Hi,

My enviroment is
Hibernate Core : 3.2.6GA
Hibernate Search: 3.0.1GA

I'm deploying load balance with 2 tomcats and share 1 directory for index storing. And a problem occured which I thought shouldn't happen:
when stress testing, "Lock obtain timed out" exception is thrown out when there are only 10 concurrent threads.

How could I do with it? Thanks in advance.

you mean 2 tomcats on the same machine, or how is this index being shared?

Not on same machine, one tomcat per server. Use Apache to implement load balance.Index is on a RAID.
Thank you for the reply.

So how is this index shared? are you using NFS? The use of NFS or other network filesystem to share the index is not recommended, look at the Lucene forums: you'll find lots of problems.

In Search each index write operation needs the lock, then it guarantees to release it after the operation, but there is no notion of a "fair lock across machines", so under load it is probably re-acquiring the lock right after, so node2 never happens to "see" the lock available and after many failures it times out.

You'll find more insight and many solutions in the book.

Hi friends, it was a nice information. Thanks for sharing.