[jboss-user] [JBossCache] - org.jboss.cache.lock.TimeoutException: write lock for / coul
Hi all,
I'm trying to use JBoss Cache with optimistic locking as 2nd level cache for
hibernate. I have a test case where a multi-threaded client inserts new objects into the
database, with a database auto-sequence primary key. My test case passes with no issues
when using pessimistic locking, but as soon as I switch to optimistic locking, I get the
following:
17:47:25,831 WARN [TreeCache] replication failure with method_call optimisticPrepare;
id:18(GlobalTransaction:<172.31.100.1:34099>:14, [_put;
id:38(GlobalTransaction:<172.31.100.1:34099>:14,
/EntityBean_jar,SimpleEntityBean/com/intuit/spc/bhp/entity/SimpleEntityBean/com.intuit.spc.bhp.entity.SimpleEntityBean#3144,
item, CacheEntry(com.intuit.spc.bhp.entity.SimpleEntityBean)[Thu Nov 29 17:47:10 PST
2007,1234567890], true,
org.jboss.ejb3.entity.OptimisticJBCCache$DataVersionAdapter@1e3e4c5 [current=Thu Nov 29
17:47:10 PST 2007, previous=null,
src=SingleTableEntityPersister(com.intuit.spc.bhp.entity.SimpleEntityBean)])], null,
172.31.100.1:34099, false) exception
org.jboss.cache.lock.TimeoutException: failure acquiring lock: fqn=/,
caller=GlobalTransaction:<172.31.100.1:34099>:14, lock=write
owner=GlobalTransaction:<172.31.100.1:34101>:14 (activeReaders=0,
activeWriter=WorkerThread#3[127.0.0.1:38225], waitingReaders=0, waitingWriters=1,
waitingUpgrader=0)
Please note that I have 4 client threads (JMeter) sending requests in through a JSP that
calls an SLSB, but there should be no concurrency issue, given that all request amount to
database inserts and it's the same entity bean for all of them, thereby making the
cache objects peers (one is not the parent of another). The error message implies that the
cache is writing or updating something at the root, but I don't know why that would
be.
My SLSB code looks like this:
SimpleEntityBean entityBean = new SimpleEntityBean();
entityBean.setTimestamp(Calendar.getInstance().getTime());
em.persist(entityBean);
return entityBean.getId();
Your thoughts / suggestions would be greatly appreciated!
Thanks, Babak
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