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https://issues.apache.org/jira/browse/SPARK-31028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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shanyu zhao updated SPARK-31028:
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Description:
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.
was: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.
> 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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