Namit Jain via zshao)
• Assignee: Namit Jain
• Reporter: Namit Jain
• Created: 29/Jul/09 18:53
• Updated: 17/Dec/11 00:05
• Resolved: 24/Aug/09 18:24

Description

Currently, LazySimpleSerDe is used to send data to the user transformation functions - it would be useful to let the user specify the format of the data.

Specifically, it would be very easy and useful to accommodate:

(cut and paste from Venky's mail)

Here's the typedbytes stuff that Dumbo uses.

http://issues.apache.org/jira/browse/HADOOP-1722

From:
http://static.last.fm/johan/huguk-20090414/klaas-hadoop-1722.pdf
Timings for IP count program on 300gigs of weblogs:
Java: 8 minutes
Dumbo with typed bytes: 10 minutes
Hive: 13 minutes
Dumbo without typed bytes: 16 minutes

They also have a fast python decoder for this, which is apparently 25% faster than the python version.
http://github.com/klbostee/ctypedbytes/tree/master

http://dumbotics.com/2009/05/31/dumbo-on-clouderas-distribution/

Issue Links

• is duplicated by: HIVE-669 SELECT TRANSFORM / MAP / REDUCE to support optional ROW FORMAT
• is related to: HIVE-785 Add RecordWriter for ScriptOperator
• is related to: HADOOP-1722 Make streaming to handle non-utf8 byte array
• is related to: HIVE-786 Move ql/.../ql/util/typedbytes and ql/.../ql/exec/TypedBytesRecordReader.java to contrib
• relates to: HIVE-751 Rename serde/serdeFormat etc in Hive.g for readability