Mirza Aliev created IGNITE-13306:
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Summary: CpuLoad metric return -1 under Java 11
Key: IGNITE-13306
URL:
https://issues.apache.org/jira/browse/IGNITE-13306 Project: Ignite
Issue Type: Bug
Affects Versions: 2.8.1
Reporter: Mirza Aliev
Assignee: Mirza Aliev
Fix For: 2.9
Start cluster under Java 11.
Observed:
CpuLoad metric will return -1
Expected:
Real CpuLoad.
We investigated this issue and found that under Java 11 code failed with following trace:
{noformat}
class org.apache.ignite.IgniteException: Failed to get property value [property=processCpuTime, obj=com.sun.management.internal.OperatingSystemImpl@1dd92fe2] at org.apache.ignite.internal.util.IgniteUtils.property(IgniteUtils.java:8306) at org.apache.ignite.internal.managers.discovery.GridDiscoveryManager$MetricsUpdater.getCpuLoad(GridDiscoveryManager.java:3131) at org.apache.ignite.internal.managers.discovery.GridDiscoveryManager$MetricsUpdater.run(GridDiscoveryManager.java:3093) at org.apache.ignite.internal.processors.timeout.GridTimeoutProcessor$CancelableTask.onTimeout(GridTimeoutProcessor.java:364) at org.apache.ignite.internal.processors.timeout.GridTimeoutProcessor$TimeoutWorker.body(GridTimeoutProcessor.java:233) at org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:119) at java.base/java.lang.Thread.run(Thread.java:834) Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make public long com.sun.management.internal.OperatingSystemImpl.getProcessCpuTime() accessible: module jdk.management does not "opens com.sun.management.internal" to unnamed module @35fb3008 at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340) at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280) at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:198) at java.base/java.lang.reflect.Method.setAccessible(Method.java:192) at org.apache.ignite.internal.util.IgniteUtils.property(IgniteUtils.java:8297) ... 6 more
{noformat}
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Under Java 8 metric has expected value.
Solution:
The behaviour is expected because in Java 11 the CPU load metrics is moved to JDK internal module which is not accessible by default. Adding the following line to the jvm in which Ignite node is started should solve the issue:
--add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED
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