分布式 - 通过JAVA代码是否能够判断MongoDB集群的某个表设置了分片？

Question

通过JAVA代码是否能够判断MongoDB集群的某个表设置了分片？

Answer 1

You can retrieve the config collections. The collections in each document in the collections are sharded; you can also learn the specific situation of the sharding of the collection. 说着有点拗口

The following example is one of the collections given in the official documentation:

{
   "_id" : "records.pets",                             --Database name.Collection name
   "lastmod" : ISODate("1970-01-16T15:00:58.107Z"),
   "dropped" : false,
   "key" : {
         "a" : 1                                       --Shard key
   },
   "unique" : false,
   "lastmodEpoch" : ObjectId("5078407bd58b175c5c225fdc")
}

Use Java code to retrieve the above collection to get the required sharding information.

For reference.

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