Cassandra Snitch Change vs Topology Change












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I have a Cassandra DC setup with GossipPropertyFileSnitch in AWS east region over 3 AZs and the rack and dc's being specified in the property file as



AZ-1         AZ-2         AZ-3
------- -------- --------
DC=DC1 DC=DC1 DC=DC1
rack=2b rack=2c rack=2a


When I change this to Ec2Snitch the automatic DC/Rack info changes into:



AZ-1         AZ-2         AZ-3
------- -------- --------
DC=DC1 DC=DC1 DC=DC1
rack=2a rack=2b rack=2c


Considering the DC has data, the above scenario does not seem to be qualifying for splitting of DC, or addition/removal of nodes; In such case, shall we call it a topology change, since the rack information got changed among themselves?










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    I have a Cassandra DC setup with GossipPropertyFileSnitch in AWS east region over 3 AZs and the rack and dc's being specified in the property file as



    AZ-1         AZ-2         AZ-3
    ------- -------- --------
    DC=DC1 DC=DC1 DC=DC1
    rack=2b rack=2c rack=2a


    When I change this to Ec2Snitch the automatic DC/Rack info changes into:



    AZ-1         AZ-2         AZ-3
    ------- -------- --------
    DC=DC1 DC=DC1 DC=DC1
    rack=2a rack=2b rack=2c


    Considering the DC has data, the above scenario does not seem to be qualifying for splitting of DC, or addition/removal of nodes; In such case, shall we call it a topology change, since the rack information got changed among themselves?










    share|improve this question

























      0












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      0







      I have a Cassandra DC setup with GossipPropertyFileSnitch in AWS east region over 3 AZs and the rack and dc's being specified in the property file as



      AZ-1         AZ-2         AZ-3
      ------- -------- --------
      DC=DC1 DC=DC1 DC=DC1
      rack=2b rack=2c rack=2a


      When I change this to Ec2Snitch the automatic DC/Rack info changes into:



      AZ-1         AZ-2         AZ-3
      ------- -------- --------
      DC=DC1 DC=DC1 DC=DC1
      rack=2a rack=2b rack=2c


      Considering the DC has data, the above scenario does not seem to be qualifying for splitting of DC, or addition/removal of nodes; In such case, shall we call it a topology change, since the rack information got changed among themselves?










      share|improve this question













      I have a Cassandra DC setup with GossipPropertyFileSnitch in AWS east region over 3 AZs and the rack and dc's being specified in the property file as



      AZ-1         AZ-2         AZ-3
      ------- -------- --------
      DC=DC1 DC=DC1 DC=DC1
      rack=2b rack=2c rack=2a


      When I change this to Ec2Snitch the automatic DC/Rack info changes into:



      AZ-1         AZ-2         AZ-3
      ------- -------- --------
      DC=DC1 DC=DC1 DC=DC1
      rack=2a rack=2b rack=2c


      Considering the DC has data, the above scenario does not seem to be qualifying for splitting of DC, or addition/removal of nodes; In such case, shall we call it a topology change, since the rack information got changed among themselves?







      cassandra replication cassandra-3.0






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      asked Nov 12 '18 at 19:14









      DivsDivs

      6311823




      6311823
























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