Hi,
i just downloaded the new 1.2.3 version, replacing a 1.2.2 version for a
project still in development. This project uses JBossCache in a standalone
configuration the replicate data between a couple of clients, alias using it as
a classical distributed shared memory system.
Without changing anything at configuration or code I notice two major
differences.
1. With the old version I always got an error message like this: "ERROR
org.jboss.cache.TreeCache - failed binding to JNDI as
{locatorURI=socket://:5555, name=DefaultCache}, exception=Need to specify class
name in environment or system property, or as an applet parameter, or in an
application resource file: java.naming.factory.initial"
This disappeared just in 1.2.3. As I just started with JBossCache this is
something I wanted to ask anyway ,-)) But I don't know if the problem has
really disappeared with 1.2.3 or just doesn't show up as an error message as I
don't know what the original problem was.
The configurtation directive (default from the jboss-archive) looks like this:
<attribute name="JndiName">
| name=DefaultCache
| locatorURI=socket://:5555
| </attribute>
2. I noticed a change in the locking strategy? Currently the cache uses
REPEATABLE_READ (default) as IsolationLevel. I noticed that a thread, reading
or writing to a node did not release locks automatically after reading/writing,
leading to a fast death of the application caused by hundreds of locks. I tried
to insert releaseAllLocks(node)-statements after each write but this didn't
help as nothing happend at all: I just saw my processes now consuming 100% CPU
(probably doing some spin-locking).
It should be added that we don't use the transactional features using any
external transaction manager of the JBossCache but want to rely completely on
the built features of J.
I finally changed the IsolationLevel to NONE and now everything works fine -
although I expect some problems later on in production when we'll see heavy
concurrent modifications happen.
Best regards,
Soeren Gerlach
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