secondary don't refresh its routing table when transition to primary.

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 }