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(function() {
'use strict';
var s = new ShardingTest({shards: 2, other: {enableBalancer: true}});
var config = s.s0.getDB('config');
assert.commandWorked(s.s0.adminCommand({enableSharding: 'needToMove'}));
s.ensurePrimaryShard('needToMove', s.shard0.shardName);
// Returns an error when trying to remove a shard that doesn't exist.
assert.commandFailedWithCode(s.s0.adminCommand({removeshard: "shardz"}), ErrorCodes.ShardNotFound);
var topologyTime0 = config.shards.findOne({_id: s.shard0.shardName}).topologyTime;
var topologyTime1 = config.shards.findOne({_id: s.shard1.shardName}).topologyTime;
assert.gt(topologyTime1, topologyTime0);
// First remove puts in draining mode, the second tells me a db needs to move, the third
// actually removes
assert.commandWorked(s.s0.adminCommand({removeshard: s.shard0.shardName}));
// Can't make all shards in the cluster draining
assert.commandFailedWithCode(s.s0.adminCommand({removeshard: s.shard1.shardName}),
ErrorCodes.IllegalOperation);
var removeResult = assert.commandWorked(s.s0.adminCommand({removeshard: s.shard0.shardName}));
assert.eq(removeResult.dbsToMove, ['needToMove'], "didn't show db to move");
s.s0.getDB('needToMove').dropDatabase();
// Ensure the balancer moves the config.system.sessions collection chunks out of the shard being
// removed
s.awaitBalancerRound();
removeResult = assert.commandWorked(s.s0.adminCommand({removeshard: s.shard0.shardName}));
assert.eq('completed', removeResult.state, 'Shard was not removed: ' + tojson(removeResult));
var existingShards = config.shards.find({}).toArray();
assert.eq(
1, existingShards.length, "Removed server still appears in count: " + tojson(existingShards));
var topologyTime2 = existingShards[0].topologyTime;
assert.gt(topologyTime2, topologyTime1);
assert.commandFailed(s.s0.adminCommand({removeshard: s.shard1.shardName}));
// Should create a shard0002 shard
var rs = new ReplSetTest({nodes: 1});
rs.startSet({shardsvr: ""});
rs.initiate();
assert.commandWorked(s.s0.adminCommand({addshard: rs.getURL()}));
assert.eq(2, s.config.shards.count(), "new server does not appear in count");
rs.stopSet();
s.stop();
})();
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