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// Ensures that two manual moveChunk commands for the same collection will proceed in parallel so
// long as they do not touch the same shards
load('./jstests/libs/chunk_manipulation_util.js');
(function() {
'use strict';
// For startParallelOps to write its state
var staticMongod = MongoRunner.runMongod({});
var st = new ShardingTest({shards: 4});
assert.commandWorked(st.s0.adminCommand({enableSharding: 'TestDB'}));
st.ensurePrimaryShard('TestDB', st.shard0.shardName);
assert.commandWorked(st.s0.adminCommand({shardCollection: 'TestDB.TestColl', key: {Key: 1}}));
var coll = st.s0.getDB('TestDB').TestColl;
// Create 4 chunks initially
assert.commandWorked(coll.insert({Key: 1, Value: 'Test value 1'}));
assert.commandWorked(coll.insert({Key: 10, Value: 'Test value 10'}));
assert.commandWorked(coll.insert({Key: 20, Value: 'Test value 20'}));
assert.commandWorked(coll.insert({Key: 30, Value: 'Test value 30'}));
assert.commandWorked(st.splitAt('TestDB.TestColl', {Key: 10}));
assert.commandWorked(st.splitAt('TestDB.TestColl', {Key: 20}));
assert.commandWorked(st.splitAt('TestDB.TestColl', {Key: 30}));
// Move two of the chunks to st.shard1.shardName so we have option to do parallel balancing
assert.commandWorked(st.moveChunk('TestDB.TestColl', {Key: 20}, st.shard1.shardName));
assert.commandWorked(st.moveChunk('TestDB.TestColl', {Key: 30}, st.shard1.shardName));
assert.eq(2,
st.s0.getDB('config')
.chunks.find({ns: 'TestDB.TestColl', shard: st.shard0.shardName})
.itcount());
assert.eq(2,
st.s0.getDB('config')
.chunks.find({ns: 'TestDB.TestColl', shard: st.shard1.shardName})
.itcount());
// Pause migrations at shards 2 and 3
pauseMigrateAtStep(st.shard2, migrateStepNames.rangeDeletionTaskScheduled);
pauseMigrateAtStep(st.shard3, migrateStepNames.rangeDeletionTaskScheduled);
// Both move chunk operations should proceed
var joinMoveChunk1 = moveChunkParallel(
staticMongod, st.s0.host, {Key: 10}, null, 'TestDB.TestColl', st.shard2.shardName);
var joinMoveChunk2 = moveChunkParallel(
staticMongod, st.s0.host, {Key: 30}, null, 'TestDB.TestColl', st.shard3.shardName);
waitForMigrateStep(st.shard2, migrateStepNames.rangeDeletionTaskScheduled);
waitForMigrateStep(st.shard3, migrateStepNames.rangeDeletionTaskScheduled);
unpauseMigrateAtStep(st.shard2, migrateStepNames.rangeDeletionTaskScheduled);
unpauseMigrateAtStep(st.shard3, migrateStepNames.rangeDeletionTaskScheduled);
joinMoveChunk1();
joinMoveChunk2();
assert.eq(1,
st.s0.getDB('config')
.chunks.find({ns: 'TestDB.TestColl', shard: st.shard0.shardName})
.itcount());
assert.eq(1,
st.s0.getDB('config')
.chunks.find({ns: 'TestDB.TestColl', shard: st.shard1.shardName})
.itcount());
assert.eq(1,
st.s0.getDB('config')
.chunks.find({ns: 'TestDB.TestColl', shard: st.shard2.shardName})
.itcount());
assert.eq(1,
st.s0.getDB('config')
.chunks.find({ns: 'TestDB.TestColl', shard: st.shard3.shardName})
.itcount());
st.stop();
MongoRunner.stopMongod(staticMongod);
})();
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