Hello Alain, Thank you very much for reviewing it. You answer on seed nodes cleared my doubts. I will update it as per your suggestion.
I have few followup questions on decommissioning of datacenter: - Do i need to run nodetool repair -full on each of the nodes (old + new dc nodes) before starting the decommissioning process of old dc. - We have around 15 apps using cassandra cluster. I want to make sure that all queries before starting the new datacenter are going with right consistency level i.e LOCAL_QUORUM instead of QUORUM. Is there a way i can log the consistency level of each query somehow in some log file. Regards, Pradeep On Mon, Sep 17, 2018 at 9:26 PM, Alain RODRIGUEZ <arodr...@gmail.com> wrote: > Hello Pradeep, > > It looks good to me and it's a cool runbook for you to follow and for > others to reuse. > > To make sure that cassandra nodes in one datacenter can see the nodes of >> the other datacenter, add the seed node of the new datacenter in any of the >> old datacenter’s nodes and restart that node. > > > Nodes seeing each other from the distinct rack is not related to seeds. > It's indeed recommended to use seeds from all the datacenter (a couple or > 3). I guess it's to increase availability on seeds node and/or maybe to > make sure local seeds are available. > > You can perfectly (and even have to) add your second datacenter nodes > using seeds from the first data center. A bootstrapping node should never > be in the list of seeds unless it's the first node of the cluster. Add > nodes, then make them seeds. > > > Le lun. 17 sept. 2018 à 11:25, Pradeep Chhetri <prad...@stashaway.com> a > écrit : > >> Hello everyone, >> >> Can someone please help me in validating the steps i am following to >> migrate cassandra snitch. >> >> Regards, >> Pradeep >> >> On Wed, Sep 12, 2018 at 1:38 PM, Pradeep Chhetri <prad...@stashaway.com> >> wrote: >> >>> Hello >>> >>> I am running cassandra 3.11.3 5-node cluster on AWS with SimpleSnitch. I >>> was testing the process to migrate to GPFS using AWS region as the >>> datacenter name and AWS zone as the rack name in my preprod environment and >>> was able to achieve it. >>> >>> But before decommissioning the older datacenter, I want to verify that >>> the data in newer dc is in consistence with the one in older dc. Is there >>> any easy way to do that. >>> >>> Do you suggest running a full repair before decommissioning the nodes of >>> older datacenter ? >>> >>> I am using the steps documented here: https://medium.com/p/465e9bf28d99 >>> I will be very happy if someone can confirm me that i am doing the right >>> steps. >>> >>> Regards, >>> Pradeep >>> >>> >>> >>> >>> >>
