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Posted to issues@hive.apache.org by "Ádám Szita (Jira)" <ji...@apache.org> on 2022/02/22 15:26:00 UTC

[jira] [Resolved] (HIVE-25967) Prevent residual expressions from getting serialized in Iceberg splits

     [ https://issues.apache.org/jira/browse/HIVE-25967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ádám Szita resolved HIVE-25967.
-------------------------------
    Resolution: Fixed

Merged into master. Thanks for reviewing [~pvary]. 

> Prevent residual expressions from getting serialized in Iceberg splits
> ----------------------------------------------------------------------
>
>                 Key: HIVE-25967
>                 URL: https://issues.apache.org/jira/browse/HIVE-25967
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Ádám Szita
>            Assignee: Ádám Szita
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> This hack removes residual expressions from the file scan task just before split serialization.
> Residuals can sometime take up too much space in the payload causing Tez AM to OOM.
> Unfortunately Tez AM doesn't distribute splits in a streamed way, that is, it serializes all splits for a job before sending them out to executors. Some residuals may take ~ 1 MB in memory, multiplied with thousands of split could kill the Tez AM JVM.
> Until the streamed split distribution is implemented we will kick residuals out of the split.



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