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From "Xuefu Zhang (JIRA)" <>
Subject [jira] [Created] (HIVE-5298) AvroSerde performance problem caused by HIVE-3833
Date Mon, 16 Sep 2013 22:10:54 GMT
Xuefu Zhang created HIVE-5298:

             Summary: AvroSerde performance problem caused by HIVE-3833
                 Key: HIVE-5298
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
    Affects Versions: 0.11.0
            Reporter: Xuefu Zhang
            Assignee: Xuefu Zhang
             Fix For: 0.13.0

HIVE-3833 fixed the targeted problem and made Hive to use partition-level metadata to initialize
object inspector. In doing that, however, it goes thru every file under the table to access
the partition metadata, which is very inefficient, especially in case of multiple files per
partition. This causes more problem for AvroSerde because AvroSerde initialization accesses
schema, which is located on file system. As a result, before hive can process any data, it
needs to access every file for a table, which can take long enough to cause job failure because
of lack of job progress.

The improvement can be made so that partition metadata is only access once per partition.

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