Re: [infinispan-dev] locking optimisations reloaded
On May 24, 2011, at 11:36 PM, Mircea Markus wrote:
Hi,
This is re: http://community.jboss.org/wiki/PossibleLockingImprovements
I've created JIRAs for the locking optimisations as follows:
#1: https://issues.jboss.org/browse/ISPN-1131
For #1, how do you handle this case? (both threads on same node)
1. Thread-1: does a transactional write on key=K1, value=A
2. Thread-2: non-transactional write on key=K1, value=B // not a problem since Thread-1
has not yet acquired WL
3. Thread-1: prepares, acquires a WL on K1, an overrides key=K1 to contain value=A ?
Since Thread-1 does not acquire WL on the write, concurrent non-transactional writes could
be lost, couldn't they?
#2: this seems to be just a particular case of #4
#3: https://issues.jboss.org/browse/ISPN-1132
#4: https://issues.jboss.org/browse/ISPN-1137
#5: I think this is pretty much the same thing as #4, waiting for Sanne to confirm that.
Each JIRA also contains the design I have in mind for implementing them.
I do think this will improve the transactional throughput *significantly*, so any
feedback much appreciated.
Cheers,
Mircea
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Galder Zamarreño
Sr. Software Engineer
Infinispan, JBoss Cache