Failed to delete Mongo Shard collection

After you stop balancer, back up the entire Shard library, and then enable balancer to delete the Shard set merge rebuild. Encountered the following error:

Mongos> Db.businessInfo.drop ();
2016-08-14t09:06:58.324+0800 E QUERY Error:drop failed: {
"Code": 13331,
"OK": 0,
"ErrMsg": "Exception:collection ' s metadata is undergoing changes. Please try again. "
}
At Error (<anonymous>)
At Dbcollection.drop (src/mongo/shell/collection.js:620:15)
at (Shell): 1:12 at src/mongo/shell/collection.js:620

After a bit of logic, you should drop sharding collection before enabling balancer.

This article is from the "strive to the front" blog, please be sure to keep this source http://liucb.blog.51cto.com/3230681/1837811

Failed to delete Mongo Shard collection