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HBASE-26392 Update ClassSize.BYTE_BUFFER for JDK17 (#3784) 

Signed-off-by: Duo Zhang <zhangduo@apache.org>
This commit is contained in:
Yutong Xiao 2021-10-27 22:02:59 +08:00 committed by GitHub
parent 8e7f78cb44
commit a5a349f289
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2 changed files with 24 additions and 1 deletions
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6
hbase-common/src/main/java/org/apache/hadoop/hbase/util/ClassSize.java
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@ -257,7 +257,11 @@ public class ClassSize {
LINKEDLIST_ENTRY = align(OBJECT + (2 * REFERENCE));
//noinspection PointlessArithmeticExpression
BYTE_BUFFER = align(OBJECT + REFERENCE +
BYTE_BUFFER = JVM.getJVMSpecVersion() < 17 ?
align(OBJECT + REFERENCE +
(5 * Bytes.SIZEOF_INT) +
(3 * Bytes.SIZEOF_BOOLEAN) + Bytes.SIZEOF_LONG) + align(ARRAY) :
align(OBJECT + 2 * REFERENCE +
(5 * Bytes.SIZEOF_INT) +
(3 * Bytes.SIZEOF_BOOLEAN) + Bytes.SIZEOF_LONG) + align(ARRAY);

19
hbase-common/src/main/java/org/apache/hadoop/hbase/util/JVM.java
View File

@ -60,6 +60,21 @@ public class JVM {
private static final String JVMVersion = System.getProperty("java.version");
/**
* The raw String of java specification version.
* "1.8" for java8, "9","10"... for Java 9, 10...
*/
private static final String JVM_SPEC_VERSION_STRING =
System.getProperty("java.specification.version");
/**
* The Integer represent of JVM_SPEC_VERSION, for the JVM version comparison.
* Java 8, 9, 10 ... will be noted as 8, 9 10 ...
*/
private static final int JVM_SPEC_VERSION = JVM_SPEC_VERSION_STRING.contains(".") ?
(int) (Float.parseFloat(JVM_SPEC_VERSION_STRING) * 10 % 10) :
Integer.parseInt(JVM_SPEC_VERSION_STRING);
/**
* Constructor. Get the running Operating System instance
*/
@ -106,6 +121,10 @@ public class JVM {
return ibmvendor && JVMVersion.contains("1.6.0");
}
public static int getJVMSpecVersion() {
return JVM_SPEC_VERSION;
}
/**
* Load the implementation of UnixOperatingSystemMXBean for Oracle jvm
* and runs the desired method.