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)
