cassandra compaction strategy，
1. STCS write-intensive
2. LCS read-intensive
3. TWCS (DTCS) used for time series data (set TTL data)
from: http://docs.datastax.com/en/cassandra/3.0/cassandra/dml/dmlHowDataMaintain.html#dmlHowDataMaintain__dml-compaction
4. how to use TWCS ?
https://issues.apache.org/jira/browse/CASSANDRA-9666
https://github.com/jeffjirsa/twcs
http://thelastpickle.com/blog/2016/12/08/TWCS-part1.html ----
http://thelastpickle.com/blog/2017/01/10/twcs-part2.html
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