CODEWITHSUNDEEP
cassandra
user2059239
user2059239

Reputation: 41

Adding a new node to existing cluster

Is it possible to add a new node to an existing cluster in cassandra 1.2 without running nodetool cleanup on each individual node once data has been added?

It probably isn't but I need to ask because I'm trying to create an application where each user's machine is a server allowing for endless scaling.

Any advice would be appreciated.

Upvotes: 1

Views: 1509

Answers (1)

Rich Sutton
Rich Sutton

Reputation: 10794

Yes, it is possible. But you should be aware of the side-effects of not doing so.

nodetool cleanup purges keys that are no longer allocated to that node. According to the Apache docs, these keys count against the allocated data for that node, which can cause the auto bootstrap process for the next node to not properly balance the ring. So depending on how you are bringing new user machines into the ring, this may or may not be a problem.

Also keep in mind that nodetool cleanup only needs to be run on nodes that lost keyspace to the new node - i.e. adjacent nodes, not all nodes, in the cluster.

Upvotes: 2

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