分布式事务内存数据库:MemDB

jopen 9年前

MemDB 是全球首个支持分布式事务的 MongoDB。

高性能和可伸缩

  • 快速的内存数据访问,高达 25,000 ops (single doc read/write) /碎片 (each shard take one CPU core).

  • 系统可水平伸缩

  • 没有单点瓶颈

真正的分布式 ACID 事务

  • 在分布式环境真正支持 ACID (Stands for Atomicity, Consistency, Isolation, Durability) 事务

  • MemDB 让 MongoDB 支持 ACID 事务

兼容 MongoDB 和 Mongoose

  • 直接使用 MongoDB 的查询 API

  • 内置 Mongoose 支持

高可用性

  • 每个碎片都有一个或者多个 slaves,不会发生单点故障

MemDB shell:

分布式事务内存数据库:MemDB

架构:

Mdbgoose:

var memdb = require('memdb-client');  var P = memdb.Promise;  var mdbgoose = memdb.goose;  // Define player schema  var playerSchema = new mdbgoose.Schema({      _id : String,      name : String,      areaId : Number,      deviceType : Number,      deviceId : String,      items : [mdbgoose.SchemaTypes.Mixed],  }, {collection : 'player'});  // Define player model  var Player = mdbgoose.model('player', playerSchema);  var main = P.coroutine(function*(){      // Connect to memdb      yield mdbgoose.connectAsync({          shards : { // specify all shards here              s1 : {host : '127.0.0.1', port: 31017},              s2 : {host : '127.0.0.1', port: 31018},          }      });      // Make a transaction in s1      yield mdbgoose.transactionAsync(P.coroutine(function*(){          var player = new Player({              _id : 'p1',              name: 'rain',              areaId : 1,              deviceType : 1,              deviceId : 'id1',              items : [],          });          // insert a player          yield player.saveAsync();          // find player by id          var doc = yield Player.findByIdAsync('p1');          console.log('%j', doc);          // find player by areaId, return array of players          var docs = yield Player.findAsync({areaId : 1});          console.log('%j', docs);          // find player by deviceType and deviceId          player = yield Player.findOneAsync({deviceType : 1, deviceId : 'id1'});          // update player          player.areaId = 2;          yield player.saveAsync();          // remove the player          yield player.removeAsync();      }), 's1');  });  if (require.main === module) {      main().finally(process.exit);  }

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