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// Validates the remove/drain shard functionality when there is data on the shard being removed
(function() {
'use strict';
var st = new ShardingTest({name: "remove_shard3", shards: 2, mongos: 2});
assert.commandWorked(st.s0.adminCommand({enableSharding: 'TestDB'}));
st.ensurePrimaryShard('TestDB', st.shard0.shardName);
assert.commandWorked(st.s0.adminCommand({shardCollection: 'TestDB.Coll', key: {_id: 1}}));
assert.commandWorked(st.s0.adminCommand({split: 'TestDB.Coll', middle: {_id: 0}}));
// Insert some documents and make sure there are docs on both shards
st.s0.getDB('TestDB').Coll.insert({_id: -1, value: 'Negative value'});
st.s0.getDB('TestDB').Coll.insert({_id: 1, value: 'Positive value'});
assert.commandWorked(st.s0.adminCommand(
{moveChunk: 'TestDB.Coll', find: {_id: 1}, to: st.shard1.shardName, _waitForDelete: true}));
// Make sure both mongos instances know of the latest metadata
assert.eq(2, st.s0.getDB('TestDB').Coll.find({}).toArray().length);
assert.eq(2, st.s1.getDB('TestDB').Coll.find({}).toArray().length);
// Remove st.shard1.shardName
var removeRes;
removeRes = assert.commandWorked(st.s0.adminCommand({removeShard: st.shard1.shardName}));
assert.eq('started', removeRes.state);
removeRes = assert.commandWorked(st.s0.adminCommand({removeShard: st.shard1.shardName}));
assert.eq('ongoing', removeRes.state);
// Move the one chunk off st.shard1.shardName
assert.commandWorked(st.s0.adminCommand(
{moveChunk: 'TestDB.Coll', find: {_id: 1}, to: st.shard0.shardName, _waitForDelete: true}));
// Remove shard must succeed now
removeRes = assert.commandWorked(st.s0.adminCommand({removeShard: st.shard1.shardName}));
assert.eq('completed', removeRes.state);
// Make sure both mongos instance refresh their metadata and do not reference the missing shard
assert.eq(2, st.s0.getDB('TestDB').Coll.find({}).toArray().length);
assert.eq(2, st.s1.getDB('TestDB').Coll.find({}).toArray().length);
st.stop();
})();
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