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Posted to issues@spark.apache.org by "Hongze Zhang (Jira)" <ji...@apache.org> on 2026/06/10 19:16:00 UTC

[jira] [Updated] (SPARK-54502) Support off-heap memory mode for hash relations in broadcast hash join

     [ https://issues.apache.org/jira/browse/SPARK-54502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hongze Zhang updated SPARK-54502:
---------------------------------
        Parent: SPARK-54089
    Issue Type: Sub-task  (was: Improvement)

> Support off-heap memory mode for hash relations in broadcast hash join
> ----------------------------------------------------------------------
>
>                 Key: SPARK-54502
>                 URL: https://issues.apache.org/jira/browse/SPARK-54502
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 4.0.1
>            Reporter: Hongze Zhang
>            Priority: Major
>
> Currently Spark is hard coded to use on-heap memory mode for broadcast hash join. It was because the broadcasted hash tables don't have a certain lifecycle so need to be managed by GC to avoid memory leak. Though this will cause waste of JVM heap memory when off-heap memory mode is enabled.
> This will aim to improve the design and code to add off-heap support for broadcast hash join.
>  



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