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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: problem with clustering using Tomcat 4.1
Date Mon, 30 Jun 2003 16:19:33 GMT

Howdy,
No, YOU have fun Senor Hanik ;)  Congratulations!!!

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Filip Hanik [mailto:mail@filip.net]
>Sent: Monday, June 30, 2003 12:17 PM
>To: Tomcat Users List
>Cc: Sanjeev.Das@kanisa.com
>Subject: RE: problem with clustering using Tomcat 4.1
>
>send complete info, configurations and complete logs.
>I'm going on my honey moon, be back in three weeks.
>
>have fun!
>filip
>
>> -----Original Message-----
>> From: Das, Sanjeev [mailto:Sanjeev.Das@kanisa.com]
>> Sent: Friday, June 27, 2003 2:11 PM
>> To: mail@filip.net
>> Cc: tomcat-user@jakarta.apache.org
>> Subject: problem with clustering using Tomcat 4.1
>>
>>
>> Hello Filip,
>>
>> I have been trying to use your session replication libs in tomcat
>> 4.1 and have run into problems. I was wondering if you could help
>> me out here. I am trying the replication with a simple jsp page
>> on a one box setup with two instances of tomcat running.
>>
>> The jsp page simply prints out the session id and the cookies it
>> has received. Here is the text of the JSP page:
>>
>> <%@ page import="javax.servlet.http.*" %>
>> <HTML>
>> <BODY>
>> Server: ONE
>> <p/>
>>
>>
>> <%
>> if (request.getSession().isNew())
>> {
>> %>
>>
>> This is a new session.
>>
>> <%
>> }
>> else
>> {
>> %>
>> This is an old session.
>> <%
>> }
>> %>
>>
>> <p/>
>>
>> The session id : <%=request.getSession().getId()%>
>>
>>
>> <b>Cookies:</b><br/>
>>
>> <%
>> Cookie[] cookies = request.getCookies();
>> if (cookies != null)
>> {
>> 	for (int i=0; i < cookies.length; i++)
>> 	{
>> 	%>
>>
>> 	<b>Domain:</b><br/>
>> 	<%=cookies[i].getDomain()%><br/>
>>
>> 	<b>Name:</b><br/>
>> 	<%=cookies[i].getName()%><br/>
>>
>> 	<b>Value:</b><br/>
>> 	<%=cookies[i].getValue()%><br/>
>>
>> 	<b>Path:</b><br/>
>> 	<%=cookies[i].getPath()%><br/>
>>
>> 	<b>MaxAge:</b><br/>
>> 	<%=cookies[i].getMaxAge()%><br/>
>>
>>
>> 	<%
>> 	}
>> }
>> %>
>> </BODY>
>> </HTML>
>>
>> The pages in the two instances are exactly the same except that
>> one says SERVER ONE and the other SERVER TWO so that I can
>> distinguish between the two. I believe I have setup the Context
>> properly for both the instances.
>>
>> I am using Apache to do the round robin scheduling using mod_jk.
>>
>>
>> When I hit the page and look at the message in the two tomcat
>> consoles I get the following:
>>
>> first console:
>>
>> [InMemoryReplicationManager] Replicated Session created at
>> org.apache.catalina.c
>> luster.mcast.McastMember[tcp://172.17.1.106:4001,172.17.1.106,4001
>> ] with ID=6B5C
>> F3C232D4D8636D14586083E0B094
>> [InMemoryReplicationManager] writeObject() storing session
>> 6B5CF3C232D4D8636D145
>> 86083E0B094
>> [InMemoryReplicationManager] Replication Statistics
>>         Messages sent=2
>>         Message serialization time=31
>>         Average serialization time=15.5ms
>>         Average session send  size=805.0
>>         Messages received=0
>>         Message deserialization time=0
>>         Average deserialization time=NaNms
>>         Average message  delay  time=NaNms
>>
>> second console:
>> [InMemoryReplicationManager]
>> InMemoryReplicationManager.messageDataReceived(): r
>> eceived message
>> [InMemoryReplicationManager] Received SessionMessage of
>> type=SESSION-CREATED
>> [InMemoryReplicationManager] Replicated session received
>> ID=6B5CF3C232D4D8636D14
>> 586083E0B094
>> [InMemoryReplicationManager] readObject() loading session
>> 6B5CF3C232D4D8636D1458
>> 6083E0B094
>> [InMemoryReplicationManager] Replicated session
>> received=ReplicatedSession id=6B
>> 5CF3C232D4D8636D14586083E0B094
>> ref=StandardSession[6B5CF3C232D4D8636D14586083E0B
>> 094]
>>         LastAccess=1056747084419
>>
>> [InMemoryReplicationManager] Replication Statistics
>>         Messages sent=1
>>         Message serialization time=16
>>         Average serialization time=16.0ms
>>         Average session send  size=491.0
>>         Messages received=2
>>         Message deserialization time=46
>>         Average deserialization time=23.0ms
>>         Average message  delay  time=15.5ms
>>
>> It seems like the first box created the session and it was
>> replicated properly in the second box.
>>
>> Now when I reload the page and the request goes to the second box
>> I would expect the same session id to be printed out. Instead I
>> get the following output from the jsp page:
>>
>> Server: TWO
>> This is a new session.
>> The session id : E086477BF76F98820020F3FA7048C5E8 Cookies:
>> Domain:
>> null
>> Name:
>> JSESSIONID
>> Value:
>> 6B5CF3C232D4D8636D14586083E0B094
>> Path:
>> null
>> MaxAge:
>> -1
>>
>> The second server did receive the right JSESSIONID
>> (6B5CF3C232D4D8636D14586083E0B094) but decided to create a new
>> session instead of the replicated one.
>>
>> Do you have any ideas as to why this occur?
>>
>> thanks
>>
>> Sanjeev
>>
>>
>>
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>>
>>
>
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