MongoDB 3.1.9 发布分布式文档数据库

MongoDB 3.1.9 发布，此版本是个开发版本，不建议在生产环境使用。

新特性：

– Improved high-availability: config servers as replica sets and faster elections
– WiredTiger as the default storage engine
– Document validation rules
– Partial indexes
– Encryption at rest
– SpiderMonkey as the Javascript engine
– Multilingual case-sensitive full-text search and improved Unicode text search support
– Aggregation and query optimizer improvements, including a sampling operator and outer left joins
– Network stack improvements
– Tools improvements

bug 修复：

– SERVER-533: Aggregation stage to randomly sample documents
– SERVER-1448: Host sharding config data on a replica set
– SERVER-10225: Replica set failover speed improvement
– SERVER-15176: New commands for find and getMore
– SERVER-17861: Change the default storage engine to WiredTiger
– SERVER-17991: Encrypted Storage Engine Enterprise – Single system key
– SERVER-18624: listCollections command should not be O(n^2) on MMAPv1
– SERVER-20159: Out of memory on index build during initial sync even with low cacheSize parameter
– SERVER-20339: Make NetworkInterfaceASIO the default factory
– TOOLS-916: Mongo export throws reflect.Value.Type errors