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1) What are the things that one should practice to maintain Cassandra cluster properly?

2) As explained here:Apache Cassandra at Clearspring, they are doing rolling restart in a week or two.

3) How does rolling restart help in maintaining Cluster? Is there any specific activities (Cleaning) that Cassandra does while restarting?

samarth
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The only real generic rule is that you must run nodetool repair at least every gc_grace_seconds to avoid deleted data reappearing. Otherwise, general monitoring of your cluster using cfstats, iostat, etc., is always a good idea.

rs_atl
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