Reads at quorum in dc3 will involve dc1 and dc2 as they will require a response from more than half the replicas throughout the Cluster.
If you're using RF=3 in each DC, each read will need at least 5 responses, which DC3 cannot provide on its own. You can have troubles if DC3 has more than half then replicas, but I guess/hope it is not the case, otherwise you're fine. You would be in trouble though if you were using local_quorum on DC3 or ONE on any DC. Le sam. 27 août 2016 19:11, Surbhi Gupta <surbhi.gupt...@gmail.com> a écrit : > Yes, it will have issue during the time new nodes are building.... > So it is always advised to use LOCAL_QUORUM instead of QUORUM and > LOCAL_ONE instead of ONE > > On 27 August 2016 at 09:45, laxmikanth sadula <laxmikanth...@gmail.com> > wrote: > >> Hi, >> >> I'm going to add a new data center DC3 to an existing cassandra cluster >> which has already 2 data centers DC1 , DC2. >> >> The thing I'm worried of is about tables in one keyspace which has QUORUM >> reads and NOT LOCAL_QUORUM. >> So while adding a new data centers with auto_bootstrap:false and >> 'nodetool rebuild' , will the queries to tables in this keyspace will have >> any issue ? >> >> Thanks in advance. >> >> -- >> Regards, >> Laxmikanth >> > >
