Wiki source code of Monitoring

Version 32.1 by Vincent Massol on 2020/08/04

version	line-number	content
6.1	1	{{box cssClass="floatinginfobox" title="Contents"}}
	2	{{toc/}}
	3	{{/box}}
	4
13.2	5	There are various solutions you can use to monitor a running XWiki instance:
26.1	6
29.1	7	* Install and configure [[Glowroot>>https://glowroot.org]]
24.2	8	* Install and configure [[JavaMelody>>https://github.com/javamelody/javamelody/wiki]]
26.1	9	* [[Use a Profiler>>dev:Community.Profiling]]. This has the advantage of providing advanced information, but has the drawback of being resource intensive and thus slowing the XWiki instance. It also requires a special startup script.
32.1	10	* XWiki is using the [[JMX Technology>>http://en.wikipedia.org/wiki/Java_Management_Extensions]] to provide runtime monitoring of XWiki instances. The following features are available:
31.2	11	** Monitor the InfiniSpan caches XWiki is using to cache Document data, Users & Groups data and more
	12	** Monitor the JGroups channel and protocols (when the XWiki Cluster feature is turned on)
	13	** Monitor the Logback Logging configuration and change it
	14	** Monitor Solr cores
32.1	15	** Monitor Apache DBCP connection pool
	16	** Monitor Hibernate
1.1	17
2.3	18	{{info}}
26.4	19	XWiki also has a [[Monitor Plugin>>Documentation.AdminGuide.Logging\|\|anchor="HActivatingtheXWikiMonitoringfeature"]] that you can use to monitor execution times. However this plugin is going to be deprecated in the future and replaced by the JMX technology.
2.3	20	{{/info}}
	21
29.1	22	= Glowroot =
	23
30.2	24	{{image reference="glowroot.png" width="650px"/}}
29.1	25
	26	There is nothing specific about XWiki when you install Glowroot, just follow [[the standard documentation>>https://github.com/glowroot/glowroot/wiki/Agent-Installation-%28with-Embedded-Collector%29]].
	27
13.2	28	= JavaMelody =
	29
24.3	30	[[[[image:https://raw.githubusercontent.com/wiki/javamelody/javamelody/resources/screenshots/graphs.png\|\|width="50%"]]>>https://github.com/javamelody/javamelody/wiki/Screenshots#charts\|\|style="width:50%"]]
13.2	31
24.2	32	To install JavaMelody for XWiki follow these steps (see the [[JavaMelody user guide>>https://github.com/javamelody/javamelody/wiki/UserGuide]] for more details):
26.1	33
24.2	34	* Download the latest [[javamelody.jar>>https://github.com/javamelody/javamelody/releases]] and [[jrobin-x.jar>>https://github.com/javamelody/javamelody/releases/download/javamelody-core-1.49.0/jrobin-1.5.9.jar]] and put them in the ##WEB-INF/lib## folder
13.2	35	* Edit ##web.xml## and add the following information:(((
	36	{{code}}
	37	...
	38	<filter>
	39	<filter-name>monitoring</filter-name>
	40	<filter-class>net.bull.javamelody.MonitoringFilter</filter-class>
	41	</filter>
25.1	42	<!-- to enable BASIC authentication with username and password, but do no want to use a realm and "security-constraint"
28.1	43	The storage files of statistics and of graphs are stored in the temporary directory of the server, unless if you have defined the "storage-directory" path
25.1	44	<filter>
	45	<filter-name>javamelody</filter-name>
	46	<filter-class>net.bull.javamelody.MonitoringFilter</filter-class>
	47	<init-param>
	48	<param-name>authorized-users</param-name>
	49	<param-value>user1:pwd1, user2:pwd2</param-value>
	50	</init-param>
28.1	51	<init-param>
	52	<param-name>storage-directory</param-name>
	53	<param-value>/path/of/javamelody/stats</param-value>
	54	</init-param>
25.1	55	</filter> -->
13.2	56	... other <filter>s from the default web.xml here ...
	57
	58	<filter-mapping>
	59	<filter-name>monitoring</filter-name>
	60	<url-pattern>/*</url-pattern>
	61	</filter-mapping>
	62	... other <filter-mapping>s from the default web.xml here ...
	63
	64	<listener>
	65	<listener-class>net.bull.javamelody.SessionListener</listener-class>
	66	</listener>
	67	... other <listener>s from the default web.xml here ...
	68	...
	69	{{/code}}
	70	)))
	71	* Edit ##hibernate.cfg.xml## and add:(((
	72	{{code}}
	73	<property name="jdbc.factory_class">net.bull.javamelody.HibernateBatcherFactory</property>
	74	{{/code}}
	75	)))
	76
26.1	77	Then restart XWiki and access JavaMelody at ##http:~/~/localhost:8080/xwiki/monitoring##.
13.2	78
27.1	79	{{warning}}
	80	Recent versions of JavaMelody (at least 1.70+ ?) require the configuration in this guide to be adapted like this:
	81
	82	{{code}}
	83	in web.xml:
	84	-----------
	85
	86	<filter>
	87	<filter-name>javamelody</filter-name>
	88	<filter-class>net.bull.javamelody.MonitoringFilter</filter-class>
	89	<async-supported>true</async-supported>
	90	</filter>
	91	<filter-mapping>
	92	<filter-name>javamelody</filter-name>
	93	<url-pattern>/*</url-pattern>
	94	<dispatcher>REQUEST</dispatcher>
	95	<dispatcher>ASYNC</dispatcher>
	96	</filter-mapping>
	97	<listener>
	98	<listener-class>net.bull.javamelody.SessionListener</listener-class>
	99	</listener>
	100
	101
	102
	103	in hibernate.cfg.xml:
	104	---------------------
	105
	106	<property name="connection.driver_class">net.bull.javamelody.JdbcDriver</property>
	107	<property name="connection.driver">com.mysql.jdbc.Driver</property>
	108	{{/code}}
	109	{{/warning}}
	110
1.1	111	= JMX Console =
	112
17.3	113	Since JMX is a standard you can use [[any JMX-compatible monitoring console>>http://stackoverflow.com/questions/1744900/what-is-the-best-or-most-commonly-used-jmx-console-client]] (most application servers provide a web-based JMX console). There's also a console called [[JConsole>>http://docs.oracle.com/javase/7/docs/technotes/guides/management/jconsole.html]] which is bundled by default in the Java Runtime you're using. To start it, simply execute the ##jconsole## executable.
1.1	114
24.1	115	{{info}}
	116	Note that starting with XWiki 6.3, if you're using the Standalone Distribution (which bundles Jetty) you can now use ##start_xwiki.sh -j## (or ##start_xwiki.sh ~-~-jmx##) to monitor/manage the Jetty instance itself (it adds Jetty-specific MBeans):
22.1	117
24.1	118	{{image reference="jettymbeans.png"/}}
	119	{{/info}}
	120
11.1	121	== XWiki Caches Monitoring ==
	122
14.1	123	XWiki can use different cache implementations. The JBoss Cache and JBoss Infinispan implementations have nice JMX features available as shown below.
11.1	124
17.3	125	Starting with XWiki 3.3 the default implementation is JBoss Infinispan.
14.1	126
	127	=== With JBoss Infinispan ===
	128
	129	Since JBoss Infinispan natively supports JMX we benefit from this feature directly (JBoss documentation available [[here>>https://docs.jboss.org/author/display/ISPN/Management+Tooling]]).
	130
17.3	131	{{info}}
26.1	132	Prior to XWiki 3.5 the JMX support was not enabled by default. To enable it, edit ##WEB-INF/cache/infinispan/config.xml## and uncomment the two places where the "jmx" string is mentioned
17.3	133	{{/info}}
14.1	134
	135	Example showing the cache list and some statistic for a given cache:
	136
17.3	137	{{image reference="infinispancache.png"/}}
14.1	138
20.1	139	Example showing how to clear a given cache from all its entries:
	140
	141	{{image reference="infinispancacheclearing.png"/}}
	142
14.1	143	=== With JBoss Cache ===
	144
17.3	145	Since JBoss Cache natively supports JMX we benefit from this feature directly (JBoss documentation available [[here>>https://access.redhat.com/knowledge/docs/en-US/JBoss_Enterprise_Web_Platform/5/html/JBoss_Cache_User_Guide/jmx_reference.html]]).
14.1	146
11.1	147	Example showing all JBoss Caches in memory in a running instance, showing all the elements in the cache (example on the document cache):
	148
17.2	149	{{image reference="jbosscache.png"/}}
11.1	150
	151	Example showing Cache stats (for the document cache):
	152
17.2	153	{{image reference="jbosscache-stats.png"/}}
11.1	154
4.1	155	== Velocity Cache Monitoring ==
1.1	156
12.2	157	Velocity caches Velocity macros. XWiki offers a JMX view of the content of the Velocity caches.
	158
4.1	159	JConsole examples showing the Velocity Cache monitoring:
	160
17.2	161	{{image reference="jconsole1.png"/}}
1.1	162
17.2	163	{{image reference="jconsole2.png"/}}
1.1	164
4.1	165	== JGroups Monitoring ==
	166
	167	JConsole example showing the JGroups monitoring:
	168
17.2	169	{{image reference="jgroups.png"/}}
4.1	170
	171	Interesting things to do on JGroups in the JMX console:
26.1	172
4.1	173	* Change the log level on the protocols to enable logging
	174	* Disconnect a node from the cluster and reconnect it
	175
10.1	176	== Logback Monitoring ==
	177
	178	JConsole example showing how to modify the logging level for a category:
	179
17.2	180	{{image reference="jmx-logging.png"/}}
10.1	181
7.1	182	= Tomcat JMX Proxy Servlet =
	183
	184	Tomcat has a JMX Proxy Servlet bundled in their ##manager## webapp (see [[here>>http://tomcat.apache.org/tomcat-6.0-doc/manager-howto.html]] and [[here>>http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html]] for more details on Tomcat and JMX]].
	185
	186	Here's some useful URLs to use the JMX Servlet Proxy to list and set JGroups Protocol Levels:
26.1	187
7.1	188	* To display the current log level for the TCPPING protocol: {{{http://localhost:8080/manager/jmxproxy?qry=jgroups:type=protocol,cluster=event,protocol=TCPPING}}}
	189	* To set the log level to ##info## for the TCPPING protocol: {{{http://localhost:8080/manager/jmxproxy?set=jgroups:type=protocol,cluster=event,protocol=TCPPING&att=Level&val=info}}}
	190
18.1	191	= Others =
7.1	192
28.2	193	* It's possible to [[write a Groovy script in a wiki page to access the JMX MBeans>>snippets:Extension.JMX Access]].
18.1	194	* [[JMX Monitoring Application>>extensions:Extension.JMX Monitoring Application]]
31.1	195	* [[Clearing Document Caches with JMX>>snippets:Extension.Clear Document Caches.WebHome]]
19.1	196	* [[XInit>>extensions:Extension.Xinit]]

Wiki source code of Monitoring

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