[GitHub] [spark] kiszk opened a new pull request #24308: [SPARK-27397[Core] Take care of OpenJ9 JVM in Spark

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kiszk opened a new pull request #24308: [SPARK-27397[Core] Take care of OpenJ9 JVM in Spark
URL: https://github.com/apache/spark/pull/24308
 
 
   ## What changes were proposed in this pull request?
   
   This PR supports `OpenJ9` in addition to `IBM JDK` and `OpenJDK` in Spark by handling `System.getProperty("java.vendor") = "Eclipse OpenJ9"`.  
   In other places where see `System.getProperty("java.vendor")`, we can leave alone.
   
   ```
   $ ~/jdk-11.0.2+9_openj9-0.12.1/bin/jshell 
   |  Welcome to JShell -- Version 11.0.2
   |  For an introduction type: /help intro
   
   jshell> System.out.println(System.getProperty("java.vendor"))
   Eclipse OpenJ9
   
   jshell> System.out.println(System.getProperty("java.vm.info"))
   JRE 11 Linux amd64-64-Bit Compressed References 20190204_127 (JIT enabled, AOT enabled)
   OpenJ9   - 90dd8cb40
   OMR      - d2f4534b
   JCL      - 289c70b6844 based on jdk-11.0.2+9
   
   jshell> System.out.println(Class.forName("com.ibm.lang.management.OperatingSystemMXBean").getDeclaredMethod("getTotalPhysicalMemory"))
   public abstract long com.ibm.lang.management.OperatingSystemMXBean.getTotalPhysicalMemory()
   
   jshell> System.out.println(Class.forName("com.sun.management.OperatingSystemMXBean").getDeclaredMethod("getTotalPhysicalMemorySize"))
   public abstract long com.sun.management.OperatingSystemMXBean.getTotalPhysicalMemorySize()
   
   jshell> System.out.println(Class.forName("com.ibm.security.auth.module.Krb5LoginModule"))
   |  Exception java.lang.ClassNotFoundException: com.ibm.security.auth.module.Krb5LoginModule
   |        at Class.forNameImpl (Native Method)
   |        at Class.forName (Class.java:339)
   |        at (#1:1)
   
   jshell> System.out.println(Class.forName("com.sun.security.auth.module.Krb5LoginModule"))
   class com.sun.security.auth.module.Krb5LoginModule
   ```
   
   ## How was this patch tested?
   
   Existing test suites

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