[
https://issues.apache.org/jira/browse/NIFI-2858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Matt Gilman resolved NIFI-2858.
-------------------------------
Resolution: Fixed
Fix Version/s: 1.1.0
> getSystemLoadAverage of OperatingSystemMXBean sometimes returns zero or 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: 1.1.0
> Reporter: Byunghwa Yun
> Fix For: 1.1.0
>
>
> 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 zero or 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 zero or a negative value, it
> skips setting setProcessorLoadAverage of SystemDiagnostics.
> if (systemLoad > 0) {
> systemDiagnostics.setProcessorLoadAverage(systemLoad);
> }
> I think when getSystemLoadAverage returns a negative value, systemLoad sets
> -1.0 and returns zero, systemLoad sets zero.
> Thank you.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
