3 Replies Latest reply on Jun 15, 2010 2:05 PM by galder.zamarreno

Help needed with repeatable read Atomikos 3.6.5/JBoss Cache 3.2.1

bm4499 Apr 28, 2010 8:59 AM

Hi everyone,

I'm trying to get a minimal example of JBoss Cache and repeatable reads running.
I want to do what is described under "Repeatable-Read Example" at http://community.jboss.org/wiki/JBossCacheMVCC

I'm using Atomikos EssentialTransactions 3.6.5 as transaction manager and JBoss Cache 3.2.1 GA.
My code and its output is attached. What I want to see is that thread number 2 which I have
artificially delayed also reads the value 0, however, it says

#2 193999500851447 before put: 1

so it accesses the value modified by thread #1 although thread #2's transaction started before
thread #1 commits its modified value.

Can anyone tell me what I'm missing?

Thanks in advance!
-- BM

output.txt.zip 1.2 KB
AtomikosTransactionManagerLookup.java.zip 383 bytes
ConcurrencyTestAtomikos.java.zip 944 bytes

1. Re: Help needed with repeatable read Atomikos 3.6.5/JBoss Cache 3.2.1

galder.zamarreno May 3, 2010 12:45 PM (in response to bm4499)

Two things to try here:
- Upgrade to latest JBoss Cache 3.2.4.GA since it contains fixes to concurrency issues like https://jira.jboss.org/jira/browse/JBCACHE-1555
- Try JBoss Transactions as transaction manager rather than Atomikos. We don't test with the latter.
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2. Re: Help needed with repeatable read Atomikos 3.6.5/JBoss Cache 3.2.1

feci Jun 10, 2010 5:21 PM (in response to galder.zamarreno)

Well, than I gues, statements in FAQ and documenttion like:

JBoss Cache supports any TransactionManager that is JTA compliant such asJBoss Transactions.
or
- being able to participate in JTA transactions (works with most Java EE compliant transaction managers).

are just advertisements :-)
As what I know, Atomikos has some pretty good JTA compliant solution (and even JTA/XA)...
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3. Re: Help needed with repeatable read Atomikos 3.6.5/JBoss Cache 3.2.1

galder.zamarreno Jun 15, 2010 2:05 PM (in response to feci)

Tomas, I appreciate your comment although I think it would be a lot more constructive if you could spend some time ironing differences between Atomikos and JBoss Cache
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