Adding dev only for this thread. On Wed, Feb 1, 2017 at 4:39 AM, Kant Kodali <k...@peernova.com> wrote:
> What is the difference between accepting a value and committing a value? > > > > On Wed, Feb 1, 2017 at 4:25 AM, Kant Kodali <k...@peernova.com> wrote: > >> Hi, >> >> Thanks for the response. I finished watching this video but I still got >> few questions. >> >> 1) The speaker seems to suggest that there are different consistency >> levels being used in different phases of paxos protocol. If so, what is >> right consistency level to set on these phases? >> >> 2) Right now, we just set consistency level as QUORUM at the global level >> and I dont think we ever change it so in this case what would be the >> consistency levels being used in different phases. >> >> 3) The fact that one should think about reading before the commit phase >> or after the commit phase (but not any other phase) sounds like there is >> something special about commit phase and what is that? when I set the >> QUORUM level consistency at global level Does the commit phase happen right >> after accept phase or no? or irrespective of the consistency level when >> does the commit phase happen anyway? and what happens during the commit >> phase? >> >> >> Thanks, >> kant >> >> >> On Wed, Feb 1, 2017 at 3:30 AM, Alain RODRIGUEZ <arodr...@gmail.com> >> wrote: >> >>> Hi, >>> >>> I believe that this talk from Christopher Batey at the Cassandra Summit >>> 2016 might answer most of your questions around LWT: >>> https://www.youtube.com/watch?v=wcxQM3ZN20c >>> >>> He explains a lot of stuff including consistency considerations. My >>> understanding is that the quorum read can only see the data written using >>> LWT after the commit phase. A SERIAL Read would see it (video, around >>> 23:40). >>> >>> Here are the slides as well: http://fr.slideshare.net >>> /DataStax/light-weight-transactions-under-stress-christopher >>> -batey-the-last-pickle-cassandra-summit-2016 >>> >>> Let us know if you still have questions after watching this (about 35 >>> minutes). >>> >>> C*heers, >>> ----------------------- >>> Alain Rodriguez - @arodream - al...@thelastpickle.com >>> France >>> >>> The Last Pickle - Apache Cassandra Consulting >>> http://www.thelastpickle.com >>> >>> 2017-02-01 10:57 GMT+01:00 Kant Kodali <k...@peernova.com>: >>> >>>> When you initiate a LWT(write) and do a QUORUM read is there a chance >>>> that one might not see the LWT write ? If so, can someone explain a bit >>>> more? >>>> >>>> Thanks! >>>> >>> >>> >> >
