[jira] [Created] (NIFI-2858) getSystemLoadAverage of OperatingSystemMXBean sometimes returns a negative value.

["Byunghwa Yun (JIRA)" <ji...@apache.org>]

Byunghwa Yun created NIFI-2858:
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             Summary: getSystemLoadAverage of OperatingSystemMXBean sometimes returns a negative value.
                 Key: NIFI-2858
                 URL: https://issues.apache.org/jira/browse/NIFI-2858
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
    Affects Versions: 1.0.0
            Reporter: Byunghwa Yun


When NiFi cluster is busy, Sometimes Cluster of Global Menu throws below an exception.
So, I was tracking that exception to find a problem that getSystemLoadAverage of OperatingSystemMXBean sometimes returns a negative value.

2016-10-04 14:53:20,488 ERROR [NiFi Web Server-40942] o.a.nifi.web.api.config.ThrowableMapper An unexpected error has occurred: java.lang.NullPointerException. Returning Internal Server Error response.
java.lang.NullPointerException: null
        at org.apache.nifi.cluster.manager.StatusMerger.merge(StatusMerger.java:576) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.cluster.manager.StatusMerger.merge(StatusMerger.java:548) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.cluster.coordination.http.endpoints.SystemDiagnosticsEndpointMerger.mergeResponses(SystemDiagnosticsEndpointMerger.java:69) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.cluster.coordination.http.endpoints.SystemDiagnosticsEndpointMerger.mergeResponses(SystemDiagnosticsEndpointMerger.java:31) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.cluster.coordination.http.endpoints.AbstractNodeStatusEndpoint.mergeResponses(AbstractNodeStatusEndpoint.java:41) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.cluster.coordination.http.endpoints.AbstractSingleDTOEndpoint.merge(AbstractSingleDTOEndpoint.java:48) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.cluster.coordination.http.StandardHttpResponseMerger.mergeResponses(StandardHttpResponseMerger.java:179) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.cluster.coordination.http.replication.StandardAsyncClusterResponse.getMergedResponse(StandardAsyncClusterResponse.java:145) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.cluster.coordination.http.replication.StandardAsyncClusterResponse.awaitMergedResponse(StandardAsyncClusterResponse.java:160) ~[nifi-framework-cluster-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
        at org.apache.nifi.web.api.SystemDiagnosticsResource.getSystemDiagnostics(SystemDiagnosticsResource.java:141) ~[classes/:na]
        at sun.reflect.GeneratedMethodAccessor988.invoke(Unknown Source) ~[na:na]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_51]
        at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_51]
        at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) ~[jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205) ~[jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) ~[jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) ~[jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) ~[jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) ~[jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) ~[jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) [jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) [jersey-server-1.19.jar:1.19]
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) [jersey-server-1.19.jar:1.19]


When systemLoad of SystemDiagnosticsFactory is negative, it skips setting setProcessorLoadAverage of SystemDiagnostics.

        if (systemLoad > 0) {
            systemDiagnostics.setProcessorLoadAverage(systemLoad);
        }

I think to set systemLoad even a negative value.

Thank you.



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