Author: kkolinko
Date: Sun Jul 19 01:17:02 2009
New Revision: 795458
URL: http://svn.apache.org/viewvc?rev=795458&view=rev
Log:
Rewrote (reworded) the Javadoc comment for JvmRouteBinderValve class.
Modified:
tomcat/tc6.0.x/trunk/ (props changed)
tomcat/tc6.0.x/trunk/java/org/apache/catalina/ha/session/JvmRouteBinderValve.java
Propchange: tomcat/tc6.0.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Sun Jul 19 01:17:02 2009
@@ -1 +1 @@
-/tomcat/trunk:601180,606992,612607,630314,640888,652744,653247,673796,673820,683982,684001,684081,684234,684269-684270,685177,687503,687645,689402,690781,691392,691805,692748,693378,694992,695053,695311,696780,696782,698012,698227,698236,698613,699427,699634,701355,709294,709811,709816,710063,710066,710125,710205,711126,711600,712461,712467,718360,719119,719124,719602,719626,719628,720046,720069,721040,721286,721708,721886,723404,723738,726052,727303,728032,728768,728947,729057,729567,729569,729571,729681,729809,729815,729934,730250,730590,731651,732859,732863,734734,740675,740684,742677,742697,742714,744160,744238,746321,746384,746425,747834,747863,748344,750258,750291,750921,751286-751287,751289,751295,753039,757335,757774,758365,758596,758616,758664,759074,761601,762868,762929,762936-762937,763166,763183,763193,763228,763262,763298,763302,763325,763599,763611,763654,763681,763706,764985,764997,765662,768335,769979,770716,770809,770876,776921,776924,776935,776945,777464,77
7466,777576,777625,778379,778523-778524,781528,781779,782145,782791,783316,783696,783724,783756,783762,783766,783863,783934,784453,784602,784614,785381,785688,785768,785859,786468,786487,786490,786496,786667,787627,787770,787985,790405,791041,791184,791194,791243,791326,791328,791789,792740,793372,793757,793882,793981,794822,795043
+/tomcat/trunk:601180,606992,612607,630314,640888,652744,653247,673796,673820,683982,684001,684081,684234,684269-684270,685177,687503,687645,689402,690781,691392,691805,692748,693378,694992,695053,695311,696780,696782,698012,698227,698236,698613,699427,699634,701355,709294,709811,709816,710063,710066,710125,710205,711126,711600,712461,712467,718360,719119,719124,719602,719626,719628,720046,720069,721040,721286,721708,721886,723404,723738,726052,727303,728032,728768,728947,729057,729567,729569,729571,729681,729809,729815,729934,730250,730590,731651,732859,732863,734734,740675,740684,742677,742697,742714,744160,744238,746321,746384,746425,747834,747863,748344,750258,750291,750921,751286-751287,751289,751295,753039,757335,757774,758365,758596,758616,758664,759074,761601,762868,762929,762936-762937,763166,763183,763193,763228,763262,763298,763302,763325,763599,763611,763654,763681,763706,764985,764997,765662,768335,769979,770716,770809,770876,776921,776924,776935,776945,777464,77
7466,777576,777625,778379,778523-778524,781528,781779,782145,782791,783316,783696,783724,783756,783762,783766,783863,783934,784453,784602,784614,785381,785688,785768,785859,786468,786487,786490,786496,786667,787627,787770,787985,790405,791041,791184,791194,791243,791326,791328,791789,792740,793372,793757,793882,793981,794822,795043,795457
Modified:
tomcat/tc6.0.x/trunk/java/org/apache/catalina/ha/session/JvmRouteBinderValve.java
URL:
http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/ha/session/JvmRouteBinderValve.java?rev=795458&r1=795457&r2=795458&view=diff
==============================================================================
---
tomcat/tc6.0.x/trunk/java/org/apache/catalina/ha/session/JvmRouteBinderValve.java
(original)
+++
tomcat/tc6.0.x/trunk/java/org/apache/catalina/ha/session/JvmRouteBinderValve.java
Sun Jul 19 01:17:02 2009
@@ -46,40 +46,52 @@
/**
* Valve to handle Tomcat jvmRoute takeover using mod_jk module after node
- * failure. After a node crashed the next request going to other cluster node.
- * Now the answering from apache is slower ( make some error handshaking. Very
- * bad with apache at my windows.). We rewrite now the cookie jsessionid
- * information to the backup cluster node. After the next response all client
- * request goes direct to the backup node. The change sessionid send also to
all
- * other cluster nodes. Well, now the session stickyness work directly to the
- * backup node and traffic don't go back too restarted cluster nodes!
+ * failure. After a node crashes, subsequent requests go to other cluster
nodes.
+ * That incurs a drop in performance. When this Valve is enabled on a backup
+ * node and sees a request, which was intended for another (thus failed) node,
+ * it will rewrite the cookie jsessionid information to use the route to this
+ * backup cluster node, that answered the request. After the response is
+ * delivered to the client, all subsequent client requests will go directly to
+ * the backup node. The change of sessionid is also sent to all other cluster
+ * nodes. After all that, the session stickyness will work directly to the
+ * backup node and the traffic will not go back to the failed node after it is
+ * restarted!
*
- * At all cluster node you must configure the as ClusterListener since 5.5.10
- * {...@link org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener
JvmRouteSessionIDBinderListener}
- * or before with
- * org.apache.catalina.ha.session.JvmRouteSessionIDBinderListenerLifecycle.
+ * <p>
+ * For this valve to function correctly, so that all nodes of the cluster
+ * receive the sessionid change notifications that it generates, the following
+ * ClusterListener MUST be configured at all nodes of the cluster:
+ * {...@link org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener
+ * JvmRouteSessionIDBinderListener} since Tomcat 5.5.10, and both
+ * JvmRouteSessionIDBinderListener and JvmRouteSessionIDBinderLifecycleListener
+ * for earlier versions of Tomcat.
*
+ * <p>
* Add this Valve to your host definition at conf/server.xml .
*
* Since 5.5.10 as direct cluster valve:<br/>
+ *
* <pre>
* <Cluster>
* <Valve
className="org.apache.catalina.ha.session.JvmRouteBinderValve" />
* </Cluster>
* </pre>
+ *
* <br />
* Before 5.5.10 as Host element:<br/>
+ *
* <pre>
- * <Hostr>
+ * <Host>
* <Valve
className="org.apache.catalina.ha.session.JvmRouteBinderValve" />
- * </Hostr>
+ * </Host>
* </pre>
*
- * Trick:<br/>
- * You can enable this mod_jk turnover mode via JMX before you drop a node to
all backup nodes!
- * Set enable true on all JvmRouteBinderValve backups, disable worker at
mod_jk
- * and then drop node and restart it! Then enable mod_jk Worker and disable
JvmRouteBinderValves again.
- * This use case means that only requested session are migrated.
+ * <em>A Trick:</em><br/>
+ * You can enable this mod_jk turnover mode via JMX before you drop a node to
+ * all backup nodes! Set enable true on all JvmRouteBinderValve backups,
disable
+ * worker at mod_jk and then drop node and restart it! Then enable mod_jk
worker
+ * and disable JvmRouteBinderValves again. This use case means that only
+ * requested sessions are migrated.
*
* @author Peter Rossbach
* @version $Revision$ $Date$
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