We are excited to announce the availability of the Coherence VisualVM developer plug-in which is part of the new Coherence Incubator 12.1.0 release.
The community plug-in allows developers to view summarised Coherence related statistics and information when connected to a JMX enabled Coherence cluster. Information is collected and summarised from the various Coherence MBeans and displayed in a tabular and graphical format. You also have the ability to select various services and caches to display more detailed node level information about each.
Once installed you will see an additional 'Coherence' tab, when you connect to your Coherence process which is running an MBean server. If you select of this tab, a 'Cluster Summary' tab will be displayed.
The number of sub-tabs displayed varies depending upon what features you are using, but can include:
A sample of the Members sub-tab is shown below, with visual clues - that are included on the various screens - to draw attention to potential issues.
The Services sub-tab below shows how to select an individual service and monitor detailed metrics, like as thread utilisation.
The plug-in is available from GitHub which hosts the source for the latest version of the Coherence Incubator (12.1.0). The Incubator uses the Common Development and Distribution License (CDDL) license and the documentation, which includes how to build and install the plug-in, can be found here.
A pre-built NetBeans Module (NBM) is available via search.maven.org or you can build as part of the Incubator above.
The VisualVM tool is available with any download of JDK 1.7 or at http://visualvm.java.net. The Coherence plug-in is designed to work with JDK 7 Update 40 and above.
If your cluster is running on an earlier version of Java, you can still use the latest JVisualVM and connect remotely to your cluster to view statistics.
Note: This is a developer tool for viewing information about a single cluster at a time. Other monitoring tools such as Oracle's Enterprise Manager or other 3rd party tools are suited for enterprise level monitoring, management and alerting.