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Posted to issues@spark.apache.org by "Emil Ejbyfeldt (Jira)" <ji...@apache.org> on 2022/10/28 08:54:00 UTC

[jira] [Created] (SPARK-40950) On scala 2.13 isRemoteAddressMaxedOut performance overhead

Emil Ejbyfeldt created SPARK-40950:
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             Summary: On scala 2.13 isRemoteAddressMaxedOut performance overhead
                 Key: SPARK-40950
                 URL: https://issues.apache.org/jira/browse/SPARK-40950
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 3.3.1, 3.2.2
            Reporter: Emil Ejbyfeldt


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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