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Posted to issues@hive.apache.org by "ZhengBowen (Jira)" <ji...@apache.org> on 2023/09/25 02:12:00 UTC

[jira] [Work started] (HIVE-25615) Hive on tez will generate at least one MapContainer per 0 length file

     [ https://issues.apache.org/jira/browse/HIVE-25615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-25615 started by ZhengBowen.
-----------------------------------------
> Hive on tez will generate at least one MapContainer per 0 length file
> ---------------------------------------------------------------------
>
>                 Key: HIVE-25615
>                 URL: https://issues.apache.org/jira/browse/HIVE-25615
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Planning, Query Processor, Tez
>    Affects Versions: 3.1.2, 4.0.0
>         Environment: hive-3.1.2
> tez-0.10.1
>            Reporter: JackYan
>            Assignee: ZhengBowen
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> When tez read a table with many partitions and those partitions contain 0 length file only, ColumnarSplitSizeEstimator will return Integer.MAX_VALUE bytes length for every 0 length file.Then,TezSplitGrouper will treat those files as big files,and generate at least one MapContainer per 0 file to handle it.This is incorrect and even wasteful.



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