Memory problem at repeated remote PUT
-------------------------------------
Key: JBCACHE-93
URL: http://jira.jboss.com/jira/browse/JBCACHE-93
Project: JBoss Cache
Type: Bug
Versions: 1.2
Environment: * Windows cluster with two W2K servers, 2 JVMs per server
* JDK 1.4.2_05
* Application server is Oracle 9.0.3 AS
* one database server (Oracle)
Reporter: Henrik Nyberg
Assigned to: Bela Ban
JBossCache does not properly garbage collect objects that are replicated
through the network and that replaces an already existing object in the local
cache. The existing local cache object that is being replaced by the remote PUT
is not garbage collected.
We have four caches in our setup, A, B, C, D. We describe the status for cache
A after the first iteration using an object sA1. We PUT that object after every
iteration into A using the same key ksA.
Iteration 1:
A updates status -> A(ksA,sA1) replicated to => B(ksA, sA1), C(ksA, sA1),
D(ksA, sA1)
Iteration 2:
A updates status -> A(ksA,sA2) replicated to => B(ksA, sA2), C(ksA, sA2),
D(ksA, sA2)
After iteration 2 the local object A(ksA,sA1) is probably correctly gc:ed,
since if we run this test in local mode the cache works reliably. The remote
objects B(ksA, sA1), C(ksA, sA1), D(ksA, sA1) however seem not to be correctly
gc:ed since the cache constantly eats memory when running in replicated mode.
If we turn off the status replication, i.e. the repeated PUT of the status
object A(ksA, saN), the cache works like a charm. The only difference between
the two test cases is the PUT.
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