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| " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 7</font></h1><font face="arial,helvetica,sanserif">Version 7.0.77, Mar 28 2017</font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="../images/asf-logo.svg" align="right" alt="Apache Logo" border="0" style="width: 266px;height: 83px;"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap class="noPrint"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li><li><a href="http://wiki.apache.org/tomcat/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul><p><strong>Top Level Elements</strong></p><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul><p><strong>Executors</strong></p><ul><li><a href="executor.html">Executor</a></li></ul><p><strong>Connectors</strong></p><ul><li><a href="http.html">HTTP</a></li><li><a href="ajp.html">AJP</a></li></ul><p><strong>Containers</strong></p><ul><li><a href="context.html">Context</a></li><li><a href="engine.html">Engine</a></li><li><a href="host.html">Host</a></li><li><a href="cluster.html">Cluster</a></li></ul><p><strong>Nested Components</strong></p><ul><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</a></li><li><a href="listeners.html">Listeners</a></li><li><a href="loader.html">Loader</a></li><li><a href="manager.html">Manager</a></li><li><a href="realm.html">Realm</a></li><li><a href="resources.html">Resources</a></li><li><a href="sessionidgenerator.html">SessionIdGenerator</a></li><li><a href="valve.html">Valve</a></li></ul><p><strong>Cluster Elements</strong></p><ul><li><a href="cluster.html">Cluster</a></li><li><a href="cluster-manager.html">Manager</a></li><li><a href="cluster-channel.html">Channel</a></li><li><a href="cluster-membership.html">Channel/Membership</a></li><li><a href="cluster-sender.html">Channel/Sender</a></li><li><a href="cluster-receiver.html">Channel/Receiver</a></li><li><a href="cluster-interceptor.html">Channel/Interceptor</a></li><li><a href="cluster-valve.html">Valve</a></li><li><a href="cluster-deployer.html">Deployer</a></li><li><a href="cluster-listener.html">ClusterListener</a></li></ul><p><strong>web.xml</strong></p><ul><li><a href="filter.html">Filter</a></li></ul><p><strong>Other</strong></p><ul><li><a href="systemprops.html">System properties</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left" id="mainBody"><h1>The ClusterManager object</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Table of Contents"><!--()--></a><a name="Table_of_Contents"><strong>Table of Contents</strong></a></font></td></tr><tr><td><blockquote> | |
| <ul><li><a href="#Introduction">Introduction</a></li><li><a href="#The_<Manager>">The <Manager></a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common Attributes</a></li><li><a href="#org.apache.catalina.ha.session.DeltaManager_Attributes">org.apache.catalina.ha.session.DeltaManager Attributes</a></li><li><a href="#org.apache.catalina.ha.session.BackupManager_Attributes">org.apache.catalina.ha.session.BackupManager Attributes</a></li></ol></li><li><a href="#Nested_Components">Nested Components</a></li></ul> | |
| </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> | |
| <p>A cluster manager is an extension to Tomcat's session manager interface, | |
| <code>org.apache.catalina.Manager</code>. | |
| A cluster manager must implement the | |
| <code>org.apache.catalina.ha.ClusterManager</code> and is solely responsible | |
| for how the session is replicated.<br> | |
| There are currently two different managers, the | |
| <code>org.apache.catalina.ha.session.DeltaManager</code> replicates deltas of | |
| session data to all members in the cluster. This implementation is proven and | |
| works very well, but has a limitation as it requires the cluster members to be | |
| homogeneous, all nodes must deploy the same applications and be exact | |
| replicas. The <code>org.apache.catalina.ha.session.BackupManager</code> also | |
| replicates deltas but only to one backup node. The location of the backup node | |
| is known to all nodes in the cluster. It also supports heterogeneous | |
| deployments, so the manager knows at what locations the web application is | |
| deployed.</p> | |
| </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="The <Manager>"><!--()--></a><a name="The_<Manager>"><strong>The <Manager></strong></a></font></td></tr><tr><td><blockquote> | |
| <p>The <code><Manager></code> element defined inside the | |
| <code><Cluster></code> element is the template defined for all web | |
| applications that are marked <code><distributable/></code> in their | |
| <code>web.xml</code> file. However, you can still override the manager | |
| implementation on a per web application basis, by putting the | |
| <code><Manager></code> inside the <code><Context></code> element | |
| either in the <code><a href="context.html">context.xml</a></code> file or the | |
| <code><a href="index.html">server.xml</a></code> file.</p> | |
| </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> | |
| <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"><!--()--></a><a name="Common_Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> | |
| <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">className</code></strong></td><td align="left" valign="center"> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">name</code></td><td align="left" valign="center"> | |
| <b>The name of this cluster manager, the name is used to identify a | |
| session manager on a node. The name might get modified by the | |
| <code>Cluster</code> element to make it unique in the container.</b> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">notifyListenersOnReplication</code></td><td align="left" valign="center"> | |
| Set to <code>true</code> if you wish to have session listeners notified | |
| when session attributes are being replicated or removed across Tomcat | |
| nodes in the cluster. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">expireSessionsOnShutdown</code></td><td align="left" valign="center"> | |
| When a web application is being shutdown, Tomcat issues an expire call | |
| to each session to notify all the listeners. If you wish for all | |
| sessions to expire on all nodes when a shutdown occurs on one node, set | |
| this value to <code>true</code>. Default value is <code>false</code>. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">maxInactiveInterval</code></td><td align="left" valign="center"> | |
| <p><strong>Deprecated</strong>: This should be configured via the | |
| Context.</p> | |
| <p>The initial maximum time interval, in seconds, | |
| between client requests before a session is invalidated. A negative value | |
| will result in sessions never timing out. If the attribute is not provided, | |
| a default of 1800 seconds (30 minutes) is used.</p> | |
| <p>This attribute provides the initial value whenever a | |
| new session is created, but the interval may be dynamically | |
| varied by a servlet via the | |
| <code>setMaxInactiveInterval</code> method of the <code>HttpSession</code> object.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">sessionIdLength</code></td><td align="left" valign="center"> | |
| <p>The length of session ids created by this Manager, measured in bytes, | |
| excluding subsequent conversion to a hexadecimal string and | |
| excluding any JVM route information used for load balancing. | |
| The default is 16. You should set the length on a nested | |
| <strong>SessionIdGenerator</strong> element instead.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">processExpiresFrequency</code></td><td align="left" valign="center"> | |
| <p>Frequency of the session expiration, and related manager operations. | |
| Manager operations will be done once for the specified amount of | |
| backgroundProcess calls (i.e., the lower the amount, the more often the | |
| checks will occur). The minimum value is 1, and the default value is 6. | |
| </p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">secureRandomClass</code></td><td align="left" valign="center"> | |
| <p>Name of the Java class that extends | |
| <code>java.security.SecureRandom</code> to use to generate session IDs. | |
| If not specified, the default value is | |
| <code>java.security.SecureRandom</code>.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">secureRandomProvider</code></td><td align="left" valign="center"> | |
| <p>Name of the provider to use to create the | |
| <code>java.security.SecureRandom</code> instances that generate session | |
| IDs. If an invalid algorithm and/or provider is specified, the Manager | |
| will use the platform default provider and the default algorithm. If not | |
| specified, the platform default provider will be used.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">secureRandomAlgorithm</code></td><td align="left" valign="center"> | |
| <p>Name of the algorithm to use to create the | |
| <code>java.security.SecureRandom</code> instances that generate session | |
| IDs. If an invalid algorithm and/or provider is specified, the Manager | |
| will use the platform default provider and the default algorithm. If not | |
| specified, the default algorithm of SHA1PRNG will be used. If the | |
| default algorithm is not supported, the platform default will be used. | |
| To specify that the platform default should be used, do not set the | |
| secureRandomProvider attribute and set this attribute to the empty | |
| string.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">recordAllActions</code></td><td align="left" valign="center"> | |
| <p>Flag whether send all actions for session across Tomcat cluster | |
| nodes. If set to false, if already done something to the same attribute, | |
| make sure don't send multiple actions across Tomcat cluster nodes. | |
| In that case, sends only the actions that have been added at last. | |
| Default is <code>false</code>.</p> | |
| </td></tr></table> | |
| </blockquote></td></tr></table> | |
| <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.ha.session.DeltaManager Attributes"><!--()--></a><a name="org.apache.catalina.ha.session.DeltaManager_Attributes"><strong>org.apache.catalina.ha.session.DeltaManager Attributes</strong></a></font></td></tr><tr><td><blockquote> | |
| <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">expireSessionsOnShutdown</code></td><td align="left" valign="center"> | |
| When a web application is being shutdown, Tomcat issues an expire call | |
| to each session to notify all the listeners. If you wish for all | |
| sessions to expire on all nodes when a shutdown occurs on one node, set | |
| this value to <code>true</code>. | |
| Default value is <code>false</code>. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">maxActiveSessions</code></td><td align="left" valign="center"> | |
| The maximum number of active sessions that will be created by this | |
| Manager, or -1 (the default) for no limit. For this manager, all | |
| sessions are counted as active sessions irrespective if whether or not | |
| the current node is the primary node for the session. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">notifySessionListenersOnReplication</code></td><td align="left" valign="center"> | |
| Set to <code>true</code> if you wish to have session listeners notified | |
| when sessions are created and expired across Tomcat nodes in the | |
| cluster. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">notifyContainerListenersOnReplication</code></td><td align="left" valign="center"> | |
| Set to <code>true</code> if you wish to have container listeners notified | |
| across Tomcat nodes in the cluster. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">stateTransferTimeout</code></td><td align="left" valign="center"> | |
| The time in seconds to wait for a session state transfer to complete | |
| from another node when a node is starting up. | |
| Default value is <code>60</code> seconds. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">sendAllSessions</code></td><td align="left" valign="center"> | |
| Flag whether send sessions as split blocks. | |
| If set to <code>true</code>, send all sessions as one big block. | |
| If set to <code>false</code>, send sessions as split blocks. | |
| Default value is <code>true</code>. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">sendAllSessionsSize</code></td><td align="left" valign="center"> | |
| The number of sessions in a session block message. This value is | |
| effective only when <code>sendAllSessions</code> is <code>false</code>. | |
| Default is <code>1000</code>. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">sendAllSessionsWaitTime</code></td><td align="left" valign="center"> | |
| Wait time between sending of session block messages. This value is | |
| effective only when <code>sendAllSessions</code> is <code>false</code>. | |
| Default is <code>2000</code> milliseconds. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">sessionAttributeNameFilter</code></td><td align="left" valign="center"> | |
| <p>A regular expression used to filter which session attributes will be | |
| replicated. An attribute will only be replicated if its name matches | |
| this pattern. If the pattern is zero length or <code>null</code>, all | |
| attributes are eligible for replication. The pattern is anchored so the | |
| session attribute name must fully match the pattern. As an example, the | |
| value <code>(userName|sessionHistory)</code> will only replicate the | |
| two session attributes named <code>userName</code> and | |
| <code>sessionHistory</code>. If not specified, the default value of | |
| <code>null</code> will be used.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">sessionAttributeValueClassNameFilter</code></td><td align="left" valign="center"> | |
| <p>A regular expression used to filter which session attributes will be | |
| replicated. An attribute will only be replicated if the implementation | |
| class name of the value matches this pattern. If the pattern is zero | |
| length or <code>null</code>, all attributes are eligible for | |
| replication. The pattern is anchored so the fully qualified class name | |
| must fully match the pattern. If not specified, the default value of | |
| <code>null</code> will be used unless a <code>SecurityManager</code> is | |
| enabled in which case the default will be | |
| <code>java\\.lang\\.(?:Boolean|Integer|Long|Number|String)</code>.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">stateTimestampDrop</code></td><td align="left" valign="center"> | |
| When this node sends a <code>GET_ALL_SESSIONS</code> message to other | |
| node, all session messages that are received as a response are queued. | |
| If this attribute is set to <code>true</code>, the received session | |
| messages (except any <code>GET_ALL_SESSIONS</code> sent by other nodes) | |
| are filtered by their timestamp. A message is dropped if it is not a | |
| <code>GET_ALL_SESSIONS</code> message and its timestamp is earlier than | |
| the timestamp of our <code>GET_ALL_SESSIONS</code> message. | |
| If set to <code>false</code>, all queued session messages are handled. | |
| Default is <code>true</code>. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">warnOnSessionAttributeFilterFailure</code></td><td align="left" valign="center"> | |
| <p>If <strong>sessionAttributeNameFilter</strong> or | |
| <strong>sessionAttributeValueClassNameFilter</strong> blocks an | |
| attribute, should this be logged at <code>WARN</code> level? If | |
| <code>WARN</code> level logging is disabled then it will be logged at | |
| <code>DEBUG</code>. The default value of this attribute is | |
| <code>false</code> unless a <code>SecurityManager</code> is enabled in | |
| which case the default will be <code>true</code>.</p> | |
| </td></tr></table> | |
| </blockquote></td></tr></table> | |
| <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.ha.session.BackupManager Attributes"><!--()--></a><a name="org.apache.catalina.ha.session.BackupManager_Attributes"><strong>org.apache.catalina.ha.session.BackupManager Attributes</strong></a></font></td></tr><tr><td><blockquote> | |
| <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">mapSendOptions</code></td><td align="left" valign="center"> | |
| The backup manager uses a replicated map, this map is sending and | |
| receiving messages. You can setup the flag for how this map is sending | |
| messages, the default value is <code>6</code>(synchronous).<br> | |
| Note that if you use asynchronous messaging it is possible for update | |
| messages for a session to be processed by the receiving node in a | |
| different order to the order in which they were sent. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">maxActiveSessions</code></td><td align="left" valign="center"> | |
| The maximum number of active sessions that will be created by this | |
| Manager, or -1 (the default) for no limit. For this manager, only | |
| sessions where the current node is the primary node for the session are | |
| considered active sessions. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">rpcTimeout</code></td><td align="left" valign="center"> | |
| Timeout for RPC message used for broadcast and transfer state from | |
| another map. | |
| Default value is <code>15000</code> milliseconds. | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">sessionAttributeNameFilter</code></td><td align="left" valign="center"> | |
| <p>A regular expression used to filter which session attributes will be | |
| replicated. An attribute will only be replicated if its name matches | |
| this pattern. If the pattern is zero length or <code>null</code>, all | |
| attributes are eligible for replication. The pattern is anchored so the | |
| session attribute name must fully match the pattern. As an example, the | |
| value <code>(userName|sessionHistory)</code> will only replicate the | |
| two session attributes named <code>userName</code> and | |
| <code>sessionHistory</code>. If not specified, the default value of | |
| <code>null</code> will be used.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">sessionAttributeValueClassNameFilter</code></td><td align="left" valign="center"> | |
| <p>A regular expression used to filter which session attributes will be | |
| replicated. An attribute will only be replicated if the implementation | |
| class name of the value matches this pattern. If the pattern is zero | |
| length or <code>null</code>, all attributes are eligible for | |
| replication. The pattern is anchored so the fully qualified class name | |
| must fully match the pattern. If not specified, the default value of | |
| <code>null</code> will be used unless a <code>SecurityManager</code> is | |
| enabled in which case the default will be | |
| <code>java\\.lang\\.(?:Boolean|Integer|Long|Number|String)</code>.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">terminateOnStartFailure</code></td><td align="left" valign="center"> | |
| Set to true if you wish to terminate replication map when replication | |
| map fails to start. If replication map is terminated, associated context | |
| will fail to start. If you set this attribute to false, replication map | |
| does not end. It will try to join the map membership in the heartbeat. | |
| Default value is <code>false</code> . | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">warnOnSessionAttributeFilterFailure</code></td><td align="left" valign="center"> | |
| <p>If <strong>sessionAttributeNameFilter</strong> or | |
| <strong>sessionAttributeValueClassNameFilter</strong> blocks an | |
| attribute, should this be logged at <code>WARN</code> level? If | |
| <code>WARN</code> level logging is disabled then it will be logged at | |
| <code>DEBUG</code>. The default value of this attribute is | |
| <code>false</code> unless a <code>SecurityManager</code> is enabled in | |
| which case the default will be <code>true</code>.</p> | |
| </td></tr><tr><td align="left" valign="center"><code class="attributeName">accessTimeout</code></td><td align="left" valign="center"> | |
| The timeout for a ping message. If a remote map does not respond within | |
| this timeout period, its regarded as disappeared. | |
| Default value is <code>5000</code> milliseconds. | |
| </td></tr></table> | |
| </blockquote></td></tr></table> | |
| </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Nested Components"><!--()--></a><a name="Nested_Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote> | |
| <h3>All Manager Implementations</h3> | |
| <p>All Manager implementations allow nesting of a | |
| <strong><SessionIdGenerator></strong> element. It defines | |
| the behavior of session id generation. All implementations | |
| of the <a href="sessionidgenerator.html">SessionIdGenerator</a> allow the | |
| following attributes: | |
| </p> | |
| <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">sessionIdLength</code></td><td align="left" valign="center"> | |
| <p>The length of the session ID may be changed with the | |
| <strong>sessionIdLength</strong> attribute. | |
| </p> | |
| </td></tr></table> | |
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