My current cluster contain 6 SearchGraph nodes and replication factor is 2.
Datacenter: SearchGraph
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UN 192.168.8.1 469 MiB 1 ? 936a1ac0-6d5e-4a94-8953-d5b5a2016b92 rack1
UN 192.168.8.2 427.71 MiB 1 ? 3f41dc2a-2672-47a1-90b5-a7c2bf17fb50 rack1
UN 192.168.8.3 431.27 MiB 1 ? 29f8fe44-3431-465e-b682-5d24e37d41d7 rack2
UN 192.168.8.4 480.73 MiB 1 ? 1f7de531-ff51-4581-bdb8-d9a686f1099e rack2
UN 192.168.8.5 498.9 MiB 1 ? 27d37833-56c8-44bd-bac0-7511b8bd74e8 rack2
UN 192.168.8.6 882.4 MiB 1 ? 0822145f-4225-4ad3-b2be-c995cc230830 rack1
I am planning to remove exiting 3 instance from cluster. I need only 3 instance in my cluster. Can any one specify the steps to be followed with out losing data.
Official documentation describes this in good details. Basically, all you need is to run nodetool decommission on corresponding node. But you need to do it one by one, not all together.