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Posted to issues@hive.apache.org by "ZhengBowen (Jira)" <ji...@apache.org> on 2023/09/22 11:46:00 UTC
[jira] [Updated] (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 ]
ZhengBowen updated HIVE-25615:
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Affects Version/s: 4.0.0
> 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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