有些时候有于硬件资源有限，所以我们不得不进行一些回收工作，下面我们就要将刚刚启用的Shard Server 回收，系统首先会将在这个即将被移除的Shard Server 上的数据先平均分配到其它的Shard Server 上，然后最终在将这个Shard Server 踢下线,我们需要不停的调用db.runCommand({"removeshard" :"localhost:20002"});来观察这个移除操作进行到哪里了：

1. >useadmin
2. switchedtodbadmin
3. >db.runCommand({"removeshard":"localhost:20002"});
4. {
5. "msg":"drainingstartedsuccessfully",
6. "state":"started",
7. "shard":"shard0002",248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "ok":1
8. }
9. >db.runCommand({"removeshard":"localhost:20002"});
10. {
11. "msg":"drainingongoing",108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "state":"ongoing",248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "remaining":{
12. "chunks":NumberLong(44),248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "dbs":NumberLong(0)
13. },248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> ……
14. "msg":"drainingongoing",248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "state":"ongoing",108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "remaining":{
15. "chunks":NumberLong(1),108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "dbs":NumberLong(0)
16. },108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "ok":1
17. }
18. "msg":"removeshardcompletedsuccessfully",248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "state":"completed",248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "assertion":"can'tfindshardfor:localhost:20002",108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "assertionCode":13129,248); line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "errmsg":"dbassertionfailure",108); list-style:decimal-leading-zero outside; color:inherit; line-height:21px; margin:0px!important; padding:0px 3px 0px 10px!important"> "ok":0
19. }