I'm currently learning Tomcat clustering these days. I setup 4 Tomcat-6.0.22 instances in Windows XP: server1, server2, server3, server4 cluster1: server1 & server2 (228.0.0.4:45564) cluster2: server3 & server4 (228.0.0.4:45566)
Apache/2.2.14(win32) is the frontend. mod_jk-1.2.28 is the connector between Apache and Tomcats. Start tomcats, start apache, then I visit http://localhost/tomcatClusterTest/session-test.jsp 4 times, then I saw each tomcat server got a request. What I expected is: server1 should get request #1,#3. server2 should get request #2,#4. server3 and server4 should get no request because they are another cluster and so they do not have the session which is created at server1. I read the comments of "Bug 32317 - Making mod_jk replication aware (Clustering Support)" from here https://issues.apache.org/bugzilla/show_bug.cgi?id=32317 I saw the following comment in bug description: ------------------------------------------------------------------------------- - without stickyness to decide to which workers an existing session is allowed to be balanced (all workers with the same domain as the worker given in the session id) ------------------------------------------------------------------------------- The comment is what I expected, but the test result is unexpected: server3 & server4 which belongs another domain/cluster are picked. Is it a bug or I misunderand the meaning of the comment above? workers.properties: #------------------------------------------------------------------------------- worker.list=LoadBalancer worker.LoadBalancer.type=lb worker.LoadBalancer.balance_workers=server1,server2,server3,server4 worker.LoadBalancer.sticky_session=false worker.server1.host=localhost worker.server1.port=8109 worker.server1.type=ajp13 worker.server1.lbfactor=1 worker.server1.domain=cluster1 worker.server2.host=localhost worker.server2.port=8209 worker.server2.type=ajp13 worker.server2.lbfactor=1 worker.server2.domain=cluster1 worker.server3.host=localhost worker.server3.port=8309 worker.server3.type=ajp13 worker.server3.lbfactor=1 worker.server3.domain=cluster2 worker.server4.host=localhost worker.server4.port=8409 worker.server4.type=ajp13 worker.server4.lbfactor=1 worker.server4.domain=cluster2 #------------------------------------------------------------------------------- httpd.conf #------------------------------------------------------------------------------- JkMount /tomcatClusterTest/* LoadBalancer #... #------------------------------------------------------------------------------- session-test.jsp ------------------------------------------------------------------------------- <%@ page contentType='text/html' pageEncoding='GBK' %> <pre style='font-size: 12px;'> <% String sUserName=(String)session.getAttribute ("username"); Integer oRequestCounter=(Integer)session.getAttribute ("request counter"); int iRequestCounter = oRequestCounter!=null ? oRequestCounter.intValue() : 0; iRequestCounter ++; session.setAttribute ("request counter", Integer.valueOf(iRequestCounter)); java.sql.Timestamp oSessionCreatedTime = new java.sql.Timestamp(session.getCreationTime()); java.sql.Timestamp oSessionLastAccessedTime = new java.sql.Timestamp(session.getLastAccessedTime()); String sSessionID = session.getId (); java.sql.Timestamp currentTimestamp=new java.sql.Timestamp(System.currentTimeMillis()); String sInfo = "-------------------------------------------\n" + "Request: # " +iRequestCounter + "\n" + " Time: " + currentTimestamp + "\n" + "Session:\n" + " ID " + sSessionID + "\n" + " Created " + oSessionCreatedTime + "\n" + " Accessed " + oSessionLastAccessedTime + "\n" + " Attribute: username = " + sUserName + "\n" + " Attribute: request counter = " + session.getAttribute ("request counter") + "\n" + "" ; System.out.println (sInfo); out.println (sInfo); if (sUserName==null) { session.setAttribute ("username", "MyName "+new java.sql.Time(System.currentTimeMillis())); } %> </pre> ------------------------------------------------------------------------------- My test result: server1: ------------------------------------------- Request: # 1 Time: 2010-01-05 16:01:10.687 Session: ID 7E5BAD3313EF518C189B1237E7475D74.server1 Created 2010-01-05 16:01:10.687 Accessed 2010-01-05 16:01:10.687 Attribute: username = null Attribute: request counter = 1 server2: ------------------------------------------- Request: # 2 Time: 2010-01-05 16:01:12.828 Session: ID 7E5BAD3313EF518C189B1237E7475D74.server2 Created 2010-01-05 16:01:10.687 Accessed 2010-01-05 16:01:10.687 Attribute: username = MyName 16:01:10 Attribute: request counter = 2 server3: ------------------------------------------- Request: # 1 Time: 2010-01-05 16:01:14.343 Session: ID 46F2C9DA30599FF835358D50682E7583.server Created 2010-01-05 16:01:14.343 Accessed 2010-01-05 16:01:14.343 Attribute: username = null Attribute: request counter = 1 server4: ------------------------------------------- Request: # 2 Time: 2010-01-05 16:01:15.0 Session: ID 46F2C9DA30599FF835358D50682E7583.server4 Created 2010-01-05 16:01:14.343 Accessed 2010-01-05 16:01:14.359 Attribute: username = MyName 16:01:14 Attribute: request counter = 2 -- View this message in context: http://old.nabble.com/mod_jk%3A-The-worker-pick-order-scope-when-sticky_session%3Dfalse-and-clusters-are-grouped-by-worker.domain-tp27025276p27025276.html Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
