[
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.
--
This message was sent by Atlassian Jira
(v8.20.1#820001)
