Wiki source code of Monitoring

Version 30.2 by Vincent Massol on 2018/10/15

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.
	10	* Starting with XWiki 2.4M2 we're now using the [[JMX Technology>>http://en.wikipedia.org/wiki/Java_Management_Extensions]] to provide runtime monitoring of XWiki instances. The following features are currently available:
1.1	11	** Monitor the Velocity macro caches
3.3	12	** Monitor the JBossCache caches XWiki is using to cache Document data, Users & Groups data and more
8.1	13	** (starting with XE 3.1) Monitor the JGroups channel and protocols (when the XWiki Cluster feature is turned on)
	14	** (starting with XE 3.1) Monitor the Logback Logging configuration and change it
1.1	15
2.3	16	{{info}}
26.4	17	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	18	{{/info}}
	19
29.1	20	= Glowroot =
	21
30.2	22	{{image reference="glowroot.png" width="650px"/}}
29.1	23
	24	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]].
	25
13.2	26	= JavaMelody =
	27
24.3	28	[[[[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	29
24.2	30	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	31
24.2	32	* 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	33	* Edit ##web.xml## and add the following information:(((
	34	{{code}}
	35	...
	36	<filter>
	37	<filter-name>monitoring</filter-name>
	38	<filter-class>net.bull.javamelody.MonitoringFilter</filter-class>
	39	</filter>
25.1	40	<!-- to enable BASIC authentication with username and password, but do no want to use a realm and "security-constraint"
28.1	41	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	42	<filter>
	43	<filter-name>javamelody</filter-name>
	44	<filter-class>net.bull.javamelody.MonitoringFilter</filter-class>
	45	<init-param>
	46	<param-name>authorized-users</param-name>
	47	<param-value>user1:pwd1, user2:pwd2</param-value>
	48	</init-param>
28.1	49	<init-param>
	50	<param-name>storage-directory</param-name>
	51	<param-value>/path/of/javamelody/stats</param-value>
	52	</init-param>
25.1	53	</filter> -->
13.2	54	... other <filter>s from the default web.xml here ...
	55
	56	<filter-mapping>
	57	<filter-name>monitoring</filter-name>
	58	<url-pattern>/*</url-pattern>
	59	</filter-mapping>
	60	... other <filter-mapping>s from the default web.xml here ...
	61
	62	<listener>
	63	<listener-class>net.bull.javamelody.SessionListener</listener-class>
	64	</listener>
	65	... other <listener>s from the default web.xml here ...
	66	...
	67	{{/code}}
	68	)))
	69	* Edit ##hibernate.cfg.xml## and add:(((
	70	{{code}}
	71	<property name="jdbc.factory_class">net.bull.javamelody.HibernateBatcherFactory</property>
	72	{{/code}}
	73	)))
	74
26.1	75	Then restart XWiki and access JavaMelody at ##http:~/~/localhost:8080/xwiki/monitoring##.
13.2	76
27.1	77	{{warning}}
	78	Recent versions of JavaMelody (at least 1.70+ ?) require the configuration in this guide to be adapted like this:
	79
	80	{{code}}
	81	in web.xml:
	82	-----------
	83
	84	<filter>
	85	<filter-name>javamelody</filter-name>
	86	<filter-class>net.bull.javamelody.MonitoringFilter</filter-class>
	87	<async-supported>true</async-supported>
	88	</filter>
	89	<filter-mapping>
	90	<filter-name>javamelody</filter-name>
	91	<url-pattern>/*</url-pattern>
	92	<dispatcher>REQUEST</dispatcher>
	93	<dispatcher>ASYNC</dispatcher>
	94	</filter-mapping>
	95	<listener>
	96	<listener-class>net.bull.javamelody.SessionListener</listener-class>
	97	</listener>
	98
	99
	100
	101	in hibernate.cfg.xml:
	102	---------------------
	103
	104	<property name="connection.driver_class">net.bull.javamelody.JdbcDriver</property>
	105	<property name="connection.driver">com.mysql.jdbc.Driver</property>
	106	{{/code}}
	107	{{/warning}}
	108
1.1	109	= JMX Console =
	110
17.3	111	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	112
24.1	113	{{info}}
	114	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	115
24.1	116	{{image reference="jettymbeans.png"/}}
	117	{{/info}}
	118
11.1	119	== XWiki Caches Monitoring ==
	120
14.1	121	XWiki can use different cache implementations. The JBoss Cache and JBoss Infinispan implementations have nice JMX features available as shown below.
11.1	122
17.3	123	Starting with XWiki 3.3 the default implementation is JBoss Infinispan.
14.1	124
	125	=== With JBoss Infinispan ===
	126
	127	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]]).
	128
17.3	129	{{info}}
26.1	130	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	131	{{/info}}
14.1	132
	133	Example showing the cache list and some statistic for a given cache:
	134
17.3	135	{{image reference="infinispancache.png"/}}
14.1	136
20.1	137	Example showing how to clear a given cache from all its entries:
	138
	139	{{image reference="infinispancacheclearing.png"/}}
	140
14.1	141	=== With JBoss Cache ===
	142
17.3	143	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	144
11.1	145	Example showing all JBoss Caches in memory in a running instance, showing all the elements in the cache (example on the document cache):
	146
17.2	147	{{image reference="jbosscache.png"/}}
11.1	148
	149	Example showing Cache stats (for the document cache):
	150
17.2	151	{{image reference="jbosscache-stats.png"/}}
11.1	152
4.1	153	== Velocity Cache Monitoring ==
1.1	154
12.2	155	Velocity caches Velocity macros. XWiki offers a JMX view of the content of the Velocity caches.
	156
4.1	157	JConsole examples showing the Velocity Cache monitoring:
	158
17.2	159	{{image reference="jconsole1.png"/}}
1.1	160
17.2	161	{{image reference="jconsole2.png"/}}
1.1	162
4.1	163	== JGroups Monitoring ==
	164
	165	JConsole example showing the JGroups monitoring:
	166
17.2	167	{{image reference="jgroups.png"/}}
4.1	168
	169	Interesting things to do on JGroups in the JMX console:
26.1	170
4.1	171	* Change the log level on the protocols to enable logging
	172	* Disconnect a node from the cluster and reconnect it
	173
10.1	174	== Logback Monitoring ==
	175
	176	JConsole example showing how to modify the logging level for a category:
	177
17.2	178	{{image reference="jmx-logging.png"/}}
10.1	179
7.1	180	= Tomcat JMX Proxy Servlet =
	181
	182	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]].
	183
	184	Here's some useful URLs to use the JMX Servlet Proxy to list and set JGroups Protocol Levels:
26.1	185
7.1	186	* To display the current log level for the TCPPING protocol: {{{http://localhost:8080/manager/jmxproxy?qry=jgroups:type=protocol,cluster=event,protocol=TCPPING}}}
	187	* 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}}}
	188
18.1	189	= Others =
7.1	190
28.2	191	* It's possible to [[write a Groovy script in a wiki page to access the JMX MBeans>>snippets:Extension.JMX Access]].
18.1	192	* [[JMX Monitoring Application>>extensions:Extension.JMX Monitoring Application]]
19.1	193	* [[XInit>>extensions:Extension.Xinit]]

Wiki source code of Monitoring

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