Nosql Mongodb之旅(26)—MongoDB Replica Sets减少节点

    当应用的压力小时，可以减少一些节点来减少硬件资源的成本；总之这是一个长期且持续的工作。

    下面将刚刚添加的两个新节点28013 和28014 从复制集中去除掉，只需执行rs.remove 指令就可以了，具体如下:

 rs1:PRIMARY> rs.remove("localhost:28014")
 { "ok" : 1 }
 rs1:PRIMARY> rs.remove("localhost:28013")
 { "ok" : 1 }

    查看复制集状态，可以看到现在只有28010、28011、28012 这三个成员，原来的28013 和28014 都成功去除了

 rs1:PRIMARY> rs.status()
 {
 "set" : "rs1",
 "date" : ISODate("2012-05-31T14:08:29Z"),
 "myState" : 1,
 "members" : [
 {
 "_id" : 0,
 "name" : "localhost:28010",
 "health" : 1,
 "state" : 1,
 "stateStr" : "PRIMARY",
 "optime" : {
 "t" : 1338473273000,
 "i" : 1
 },
 "optimeDate" : ISODate("2012-05-31T14:07:53Z"),
 "self" : true
 },
 {
 "_id" : 1,
 "name" : "localhost:28011",
 "health" : 1,
 "state" : 2,
 "stateStr" : "SECONDARY",
 "uptime" : 34,
 "optime" : {
 "t" : 1338473273000,
 "i" : 1
 },
 "optimeDate" : ISODate("2012-05-31T14:07:53Z"),
 "lastHeartbeat" : ISODate("2012-05-31T14:08:29Z")
 },
 {
 "_id" : 2,
 "name" : "localhost:28012",
 "health" : 1,
 "state" : 2,
 "stateStr" : "SECONDARY",
 "uptime" : 34,
 "optime" : {
 "t" : 1338473273000,
 "i" : 1
 },
 "optimeDate" : ISODate("2012-05-31T14:07:53Z"),
 "lastHeartbeat" : ISODate("2012-05-31T14:08:29Z")
 }
 ],
 "ok" : 1
 }
 rs1:PRIMARY>