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[SPARK-27397][Core] Take care of OpenJ9 JVM in Spark #24308

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kiszk wants to merge 3 commits into from
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[SPARK-27397][Core] Take care of OpenJ9 JVM in Spark #24308

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96bcfd4
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kiszk Apr 6, 2019
6265481
address review comment
kiszk Apr 6, 2019
08eb67a
address review comment
kiszk Apr 15, 2019
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5 changes: 3 additions & 2 deletions core/src/main/scala/org/apache/spark/util/SizeEstimator.scala
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Expand Up @@ -131,8 +131,9 @@ object SizeEstimator extends Logging {
return System.getProperty(TEST_USE_COMPRESSED_OOPS_KEY).toBoolean
}

// java.vm.info provides compressed ref info for IBM JDKs
if (System.getProperty("java.vendor").contains("IBM")) {
// java.vm.info provides compressed ref info for IBM and OpenJ9 JDKs
if (System.getProperty("java.vendor").contains("IBM") ||
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@srowen srowen Apr 6, 2019

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Nit: do you want to retrieve the value of java.vendor once here and compare it twice? the overall change seems fine, though I don't know if it means these JDKs will always work. We only test against the Oracle/OpenJDK

System.getProperty("java.vendor").contains("OpenJ9")) {
return System.getProperty("java.vm.info").contains("Compressed Ref")
}

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5 changes: 4 additions & 1 deletion launcher/src/main/java/org/apache/spark/launcher/CommandBuilderUtils.java
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Expand Up @@ -33,7 +33,7 @@ class CommandBuilderUtils {

/** The set of known JVM vendors. */
enum JavaVendor {
Oracle, IBM, OpenJDK, Unknown
Oracle, IBM, OpenJDK, OpenJ9, Unknown
}

/** Returns whether the given string is null or empty. */
Expand Down Expand Up @@ -124,6 +124,9 @@ static JavaVendor getJavaVendor() {
if (vendorString.contains("OpenJDK")) {
return JavaVendor.OpenJDK;
}
if (vendorString.contains("OpenJ9")) {
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@attilapiros attilapiros Apr 8, 2019 •
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Do you know who uses this getJavaVendor method?
As it is package private so only classes from the same package could access this.
But in the entire Spark code there is no usage for it:

$ find . -type f -exec grep "getJavaVendor" \{} \; -print
  static JavaVendor getJavaVendor() {
./launcher/src/main/java/org/apache/spark/launcher/CommandBuilderUtils.java

Could it be a 3rd party tool should use the package name: org.apache.spark.launcher?

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@srowen srowen Apr 8, 2019 •
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Hm yeah it's unused as far as I can see. It shouldn't be used by third parties anyway. Delete it?

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@attilapiros attilapiros Apr 8, 2019

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There is one more method near this one also seams to me unused: firstNonEmptyValue. Should I create a Minor PR or OK to remove within this PR?

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@attilapiros attilapiros Apr 8, 2019

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Oh and there will be the enum as well: getJavaVendor seams to me the only place where used (and mima exclude).

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@srowen srowen Apr 8, 2019

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Agree, you can delete the unused code here.
It looks like this was added to account for the fact that IBM JDKs don't have a PermGen, but Spark no longer tries to set this now that Java 8 is required and doesn't have a PermGen.

return JavaVendor.OpenJ9;
}
return JavaVendor.Unknown;
}

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