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https://issues.apache.org/jira/browse/CASSANDRA-14883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16689176#comment-16689176
]
Lee Sangboo commented on CASSANDRA-14883:
-----------------------------------------
openj9 can edit executable jamm.jar and paste.
{code:java}
// MemoryLayoutSpecification.java 191 line
final String strSpecVersion = System.getProperty("java.specification.version");
final boolean hasDot = strSpecVersion.indexOf('.') != -1;
if (hasDot) {
if ("1".equals(strSpecVersion.substring(0, strSpecVersion.indexOf('.')))) {
// Java 1.6, 1.7, 1.8
final String strVmVersion = System.getProperty("java.vm.version");
System.out.println("JAMM JAVA VERSION = " + strVmVersion);
if(strVmVersion.startsWith("openj")) {
modernJvm = true;
}else {
final int vmVersion = Integer.parseInt(strVmVersion.substring(0,
strVmVersion.indexOf('.')));
modernJvm = vmVersion >= 17;
};
}
}
{code}
> Let Cassandra support the new JVM, Eclipse Openj9.
> --------------------------------------------------
>
> Key: CASSANDRA-14883
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14883
> Project: Cassandra
> Issue Type: Improvement
> Components: 4.0, Packaging
> Environment: jdk8u192-b12_openj9-0.11.0
> cassandra 4.0.0_beta_20181109_build
> Reporter: Lee Sangboo
> Priority: Major
> Fix For: 4.0.x
>
> Attachments: jamm-0.3.2.jar, jamm.zip
>
>
> Cassandra does not currently support the new JVM, Eclipse Openj9. In internal
> testing, Openj9 outperforms Hotspot. I have deployed a modified jamm library
> that has a problem with the current startup, but when I started Cassandra, I
> got a log message saying "Non-Oracle JVM detected." Some features, such as
> unimported compact SSTables, may not work as intended "If there is no
> problem, I would also like to delete the above message.
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