HBase coprocessor !

If you need to execute some custom code in your HBase cluster, you can use HBase coprocessor :

• Observers : like triggers in RDBMS
• RegionObserver : To pick up every DML statement : get, scan, put, delete, flush, split
• WALObserver : To intercept WAL writing and reconstruction events
• MasterObserver : To detect every DDL operation
• EndPoints : kind of stored procedure