Re: [infinispan-dev] PutForExternalRead and autoCommit

It's on my TODO list to create a wiki on it: https://issues.jboss.org/browse/ISPN-1120 The javadoc should be clear enough but basically, it's a put operation geared towards best-effort, when you're trying to put somewhere read from an external source. http://www.slideshare.net/galderz/infinispan-for-dummies - slide 12 for characteristics of a PFER as opposed to a Put On Nov 17, 2011, at 9:36 AM, Sanne Grinovero wrote: > Hi Galder, > could you explain some details of the use case / requirements of > putForExternalRead ? I'm assuming you're talking about the Hibernate > 2nd level cache, but I don't know exactly how that is designed, do we > have some documentation about it? > > Cheers, > Sanne > > On 17 November 2011 09:30, Galder Zamarreño <galder.zamarreno(a)redhat.com&gt; wrote: >> Hi, >> >> Forcing caches to be either transactional or non transactional caches causes some issues with operations such as putForExternalRead with default configuration options. >> >> Assuming we have a transactional cache, if autoCommit is on (default), putForExternalRead will: >> 1. Suspend the ongoing transaction >> 2. Will create a brand new transaction due to implicit transaction creation logic in auto commit. >> >> This is not good. >> >> I don't think we can just disable autoCommit globally if someone calls putForExternalRead because there might other operations not called within a transaction, but there's a point to be made here: >> The whole point of calling PFER is to suspend on-going transactions, so it kinda implies that transactions are managed externally already. >> >> If we don't disable autoCommit globally, there's a few things that we should consider doing: >> 1. Print a WARN if PFER is called and autoCommit is on? >> 2. Apart from the message, some kind of way for putForExternalRead to instruct the implicit transaction logic to avoid creating a new transaction in this case. >> >> WDYT? >> -- >> Galder Zamarreño >> Sr. Software Engineer >> Infinispan, JBoss Cache >> >> >> _______________________________________________ >> infinispan-dev mailing list >> infinispan-dev(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/infinispan-dev >> > > _______________________________________________ > infinispan-dev mailing list > infinispan-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/infinispan-dev -- Galder Zamarreño Sr. Software Engineer Infinispan, JBoss Cache _______________________________________________ infinispan-dev mailing list infinispan-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/infinispan-dev