Thank you Alex and Jeff for your response. On Sunday, September 20, 2020, Jeff Jirsa <jji...@gmail.com> wrote:
> Data is always sent to all replicas but is only guaranteed by consistency > level, and ordering into guaranteed if you’re using appropriate serial > consistency levels > > e.g. if you insert into dc1 with LOCAL consistency levels and read from > dc2, dc2’s state is strictly undefined and there is no order implied or > guaranteed > > On Sep 20, 2020, at 9:57 AM, Alex Ott <alex...@gmail.com> wrote: > > > data is always written to all replicas in the cluster. > here is good diagram how this happens in the multi-dc cluster: > https://docs.datastax.com/en/dse/6.7/dse-arch/datastax_ > enterprise/dbInternals/dbIntClientRequestsMultiDCWrites.html > > regarding the second question - theoretically, yes, it's possible, but if > they were done for the same primary key, then they will be resolved via > data timestamp. > > On Sun, Sep 20, 2020 at 5:31 PM Jai Bheemsen Rao Dhanwada < > jaibheem...@gmail.com> wrote: > >> Hello, >> >> I have a question regarding multi Datacenter replication. >> In a multi datacenter(dc-1, dc-2) if two records are written into dc-1 is >> there a guarantee that these two records replicate to dc-2 in the same >> order or is there a possibility that second insert replicate faster than >> first insert? (Assuming first record is bigger than seconds record in terms >> of packet size). >> > > > -- > With best wishes, Alex Ott > http://alexott.net/ > Twitter: alexott_en (English), alexott (Russian) > >
