// Tests that dropping and re-adding a shard with the same name to a cluster doesn't mess up // migrations (function() { 'use strict'; var st = new ShardingTest({shards: 2, mongos: 1}); var mongos = st.s; var admin = mongos.getDB('admin'); var coll = mongos.getCollection('foo.bar'); // Shard collection assert.commandWorked(mongos.adminCommand({enableSharding: coll.getDB() + ''})); // Just to be sure what primary we start from st.ensurePrimaryShard(coll.getDB().getName(), st.shard0.shardName); assert.commandWorked(mongos.adminCommand({shardCollection: coll + '', key: {_id: 1}})); // Insert one document assert.commandWorked(coll.insert({hello: 'world'})); // Migrate the collection to and from shard1 so shard0 loads the shard1 host assert.commandWorked(mongos.adminCommand( {moveChunk: coll + '', find: {_id: 0}, to: st.shard1.shardName, _waitForDelete: true})); assert.commandWorked(mongos.adminCommand( {moveChunk: coll + '', find: {_id: 0}, to: st.shard0.shardName, _waitForDelete: true})); // Drop and re-add shard with the same name but a new host. assert.commandWorked(mongos.adminCommand({removeShard: st.shard1.shardName})); assert.commandWorked(mongos.adminCommand({removeShard: st.shard1.shardName})); let shard2 = new ReplSetTest({nodes: 2, nodeOptions: {shardsvr: ""}}); shard2.startSet(); shard2.initiate(); assert.commandWorked(mongos.adminCommand({addShard: shard2.getURL(), name: st.shard1.shardName})); jsTest.log('Shard was dropped and re-added with same name...'); st.printShardingStatus(); // Try a migration assert.commandWorked( mongos.adminCommand({moveChunk: coll + '', find: {_id: 0}, to: st.shard1.shardName})); let shard2Conn = shard2.getPrimary(); assert.eq('world', shard2Conn.getCollection(coll + '').findOne().hello); st.stop(); shard2.stopSet(); })();