A Sharded Cluster with 2 replset shards (shard A and shard B), 2 mongos (a and b).
1、in mongos a
mongos> sh.enableSharding("test")
{ "ok" : 1 }
mongos> sh.shardCollection("test.table1",{_id:"hashed"})
{ "collectionsharded" : "test.table1", "ok" : 1 }
2、in mongos b
mongos> db.adminCommand({getShardVersion:"test.table1"})
{
"version" : Timestamp(2, 5),
"versionEpoch" : ObjectId("5d4a40b60a833e0eef3082f5"),
"ok" : 1
}
3、in mongos a
sh.shardCollection("test.table2",{_id:"hashed"})
4、in mongos b
mongos> db.adminCommand({getShardVersion:"test.table2"})
{
"code" : 118,
"ok" : 0,
"errmsg" : "Collection test.table2 is not sharded."
}
5、stepdown the primary shard of 'test' databse，and check the new priamry shardingState.
pmongo186:PRIMARY> db.adminCommand({shardingState:1})
{
"enabled" : true,
"configServer" : "cfg/xxxxxxxx",
"shardName" : "pmongo186",
"clusterId" : ObjectId("5c5166d655a6f24da8dd7418"),
"versions" :
{
"test.system.indexes" : Timestamp(0, 0),
"test.table1" : Timestamp(0, 0),
"test.table2" : Timestamp(0, 0),
"local.replset.minvalid" : Timestamp(0, 0),
"local.replset.election" : Timestamp(0, 0),
"local.me" : Timestamp(0, 0),
"local.startup_log" : Timestamp(0, 0),
"admin.system.version" : Timestamp(0, 0),
"local.oplog.rs" : Timestamp(0, 0),
"admin.system.roles" : Timestamp(0, 0),
"admin.system.users" : Timestamp(0, 0),
"local.system.replset" : Timestamp(0, 0),
}
,
"ok" : 1
}
pmongo186:PRIMARY>
pmongo186:PRIMARY> db.adminCommand({getShardVersion:"test.table2"})
{
"configServer" : "cfg/xxxxxxxx",
"inShardedMode" : false,
"mine" : Timestamp(0, 0),
"global" : Timestamp(0, 0),
"ok" : 1
}
and from now on , all insert of test.table2 with mongos b will go to the primary shard. we flushRouterConfig of mongos b , we can’t get all data just inserted 。
6、 in mongos b
mongos> db.table2.insert({_id:1})
WriteResult({ "nInserted" : 1 })
mongos> db.table2.insert({_id:2})
WriteResult({ "nInserted" : 1 })
mongos> db.table2.insert({_id:3})
WriteResult({ "nInserted" : 1 })
mongos> db.table2.insert({_id:4})
WriteResult({ "nInserted" : 1 })
mongos> db.table2.insert({_id:5})
WriteResult({ "nInserted" : 1 })
mongos> db.table2.insert({_id:6})
WriteResult({ "nInserted" : 1 })
mongos> db.table2.insert({_id:7})
WriteResult({ "nInserted" : 1 })
mongos> db.table2.insert({_id:8})
WriteResult({ "nInserted" : 1 })
mongos>
mongos> db.adminCommand({flushRouterConfig:1})
{ "flushed" : true, "ok" : 1 }
mongos> db.table2.find()
{ "_id" : 3 }
{ "_id" : 6 }
{ "_id" : 8 }
7、in mongos a, we can't get data just insert
mongos> use test
switched to db test
mongos> db.table2.find()
{ "_id" : 3 }
{ "_id" : 6 }
{ "_id" : 8 }
Bug
Major - P3