websocket server/client/android
https://github.com/elabs/mobile-websocket-example/blob/master/android/WebsocketExampleClientProject/WebsocketExampleClient/src/main/java/se/elabs/websocketexampleclient/MainActivity.java
http://www.elabs.se/blog/66-using-websockets-in-native-ios-and-android-apps
https://developer.kaazing.com/documentation/5.0/dev-android/p_dev_android_client.html
http://www.kevinhoyt.com/2015/09/16/websocket-on-android/
https://kheresy.wordpress.com/2013/04/02/html5-websocket-client/
https://kheresy.wordpress.com/2014/03/06/websocketpp-client/
cassandra disable bloomfilter
http://grokbase.com/t/cassandra/user/119g2qczmt/how-to-reduce-disk-read-and-bloom-filter-performance
https://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_tuning_bloom_filters_c.html
https://grockdoc.com/cassandra/2.1/articles/tuning-reads-via-the-bloom-filter_88c8f57a-71d0-41ee-b77f-617c64ad4739