停止排空 mongodb 中的碎片 [英] Stop draining shard in mongodb

问题描述

--- Sharding Status --- 
  sharding version: { "_id" : 1, "version" : 3 }
  shards:
    {  "_id" : "set1",  "host" : "set1/m1.example.com:27018,mr1.example.com:27018,mrb1.example.com:27018" }
    {  "_id" : "set2",  "draining" : true,  "host" : "set2/m2.example.com:27018,mr2.example.com:27018,mrb2.example.com:27018" }
    {  "_id" : "set3",  "host" : "set3/m3.example.com:27018,mr3.example.com:27018,mrb3.example.com:27018" }

我错误地从分片集群中删除了 set2，它开始排空，我该如何停止排空?

by mistake I remove set2 from the shard cluster, and it starts draining, how do i stop the draining ?

推荐答案

RemoveShard 将启动排空过程，但没有 StopRemoveShard 命令.没关系，目前还没有命令，因为手动停止进程很容易.

RemoveShard will start the draining process but there is no StopRemoveShard command. It is alright there isn't a command yet since it is easy to stop the process manually.

Draining 只是平衡器开始将块从标记的分片(正在排空)中移出的状态.您可以通过删除分片元数据配置上的特殊排水"字段来停止排水.

Draining is just a state where the balancer starts to move chunks off the marked shard (which is draining). You can stop draining by removing the special "draining" field on the shard metadata configuration.

//connect to a mongos server with the mongo javascript shell
use config
//unset draining from all shards
db.shards.update({},{$unset:{draining:true}}, false, true)

完成此操作后，平衡器将恢复正常平衡，不再消耗分片.

After this is done the balancer will go back to normal balancing, and no longer drain the shard.

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