Re: Load balancing DeltaManager problem.

Scott Gray Wed, 04 Nov 2009 03:31:20 -0800

Hi Anil,

I can't answer your question (I don't know enough about session replication) except to say that the API for DeltaManager says that it is the optimal way to handle the replication.

Based on the error below my first guess as to the problem would be that you are running the instances of different jvm implementations/ versions and they are creating different serialVersionUIDs for the same class, hence the incompatibility error. Either that or the two classes are actually different in some way. You could work around the problem by hardcoding the serialVersionUIDs so that they are the same (or at least try it to test the theory). If that works then I'd suggest digging in deeper around the actual cause of the issue i.e. why the serialVersionUIDs different?


Regards
Scott

HotWax Media
http://www.hotwaxmedia.com

On 5/11/2009, at 12:08 AM, Anil Soni wrote:

I was doing load balancing using two OFBiz servers in Session Replication

mode with Apache HTTP Server.

Servers run properly in load balanced mode, If I shut down one server in

the middle of browser session, the other OFBiz server continues the

browser session without any problem. User login information also persistes in the session, so the second server does not ask for login again. But

when I go for placing the order, and close the server in middle of the

check out process, rest all the details persist but cart comes out to be empty , and if there is some promotional item present in the cart, that

promotional item persists inside the cart when second server continues
browser session but all the other items get removed.

And I was getting this exception :

2009-10-29 12:06:49,971 (pool-2-thread-6) [ DeltaManager.java: 1329:ERROR]

Manager [/ordermgr]: Unable to receive message through TCP channel

java.io.InvalidClassException: org.ofbiz.order.shoppingcart.ShoppingCart;

local class incompatible: stream classdesc serialVersionUID =
326289553356146708, local class serialVersionUID = -202274068516513625
       at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
       at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
       at java.io.ObjectInputStream.readClassDesc(Unknown Source)
       at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
       at java.io.ObjectInputStream.readClassDesc(Unknown Source)
       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
       at java.io.ObjectInputStream.readObject0(Unknown Source)
       at java.io.ObjectInputStream.readObject(Unknown Source)
       at javolution.util.FastMap.readObject(Unknown Source)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)


       at java.lang.reflect.Method.invoke(Unknown Source)
       at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)
       at java.io.ObjectInputStream.readSerialData(Unknown Source)
       at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
       at java.io.ObjectInputStream.readObject0(Unknown Source)
       at java.io.ObjectInputStream.readObject(Unknown Source)
       at

org.apache.catalina.ha.session.DeltaRequest $AttributeInfo.readExternal(DeltaRequest.java:361)

at

org .apache .catalina.ha.session.DeltaRequest.readExternal(DeltaRequest.java:255)

at

org .apache .catalina .ha.session.DeltaManager.deserializeDeltaRequest(DeltaManager.java: 619)


       at

After some debugging I found that It was problem of DeltaManager, so I
used BackupManager as manager-class and set the value of
apps-distributable="true" and apps-cross-context="true".After these
settings load balancing in replication mode is working properly.

Now my question is that that why we are using DeltaManager as
manager-class in ofbiz-containers.xml ?



Thanks & Regards,
Anil Soni
[email protected]
Tel : 91-22-6795 4324
Mobile : 9930302283

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Re: Load balancing DeltaManager problem.

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