http://stackoverflow.com/questions/40067933/hbase-whats-the-difference-between-wal-and-memstore

http://www.slideshare.net/caroljmcdonald/h-base-nosqlcarol

http://hadoop-hbase.blogspot.com.by/2012/05/hbase-hdfs-and-durable-sync.html

http://blog.cloudera.com/blog/2012/06/hbase-io-hfile-input-output/

http://blog.cloudera.com/blog/2012/06/hbase-write-path/

http://www.larsgeorge.com/2009/10/hbase-architecture-101-storage.html

http://stackoverflow.com/questions/32755662/hbase-wal-file-and-hdfs-data-staging?rq=1

https://www.quora.com/Why-does-HBase-keep-WAL-on-HDFS-instead-of-local-disks

hbase-architecture