On Nov 14, 2013, at 1:20 PM, Pedro Ruivo <pedro(a)infinispan.org> wrote:
Hi,
Simple question: shouldn't PFER ensure some consistency?
I know that PFER is asynchronous but (IMO) it can create inconsistencies
in the data. the primary owner replicates the PFER follow by a PUT (PFER
is sent async log the lock is released immediately) for the same key, we
have no way to be sure if the PFER is delivered after or before in all
the backup owners.
comments?
Assuming that PFER and PUT happen in the same thread, we're normally relying on the
JGroups sequence of events to send the first, wait no response, and then send the second
put. That should guarantee order in which puts are received in the other nodes, but after
that yeah, there's a risk that it could happen. PFER and PUT for a given key normally
happen in the same thread in cache heavy use cases such as Hibernate 2LC, but there's
no guarantee.
Cheers,
Pedro
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Galder Zamarreño
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