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:

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1. rs1:PRIMARY>rs.remove("localhost:28014")
2. {"ok":1}
3. rs1:PRIMARY>rs.remove("localhost:28013")
4. {"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()
1. {
2. "set":"rs1",
3. "date":ISODate("2012-05-31T14:08:29Z"),
4. "myState":1,248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "members":[
5. {
6. "_id":0,108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "name":"localhost:28010",248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "health":1,108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "state":1,248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "stateStr":"PRIMARY",108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "optime":{
7. "t":1338473273000,108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "i":1
8. },108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "optimeDate":ISODate("2012-05-31T14:07:53Z"),248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "self":true
9. },108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "_id":1,248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "name":"localhost:28011",108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "health":1,248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "state":2,108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "stateStr":"SECONDARY",248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "uptime":34,248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "lastHeartbeat":ISODate("2012-05-31T14:08:29Z")
10. "_id":2,248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "name":"localhost:28012",108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> }
11. ],108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "ok":1
12. }
13. rs1:PRIMARY>