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}
{{}}
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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