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  1. Apache Cassandra
  2. CASSANDRA-14436

Add sampler for query time and expose with nodetool

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      Create a new nodetool profileload that functions just like toppartitions but with more data, returning the slowest local reads and writes on the host during a given duration and highest frequency touched partitions (same as nodetool toppartitions). Refactor included to extend use of the sampler for uses outside of top frequency (max instead of total sample values).

      Future work to this is to include top cpu and allocations by query and possibly tasks/cpu/allocations by stage during time window.

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            cnlwsu Chris Lohfink
            cnlwsu Chris Lohfink
            Chris Lohfink
            Aleksey Yeschenko, Dinesh Joshi
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