snowflake:http://boundary.com/blog/2012/01/12/flake-a-decentralized-k-ordered-unique-id-generator-in-erlang/
http://www.appfirst.com/blog/best-practices-for-managing-hbase-in-a-high-write-environment/
HBase/Solr
http://blog.csdn.net/yangbutao/article/details/8351317?reload