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https://issues.apache.org/jira/browse/HIVE-21455?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Mollitor updated HIVE-21455:
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Attachment: HIVE-21455.2.patch
> Too verbose logging in AvroGenericRecordReader
> ----------------------------------------------
>
> Key: HIVE-21455
> URL: https://issues.apache.org/jira/browse/HIVE-21455
> Project: Hive
> Issue Type: Improvement
> Components: HiveServer2
> Affects Versions: 1.2.0, 1.1.0, 2.0.0, 2.1.0, 3.0.0, 3.1.0
> Reporter: Miklos Szurap
> Assignee: David Mollitor
> Priority: Minor
> Attachments: HIVE-21455.2.patch, HIVE-21455.patch
>
>
> {{AvroGenericRecordReader}} logs the Avro schema for each datafile. It is too
> verbose, likely we don't need to log that on INFO level.
> For example a table:
> {noformat}
> create table avro_tbl (c1 string, c2 int, c3 float) stored as avro;
> {noformat}
> and querying it with a select star - with 3 datafiles HiveServer2 logs the
> following:
> {noformat}
> 2019-03-15 09:18:35,999 INFO org.apache.hadoop.mapred.FileInputFormat:
> [HiveServer2-Handler-Pool: Thread-64]: Total input paths to process : 3
> 2019-03-15 09:18:35,999 INFO
> org.apache.hadoop.hive.ql.io.avro.AvroGenericRecordReader:
> [HiveServer2-Handler-Pool: Thread-64]: Found the avro schema in the job:
> {"type":"record","name":"avro_tbl","namespace":"test","fields":[{"name":"c1","type":["null","string"],"default":null},{"name":"c2","type":["null","int"],"default":null},{"name":"c3","type":["null","float"],"default":null}]}
> 2019-03-15 09:18:36,004 INFO
> org.apache.hadoop.hive.ql.io.avro.AvroGenericRecordReader:
> [HiveServer2-Handler-Pool: Thread-64]: Found the avro schema in the job:
> {"type":"record","name":"avro_tbl","namespace":"test","fields":[{"name":"c1","type":["null","string"],"default":null},{"name":"c2","type":["null","int"],"default":null},{"name":"c3","type":["null","float"],"default":null}]}
> 2019-03-15 09:18:36,010 INFO
> org.apache.hadoop.hive.ql.io.avro.AvroGenericRecordReader:
> [HiveServer2-Handler-Pool: Thread-64]: Found the avro schema in the job:
> {"type":"record","name":"avro_tbl","namespace":"test","fields":[{"name":"c1","type":["null","string"],"default":null},{"name":"c2","type":["null","int"],"default":null},{"name":"c3","type":["null","float"],"default":null}]}
> {noformat}
> This has a huge performance and storage penalty on a table with big schema
> and thousands of datafiles.
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