Cassandra 2.0: Next-generation big data easy migration from relational databases

2008, http://www.aliyun.com/zixun/aggregation/1560.html ">facebook gave a gift to large data users. Social giants open source Cassandra--nosql large data distributed databases. Today, with the advent of Cassandra 2.0, this gift is becoming more precious.


since 2008, under the direction of the Apache Software Foundation (ASF), Cassandra has become stronger and faster. Today, according to the Apache Foundation, "Cassandra can respond quickly and reliably to large datasets without compromising performance, whether running in the cloud or partially preset in a mixed-data repository." It is a fully distributed architecture that provides fault-tolerant features to ensure that applications are not interrupted and that their linear scalability can handle thousands of requests per second.

"In five years, Apache Cassandra has grown to be the world's most widely used NoSQL database, and as a support for many of today's most popular applications," said Jonathan Ellis, vice president of
Apache Cassandra, in a statement. ”


with high-end users like ebay, Reddit and Twitter, Cassandra can handle large data without sacrificing performance. Cassandra the largest user can not accept poor data performance.


's latest Cassandra 2.0 version includes a number of new features. The main upgrade, according to Ellis, is that "Cassandra 2.0 makes it easier for developers to migrate from relational databases and quickly improve productivity." ”


more specifically, new features and improvements include:


-Lightweight trading ensures a linear consistency of operations at the serialization isolation level provided by similar relational databases, preventing conflicts between parallel requests


-Triggers can drive performance-critical code closer to where it is processed, simplifying integration with event-driven frameworks such as Storm


-CQL (Cassandra Query Language) enhances index support by enabling features such as Cursors


-If the initial query takes up too much time, you can try again to avoid the query timeout by sending redundant requests to other replicas


-Customized Thrift server deployment, based on Lmax disruptor, a high-performance thread message library that enables lower message processing latency and increased throughput through flexible buffer allocation strategies

The new version of
Cassandra from Wednesday onwards, like all other Apache projects, Cassandra 2.0 is free and is licensed under Apache 2.0.