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// 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 config = mongos.getDB('config');
var coll = mongos.getCollection('foo.bar');
// Get all the shard info and connections
var shards = [];
config.shards.find().sort({_id: 1}).forEach(function(doc) {
shards.push(Object.merge(doc, {conn: new Mongo(doc.host)}));
});
// Shard collection
assert.commandWorked(mongos.adminCommand({enableSharding: coll.getDB() + ''}));
// Just to be sure what primary we start from
st.ensurePrimaryShard(coll.getDB().getName(), shards[0]._id);
assert.commandWorked(mongos.adminCommand({shardCollection: coll + '', key: {_id: 1}}));
// Insert one document
assert.writeOK(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: shards[1]._id, _waitForDelete: true}));
assert.commandWorked(mongos.adminCommand(
{moveChunk: coll + '', find: {_id: 0}, to: shards[0]._id, _waitForDelete: true}));
// Drop and re-add shard with the same name but a new host.
assert.commandWorked(mongos.adminCommand({removeShard: shards[1]._id}));
assert.commandWorked(mongos.adminCommand({removeShard: shards[1]._id}));
var shard2 = MongoRunner.runMongod({});
assert.commandWorked(mongos.adminCommand({addShard: shard2.host, name: shards[1]._id}));
jsTest.log('Shard was dropped and re-added with same name...');
st.printShardingStatus();
shards[0].conn.getDB('admin').runCommand({setParameter: 1, traceExceptions: true});
shard2.getDB('admin').runCommand({setParameter: 1, traceExceptions: true});
// Try a migration
assert.commandWorked(
mongos.adminCommand({moveChunk: coll + '', find: {_id: 0}, to: shards[1]._id}));
assert.eq('world', shard2.getCollection(coll + '').findOne().hello);
st.stop();
})();
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