[jira] [Created] (SPARK-23449) Extra java options lose order in Docker context

["Andrew Korzhuev (JIRA)" <ji...@apache.org>]

Andrew Korzhuev created SPARK-23449:
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             Summary: Extra java options lose order in Docker context
                 Key: SPARK-23449
                 URL: https://issues.apache.org/jira/browse/SPARK-23449
             Project: Spark
          Issue Type: Bug
          Components: Kubernetes
    Affects Versions: 2.3.0
         Environment: Running Spark on K8S with supplied Docker image. Passing along extra java options.
            Reporter: Andrew Korzhuev
             Fix For: 2.3.0


`spark.driver.extraJavaOptions` and `spark.executor.extraJavaOptions` when processed in `entrypoint.sh`, which makes `-XX:+UnlockExperimentalVMOptions` unusable, as you have to pass it before any other experimental options.

 

Steps to reproduce:
 # Set `spark.driver.extraJavaOptions`, e.g. `-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:+CMSClassUnloadingEnabled -XX:+UseCGroupMemoryLimitForHeap`
 # Submit application to k8s cluster.
 # Fetch logs and observe that on each run order of options is different and when `-XX:+UnlockExperimentalVMOptions` is not the first startup will fail.

 

Expected behaviour:
 # Order of `extraJavaOptions` should be preserved.

 

Cause:

`entrypoint.sh` fetches environment options with `env`, which doesn't guarantee ordering.
{code:java}
env | grep SPARK_JAVA_OPT_ | sed 's/[^=]*=\(.*\)/\1/g' > /tmp/java_opts.txt{code}



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