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| Recently, I use JMXterm to collect info about Java JVM via JMX and MBeans. Here is a short note. | |
| - Download JMXterm | |
| https://sourceforge.net/projects/cyclops-group/files/jmxterm/1.0.0/jmxterm-1.0.0-uber.jar/download | |
| - Run JMXterm | |
| java -jar jmxterm-1.0.0-uber.jar --url localhost:<jmx listen port> | |
| - All MBeans from java.lang | |
| $>domain java.lang | |
| $>beans | |
| java.lang:name=CMS Old Gen,type=MemoryPool | |
| java.lang:name=Code Cache,type=MemoryPool | |
| java.lang:name=CodeCacheManager,type=MemoryManager | |
| java.lang:name=Compressed Class Space,type=MemoryPool | |
| java.lang:name=ConcurrentMarkSweep,type=GarbageCollector | |
| java.lang:name=Metaspace Manager,type=MemoryManager | |
| java.lang:name=Metaspace,type=MemoryPool | |
| java.lang:name=Par Eden Space,type=MemoryPool | |
| java.lang:name=Par Survivor Space,type=MemoryPool | |
| java.lang:name=ParNew,type=GarbageCollector | |
| java.lang:type=ClassLoading | |
| java.lang:type=Compilation | |
| java.lang:type=Memory | |
| java.lang:type=OperatingSystem | |
| java.lang:type=Runtime | |
| java.lang:type=Threading | |
| - Usually, we want to know how many time a garbage collection happen and how long a garbage collection is, so we use 2 MBeans | |
| java.lang:name=ParNew,type=GarbageCollector (young GC) | |
| java.lang:name=ConcurrentMarkSweep,type=GarbageCollector (in this case, I use CMS as major GC) | |
| Now, let's explore inside | |
| $>bean java.lang:name=ParNew,type=GarbageCollector | |
| If Name has space, follow it by \\ | |
| $>bean java.lang:name=PS\\ Scavenge,type=GarbageCollector | |
| $>info | |
| #mbean = java.lang:name=ParNew,type=GarbageCollector | |
| #class name = sun.management.GarbageCollectorImpl | |
| # attributes | |
| %0 - CollectionCount (long, r) | |
| %1 - CollectionTime (long, r) | |
| %2 - LastGcInfo (javax.management.openmbean.CompositeData, r) | |
| %3 - MemoryPoolNames ([Ljava.lang.String;, r) | |
| %4 - Name (java.lang.String, r) | |
| %5 - ObjectName (javax.management.ObjectName, r) | |
| %6 - Valid (boolean, r) | |
| #there's no operations | |
| # notifications | |
| %0 - javax.management.Notification(com.sun.management.gc.notification) | |
| Here, we care about CollectionCount and CollectionTime. Let's do a simple query. | |
| $>get CollectionCount | |
| #mbean = java.lang:name=ParNew,type=GarbageCollector: | |
| CollectionCount = 546; | |
| So, we can do something similar to fetch the query result to a time-series database, then have grafana draw a graph for us | |
| - Query by Zabbix Zabbix jmxagent | |
| Define an item with a key like this: | |
| jmx["java.lang:type=GarbageCollector,name=ParNew","CollectionCount"] | |
| - Query by collectd JMX plugin. | |
| Well, this is more complicated to define, because of the plugin configuration. We can take an example here: https://gist.github.com/huynhbaoan/e2cf40654649237cd6ca495ce5a9e13b | |
| And the offical document: https://collectd.org/wiki/index.php/Plugin:GenericJMX | |
| I will update collectd configurations later, if we decide to use this for our monitor solution. | |
| - TL; DR: | |
| Here is a short list of key to apply on Zabbix jmx agent. You can use these MBeans info to configure collectd plugin. | |
| jmx["java.lang:type=GarbageCollector,name=ParNew","CollectionCount"] | |
| jmx["java.lang:type=GarbageCollector,name=ParNew","CollectionTime"] | |
| jmx["java.lang:type=GarbageCollector,name=ConcurrentMarkSweep","CollectionCount"] | |
| jmx["java.lang:type=GarbageCollector,name=ConcurrentMarkSweep","CollectionTime"] | |
| jmx["java.lang:type=Memory","HeapMemoryUsage.used"] | |
| jmx["java.lang:type=Memory","HeapMemoryUsage.max"] | |
| jmx["java.lang:type=Memory","NonHeapMemoryUsage.used"] | |
| jmx["java.lang:type=Memory","NonHeapMemoryUsage.max"] | |
| jmx["java.lang:type=MemoryPool,name=Par Eden Space","Usage.used"] | |
| jmx["java.lang:type=MemoryPool,name=Par Survivor Space","Usage.used"] | |
| jmx["java.lang:type=MemoryPool,name=CMS Old Gen","Usage.used"] | |
| jmx["java.lang:type=MemoryPool,name=CMS Perm Gen","Usage.used"] | |
| jmx["java.lang:type=MemoryPool,name=Code Cache","Usage.used"] | |
| jmx["java.lang:type=Threading","DaemonThreadCount"] | |
| jmx["java.lang:type=ClassLoading","LoadedClassCount"] | |
| jmx["java.lang:type=ClassLoading","UnloadedClassCount"] | |
| jmx["java.lang:type=OperatingSystem","ProcessCpuLoad"] | |
| jmx["java.lang:type=Threading","ThreadCount"] | |
| jmx["java.lang:type=Compilation","TotalCompilationTime"] |
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Monitor JMX performance
https://www.linkedin.com/pulse/javajmxmonitoring-ultimate-monitoring-jvm-application-%C5%9Blusarski