[JCS-82] Lateral Cache does not work with multiple writes to same object: OOS does not get reset

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: jcs-1.3
• Fix Version/s: jcs-2.0-beta-1
• Component/s: TCP Lateral Cache
• Labels: OOS cache jcs lateral reset_frequency
• Environment: JDK1.6 ; ALL Operating Systems
• Assignee: Aaron Smuts
• Reporter: Nikunj Trivedi
• Created: 05/Aug/11 10:23
• Updated: 01/Apr/15 14:51
• Resolved: 30/Oct/11 21:02

Description

In a Lateral cache environment, If a mutable object is written to JCS multiple times, only original copy is written every time by ObjectOutputStream of LateralTCPSender.
This seems to be a known issue as per some forums, but not fixed since it could not be replicated.

My case is as follows: Server A & B has a common mutable object (say StringBuffer) in cache.
JDK1.6 Server A:
StringBuffer obj=new StringBuffer("Initial");
jcs.put("key",obj);//This is visible to Server B
obj.append("Append");
jcs.put("key",obj);//This gets ignored, B still sees obj="Initial"

I recompiled with LateralTCPSender.RESET_FREQUENCY from 70 to 1, it works fine.

I suggest, either RESET_FREQUENCY should be 1 or use oos.writeUnshared.

Issue Links

• is related to: JCS-93 RMI Remote cache update events not getting propagated to JCS clients on Solaris.
• is related to: JCS-135 Remote JCS Implemented