dyf6372 commented on issue #6719: use SnapTreeMap instead of ConcurrentSkipListMap URL: https://github.com/apache/incubator-druid/pull/6719#issuecomment-445897837 @leventov just like https://github.com/nbronson/snaptree/issues/6 said, v0.2 is not deployed at maven central repo. @b-slim Cassandra use SnapTreeMap before version 2.1 (https://github.com/apache/cassandra/blob/cassandra-2.0/build.xml). In version 2.1, it used a custom in-memory BTree to replace SnapTreeMap(https://www.datastax.com/dev/blog/cassandra-2-1-now-over-50-faster).
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