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https://issues.apache.org/jira/browse/HIVE-25827?focusedWorklogId=783774&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-783774
]
ASF GitHub Bot logged work on HIVE-25827:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Jun/22 09:07
Start Date: 22/Jun/22 09:07
Worklog Time Spent: 10m
Work Description: szlta merged PR #3368:
URL: https://github.com/apache/hive/pull/3368
Issue Time Tracking
-------------------
Worklog Id: (was: 783774)
Time Spent: 1.5h (was: 1h 20m)
> Parquet file footer is read multiple times, when multiple splits are created
> in same file
> -----------------------------------------------------------------------------------------
>
> Key: HIVE-25827
> URL: https://issues.apache.org/jira/browse/HIVE-25827
> Project: Hive
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: Ádám Szita
> Priority: Major
> Labels: performance, pull-request-available
> Attachments: image-2021-12-21-03-19-38-577.png
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> With large files, it is possible that multiple splits are created in the same
> file. With current codebase, "ParquetRecordReaderBase" ends up reading file
> footer for each split.
> It can be optimized not to read footer information multiple times for the
> same file.
>
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/vector/VectorizedParquetRecordReader.java#L160]
>
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/ParquetRecordReaderBase.java#L91]
>
>
> !image-2021-12-21-03-19-38-577.png|width=1363,height=1256!
>
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