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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "CoreAdmin" by ErickErickson
Date Sat, 02 Mar 2013 01:17:52 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "CoreAdmin" page has been changed by ErickErickson:
http://wiki.apache.org/solr/CoreAdmin?action=diff&rev1=45&rev2=46

  <<TableOfContents>>
  
  = Configuration =
+ As of Solr 4.2, there is a major change in configuring cores: solr.xml is being depricated
in favor of a standard Java properties file and a discovery-based exploration of cores in
the subtree defined by the Solr home directory. In the 5.x world, solr.xml will no longer
be supported. The auto-discovery mode will be an option in Solr 4.2. 
  
+ <!> [[Solr 4.x]]
+ [[Solr.xml (pre 5.x)]]
- To enable support for dynamic !SolrCore administration, place a file named ''solr.xml''
in the solr.home 
- directory.  Here is an example ''solr.xml'' file:
- {{{
- <solr persistent="true" sharedLib="lib">
-  <cores adminPath="/admin/cores">
-   <core name="core0" instanceDir="core0" />
-   <core name="core1" instanceDir="core1" />
-  </cores>
- </solr>
- }}}
  
+ <!> [[Solr 5.x]]
+ [[Core Discovery (4.2 and beyond)]]
- You can also specify properties in solr.xml which can be used in the solrconfig.xml and
schema.xml files.
- {{{
- <solr persistent="true" sharedLib="lib">
-  <property name="snapshooter" value="/home/solr-user/solr/bin/snapshooter.sh" />
-  <cores adminPath="/admin/cores">
-   <core name="core0" instanceDir="core0">
-     <property name="dataDir" value="/data/core0" />
-   </core>
-   <core name="core1" instanceDir="core1" />
-  </cores>
- </solr>
- }}}
- The properties can be container scope (i.e. specified after <solr> but outside of
a <core> element) in which case it is automatically inherited by each core. Therefore,
they can be used in any of the cores' configuration files.
  
- The properties can also be defined in a core's scope (inside the <core> element) in
which case they can be used only in that core's scope. If a property by that name already
exists in the container scope then it will be overridden.
- 
- Besides them, a few properties are automatically added in the core scope. They are:
-  * `solr.core.name` -- The core's name as defined in solr.xml
-  * `solr.core.instanceDir` -- The core's instance directory (i.e. the directory under which
that core's `conf/` and `data/` directory are located)
-  * `solr.core.dataDir` -- The core's data directory (i.e. the directory under which that
core's index directory are located)
-  * `solr.core.configName` -- The name of the core's config file (solrconfig.xml by default)
-  * `solr.core.schemaName` -- The name of the core's schema file (schema.xml by default)
- 
- Such properties can be used inside solrconfig.xml and schema.xml files by specifying an
expression with optionally, a default value.
- {{{
- // Without a default value
- ${snapshooter}
- // With a default value
- ${snapshooter:./solr/bin/snapshooter.sh}
- }}}
- The above expression will evaluate to the value specified in solr.xml for the property name
"solr.snapshooter". If no value is defined in solr.xml, it will check if a system property
by that name exists otherwise it will use the specified default value. If no default value
is specified, a runtime exception will be thrown and the core may fail to startup.
- 
- == solr ==
- The `<solr>` tag accepts two attributes:
-   *'''persistent''' - By default, should runtime core manipulation be saved in ''solr.xml''
so that it is available after a restart.
-   *'''sharedLib''' - Path to a directory containing .jar files that are added to the classpath
of every core.  The path is relative to solr.home (where solr.xml sits)
-   * <!> [[Solr4.0]] '''zkHost''' - Used for SolrCloud, zookeeper server list.
- 
- == cores ==
- The `<cores>` tag accepts the following attributes:
-   *'''hostPort''' - The port solr uses to access cores.  For example, you can set hostPort="8080"
when working with Tomcat.
-   *'''adminPath''' - Relative path to access the !CoreAdminHandler for dynamic core manipulation.
 For example, adminPath="/admin/cores" configures access via http://localhost:8983/solr/admin/cores.
 If this attribute is not specified, dynamic manipulation is unavailable.
-   ** <!> [[Solr1.4]] '''defaultCoreName''' - The name of a core that will be used
for requests that don't specify a core.  If you have one core and want to use the features
specified on this page, then this provides a way to keep your URLs the same.
-   ** <!> [[Solr1.4]] '''shareSchema''' - The value can be 'true' or 'false'. This
ensures that the multiple cores pointing to the same schema.xml will be referring to the same
!IndexSchema Object. This makes loading the core faster. Ensure that no core specific property
is used in your schema.xml.
-   * <!> [[Solr4.0]] '''hostContext''' - the host context of solr url.
-   * <!> [[Solr4.0]] '''zkClientTimeout''' - Timeout for connection of zookeeper server.
It's used for SolrCloud environment for ensure the connection status.
-   * <!> [[Solr4.1]] '''transientCacheSize''' - The limit for the LRU cache of "lazily
loaded" cores. More at [[LotsOfCores|LotsOfCores]]
-   * <!> [[Solr1.4]] '''adminHandler''' - FQN(Fully qualified name) of a class that
 inherits from !CoreAdminHandler.  For example, adminHandler="com.myorg.!MyAdminHandler" would
configure the custom admin handler (!MyAdminHandler) to handler admin requests ( as opposed
to org.apache.solr.handler.admin.!CoreAdminHandler , that is the default admin handler if
one is not specified ). To illustrate an use case for the same - suppose if there is a need
to get some statistics from different cores in a solr instance - we would proceed as follows.

-    * Define a new action called 'mystat' that could be accessed from the client  as below.

-    http://localhost:8983/solr/admin/cores?action=MYSTAT
-    * <!> [[Solr4.0]] Note that to load up your custom handler, you may need to use
the sharedLib attribute mentioned in the `<solr>` tag section.
-    * Define the implementation of that action as
-  
- {{{
- import org.apache.solr.handler.admin.CoreAdminHandler ;
- 
- class MyAdminHandler extends CoreAdminHandler { 
-     
-   /**
-    * @return true, if the changes need to be persisted by the CoreContainer. (use only if
solr.xml would be changed because of this action. )
-    *         false, otherwise.   (Use this if unsure or having a read-only access to the
CoreContainer like collecting statistics)
-    * 
-    */ 
-   protected boolean handleCustomAction(SolrQueryRequest req, SolrQueryResponse rsp) {
-      CoreContainer container = super.getCoreContainer(); 
-      SolrCore mycore1 = container.getCore("core1");
-      SolrCore mycore2 = container.getCore("core2");
-      SolrParams params = req.getParams();
-      String a = params.get( CoreAdminParams.ACTION );
-      if (a.equalsIgnoreCase("mystat"))  {
-          // TODO: populate 'rsp' as necessary. 
-       } 
-   } 
- }
- }}}
- 
-   <!> [[Solr4.0]] Note that you may need to declare the two constructors for it to
be instantiated successfully.
- 
-   There are other methods in [[http://lucene.apache.org/solr/api/org/apache/solr/handler/admin/CoreAdminHandler.html|CoreAdminHandler]]
that could be used to override default action-s, but for most of the common cases they would
not be necessary but left best to the experts. 
- {{{
- class MyAdminHandler extends CoreAdminHandler { 
-     //Available for override , but unnecessary except for the rare case. 
-      protected boolean handleAliasAction(SolrQueryRequest req, SolrQueryResponse rsp) ;

-      protected boolean handleCreateAction(SolrQueryRequest req, SolrQueryResponse rsp) ;

-      // etc. 
- }
- }}}
- 
-   See [[https://issues.apache.org/jira/browse/SOLR-1106|SOLR-1106]] for more details. 
- 
- The `<core>` tag accepts the following attributes:
-   *'''name''' - The registered core name.  This will be how the core is accessed.
-   *'''instanceDir''' - The ''solr.home'' directory for a given core.
-   *'''config''' - The configuration file name for a given core. The default is 'solrconfig.xml'.
-   *'''schema''' - The schema file name for a given core. The default is 'schema.xml'.
-   *'''dataDir''' - The data directory for a given core. The default is <instanceDir>/data
. It can take an absolute path or a relative path w.r.t instanceDir . <!> [[Solr1.4]]
-   * '''loadOnStartup''' - true|false. Whether the core should be completely loaded upon
startup. More at [[LotsOfCores|LotsOfCores]] <!> [[Solr4.1]]
-   * '''transient'''- true|false. Whether the core is allowed to be swapped out or not. More
at [[LotsOfCores|LotsOfCores]] <!> [[Solr4.1]]
-   *'''properties''' - The core properties file name.This can be an absolute or relative
path(relative to instanceDir) <!> [[Solr1.4]]
- 
- == property ==
- The `<property>` tag accepts two attributes:
-   *'''name''' - The name of the property
-   *'''value''' - The value of the property 
- 
- == solr.xml Permissions ==
- It is important to note that persistent=true functionality ''''replaces'''' solr.xml it
does not edit it.  This means that the directory the file is in needs to allow the web server
to replace the file.  If the permissions are set incorrectly it will give 500 errors and throw
IOExceptions.  Additionally, all comments are wiped from the file on save.
- 
- = Example =
- 
- Solr ships with an example running two cores together setup.  To run this configuration,
start jetty in the `example/` directory using:
- {{{
- java -Dsolr.solr.home=multicore -jar start.jar
- }}}
- 
- This will start solr running two cores: ''core0'', and ''core1''.  To access each core,
try:
-  http://localhost:8983/solr/core0/select?q=*:*
-  
-  http://localhost:8983/solr/core1/select?q=*:*
- 
- 
- To access the admin pages for each core visit:
-  http://localhost:8983/solr/core0/admin/
-  
-  http://localhost:8983/solr/core1/admin/
  
  = CoreAdminHandler =
  

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