Xuefu Zhang created HIVE-5298:
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Summary: AvroSerde performance problem caused by HIVE-3833
Key: HIVE-5298
URL: https://issues.apache.org/jira/browse/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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