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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/10/28 13:33:00 UTC

[jira] [Assigned] (SPARK-40950) isRemoteAddressMaxedOut performance overhead on scala 2.13

     [ https://issues.apache.org/jira/browse/SPARK-40950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-40950:
------------------------------------

    Assignee: Apache Spark

> isRemoteAddressMaxedOut performance overhead on scala 2.13
> ----------------------------------------------------------
>
>                 Key: SPARK-40950
>                 URL: https://issues.apache.org/jira/browse/SPARK-40950
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 3.2.2, 3.3.1
>            Reporter: Emil Ejbyfeldt
>            Assignee: Apache Spark
>            Priority: Major
>
> On scala 2.13 the blocks in FetchRequest is sometimes backed by a `List` while in 2.12 it would be ArrayBuffer. This means that calculating the length of the blocks which is done in isRemoteAddressMaxedOut and other places now much more expensive.  This is because in 2.13 `Seq` is can no longer be backed by a mutable collection.



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