Apache Cassandra是一套开
源分布式数据库管理系统。它最初 由Facebook开发,用于储存特别大的数据。Facebook目前在使用此系统。
主要特性:
Cassandra的主要特点就是它不是一个数据库,而是由一堆数据库节点共同构成的一个分布式网络服务,对Cassandra
的一个写操作,会被复制到其他节点上去,对Cassandra的读操作,也会被路由到某个节点上面去读取。对于一个Cassandra群集来说,扩展性能
是比较简单的事情,只管在群集里面添加节点就可以了。
该版本与 0.6.0 Beta3 相比较,改进如下:
* JMX drain to flush memtables and run through commit log
(CASSANDRA-880)
* Bootstrapping can skip ranges under the right
conditions (CASSANDRA-902)
* fix merging row versions in range_slice
for CL > ONE (CASSANDRA-884)
* default write ConsistencyLeven
chaned from ZERO to ONE
* fix for index entries spanning mmap buffer
boundaries (CASSANDRA-857)
* use lexical comparison if time part of
TimeUUIDs are the same (CASSANDRA-907)
* bound read, mutation, and
response stages to fix possible OOM during log replay (CASSANDRA-885)
*
Use microseconds-since-epoch (UTC) in cli, instead of milliseconds
*
Treat batch_mutate Deletion with null supercolumn as "apply this
predicate to top level supercolumns" (CASSANDRA-834)
* Streaming
destination nodes do not update their JMX status (CASSANDRA-916)
*
Fix internal RPC timeout calculation (CASSANDRA-911)
* Added Pig
loadfunc to contrib/pig (CASSANDRA-910)
下载地址:
apache-cassandra-0.6.0-rc1-bin.tar.gz
apache-cassandra-0.6.0-rc1-src.tar.gz