Cassandra Tutorials (2)----The new features of Cassandra2.2

Cassandra offers a number of new features: Performance, operability, CQL3 improvements and other significant changes.

1. New features

   CQL3 Support JSON	Cassandra supports inserting and querying JSON data
   user-defined function (UDFs)	cassandra can use the UDFs function to store data
   in udas function
   Role-based access (RBAC)	RBAC can define new role access control
   Native Protocol V4	CQL Native Protocol Enhancement
   Support window	Support window7 , window8 ...

2. Improved performance

   
   

   All row caches outside the heap	Row The cache is moved out of the heap to improve memory usage
   read Data using Bytebuffer Unzip	Memory-mapped data and decompression operations outside the heap for higher performance
   Compression Commit Log	Commitlog compression saved on the hard drive

   
   

3. CQL3 Promotion

   
   

   
   

   The in operation is supported on any partition key column or clustering column	Improve Select query criteria
   Accept strings referenced by dollar	Implementing dollar string constant syntax
   Allow mixed use of token and partition key	Allow query statements to contain token and partition key
   Support for using index on the map collection	Promote the use of index in nested collections
   Clear command in CQL	Add clear command to clear screen in CQL
   Run with Count (*) and COUNT (1) as common aggregates	Allow count () operations in aggregations

   
   

   
   

4. Other significant changes

   
   

   remove cql2	cql2 expiration is removed, using cql3 with cassandra interactive
   remove cassandra-cli	CASSANDRA-CLI tool expires, using cql3 with cassandra interactive
   Shorten the file name of sstable on disk	Shorten sstable file name blocking Windows breakage
   Default Increase Repair	Recommended Improvement Repair , the default option
   Change in Permissions	Separate superuser for administrative users, add permissions to functional permissions

This article is from the Java Architect's Road blog, so be sure to keep this source http://eric100.blog.51cto.com/2535573/1712582

Cassandra Tutorials (2)----The new features of Cassandra2.2