[jira] [Resolved] (SPARK-31028) Add "-XX:ActiveProcessorCount" to Spark driver and executor in Yarn mode

["Dongjoon Hyun (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-31028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun resolved SPARK-31028.
-----------------------------------
    Resolution: Invalid

Thank you for reporting, but this makes Spark fail on older JVM like the following.

{code}
$ docker run -it --rm openjdk:8u171-jre-alpine java -XX:ActiveProcessorCount=1
Unrecognized VM option 'ActiveProcessorCount=1'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
{code}

Since Apache Spark still supports Java 8u93+, I'll close this as `Invalid`.

- https://spark.apache.org/docs/3.0.0-preview2/

bq. Java 8 prior to version 8u92 support is deprecated as of Spark 3.0.0

Please try to use the existing configurations like `spark.executor.extraJavaOptions`.

> Add "-XX:ActiveProcessorCount" to Spark driver and executor in Yarn mode
> ------------------------------------------------------------------------
>
>                 Key: SPARK-31028
>                 URL: https://issues.apache.org/jira/browse/SPARK-31028
>             Project: Spark
>          Issue Type: Bug
>          Components: YARN
>    Affects Versions: 2.4.5
>            Reporter: shanyu zhao
>            Priority: Major
>
> When starting Spark driver and executors on Yarn cluster, the JVM process can discover all CPU cores on the system and set thread-pool or GC threads based on that value. We should limit what the JVM sees for the number of cores set by the user (spark.driver.cores or spark.executor.cores) by "-XX:ActiveProcessorCount", which was introduced in Java 8u191.
> Especially in running Spark on Yarn inside Kubernetes container, the number of CPU cores discovered sometimes is 1, which means it always use 1 thread in the default thread pool, or GC threads.



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