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nodetool help
nodetool status             = Print cluster information (state, load, IDs, ...)
nodetool info               = Print node information (uptime, load, ...)
nodetool describecluster    = Print the name, snitch, partitioner and schema version of a cluster
nodetool version            = Print cassandra version
nodetool ring               = Print information about the token ring
nodetool tablestats | more  = Print statistics on tables