Tomasz Grabiec 7747f2dde3 Merge "nodetool toppartitions" from Rafi & Avi ...

Implementation of nodetool toppartiotion query, which samples most frequest PKs in read/write
operation over a period of time.

Content:
- data_listener classes: mechanism that interfaces with mutation readers in database and table classes,
- toppartition_query and toppartition_data_listener classes to implement toppartition-specific query (this
  interfaces with data_listeners and the REST api),
- REST api for toppartitions query.

Uses Top-k structure for handling stream summary statistics (based on implementation in C*, see #2811).

What's still missing:
- JMX interface to nodetool (interface customization may be required),
- Querying #rows and #bytes (currently, only #partitions is supported).

Fixes #2811

* https://github.com/avikivity/scylla rafie_toppartitions_v7.1:
  top_k: whitespace and minor fixes
  top_k: map template arguments
  top_k: std::list -> chunked_vector
  top_k: support for appending top_k results
  nodetool toppartitions: refactor table::config constructor
  nodetool toppartitions: data listeners
  nodetool toppartitions: add data_listeners to database/table
  nodetool toppartitions: fully_qualified_cf_name
  nodetool toppartitions: Toppartitions query implementation
  nodetool toppartitions: Toppartitions query REST API
  nodetool toppartitions: nodetool-toppartitions script

2018-12-28 16:31:24 +01:00

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