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/**
* Tests that a collection with allowMigrations: false in config.collections prohibits committing a
* moveChunk and disables the balancer.
* Also tests that the _configsvrSetAllowMigrations commands updates the 'allowMigrations' field and
* bumps the collection version.
*
* @tags: [
* does_not_support_stepdowns,
* ]
*/
(function() {
'use strict';
load("jstests/libs/feature_flag_util.js");
load('jstests/libs/fail_point_util.js');
load('jstests/libs/parallel_shell_helpers.js');
load("jstests/sharding/libs/find_chunks_util.js");
load("jstests/sharding/libs/shard_versioning_util.js");
const st = new ShardingTest({shards: 2, other: {chunkSize: 1}});
const configDB = st.s.getDB("config");
// Resets database dbName and enables sharding and establishes shard0 as primary, test case agnostic
function setUpDatabaseAndEnableSharding(dbName) {
assert.commandWorked(st.s.getDB(dbName).dropDatabase());
assert.commandWorked(st.s.adminCommand({enableSharding: dbName}));
assert.commandWorked(st.s.adminCommand({movePrimary: dbName, to: st.shard0.shardName}));
return dbName;
}
// Test the _configsvrSetAllowMigrations internal command directly
(function testConfigsvrSetAllowMigrationsCommand() {
jsTestLog('Running ConfigsvrSetAllowMigrationsCommand');
const dbName = setUpDatabaseAndEnableSharding('ConfigsvrSetAllowMigrationsCommand');
const collName = "foo";
const ns = dbName + "." + collName;
assert.commandWorked(st.s.adminCommand({shardCollection: ns, key: {x: 1}}));
ShardVersioningUtil.assertCollectionVersionEquals(st.shard0, ns, Timestamp(1, 0));
// Use _configsvrSetAllowMigrations to forbid migrations from happening
assert.commandWorked(st.configRS.getPrimary().adminCommand(
{_configsvrSetAllowMigrations: ns, allowMigrations: false, writeConcern: {w: "majority"}}));
// Check that allowMigrations has been set to 'false' on the configsvr config.collections.
assert.eq(false, configDB.collections.findOne({_id: ns}).allowMigrations);
// Check that the collection version has been bumped and the shard has refreshed.
ShardVersioningUtil.assertCollectionVersionEquals(st.shard0, ns, Timestamp(1, 1));
// Use _configsvrSetAllowMigrations to allow migrations to happen
assert.commandWorked(st.configRS.getPrimary().adminCommand(
{_configsvrSetAllowMigrations: ns, allowMigrations: true, writeConcern: {w: "majority"}}));
// Check that allowMigrations has been unset (that implies migrations are allowed) on the
// configsvr config.collections.
assert.eq(undefined, configDB.collections.findOne({_id: ns}).allowMigrations);
// Check that the collection version has been bumped and the shard has refreshed.
ShardVersioningUtil.assertCollectionVersionEquals(st.shard0, ns, Timestamp(1, 2));
// Check that _configsvrSetAllowMigrations validates the 'collectionUUID' parameter if passed
const collectionUUID = configDB.collections.findOne({_id: ns}).uuid;
const anotherUUID = UUID();
assert.commandFailedWithCode(st.configRS.getPrimary().adminCommand({
_configsvrSetAllowMigrations: ns,
allowMigrations: false,
collectionUUID: anotherUUID,
writeConcern: {w: "majority"}
}),
ErrorCodes.InvalidUUID);
assert.eq(undefined, configDB.collections.findOne({_id: ns}).allowMigrations);
// Check that the collection version has not changed.
ShardVersioningUtil.assertCollectionVersionEquals(st.shard0, ns, Timestamp(1, 2));
// Check that _configsvrSetAllowMigrations validates the 'collectionUUID' parameter if passed
assert.commandWorked(st.configRS.getPrimary().adminCommand({
_configsvrSetAllowMigrations: ns,
allowMigrations: false,
collectionUUID: collectionUUID,
writeConcern: {w: "majority"}
}));
assert.eq(false, configDB.collections.findOne({_id: ns}).allowMigrations);
// Check that the collection version has been bumped and the shard has refreshed.
ShardVersioningUtil.assertCollectionVersionEquals(st.shard0, ns, Timestamp(1, 3));
})();
// Tests that moveChunk does not succeed when {allowMigrations: false}
(function testAllowMigrationsFalsePreventsMoveChunk() {
jsTestLog('Running AllowMigrationsFalsePreventsMoveChunk');
const dbName = setUpDatabaseAndEnableSharding('AllowMigrationsFalsePreventsMoveChunk');
const collName = "collA";
const ns = dbName + "." + collName;
assert.commandWorked(st.s.adminCommand({shardCollection: ns, key: {_id: 1}}));
assert.commandWorked(st.s.getDB(dbName).getCollection(collName).insert({_id: 0}));
assert.commandWorked(st.s.getDB(dbName).getCollection(collName).insert({_id: 1}));
// Confirm that an inProgress moveChunk fails once {allowMigrations: false}
const fp = configureFailPoint(st.shard0, "moveChunkHangAtStep4");
const awaitResult = startParallelShell(
funWithArgs(function(ns, toShardName) {
assert.commandFailedWithCode(
db.adminCommand({moveChunk: ns, find: {_id: 0}, to: toShardName}),
[ErrorCodes.ConflictingOperationInProgress, ErrorCodes.Interrupted]);
}, ns, st.shard1.shardName), st.s.port);
fp.wait();
assert.commandWorked(st.configRS.getPrimary().adminCommand(
{_configsvrSetAllowMigrations: ns, allowMigrations: false, writeConcern: {w: "majority"}}));
fp.off();
awaitResult();
// {allowMigrations: false} is set, sending a new moveChunk command should also fail.
assert.commandFailedWithCode(
st.s.adminCommand({moveChunk: ns, find: {_id: 0}, to: st.shard1.shardName}),
ErrorCodes.ConflictingOperationInProgress);
// Confirm shard0 reports {allowMigrations: false} in the local cache as well
const cachedEntry = st.shard0.getDB("config").cache.collections.findOne({_id: ns});
assert.eq(false, cachedEntry.allowMigrations);
})();
// Tests {allowMigrations: false} disables balancing for collB and does not interfere with balancing
// for collA.
//
// collBSetParams specify the field(s) that will be set on the collB in config.collections.
function testAllowMigrationsFalseDisablesBalancer(allowMigrations, collBSetNoBalanceParam) {
jsTestLog(`Running AllowMigrationsFalseDisablesBalancer(${allowMigrations}, ${
tojson(collBSetNoBalanceParam)})`);
const dbName = setUpDatabaseAndEnableSharding('AllowMigrationsFalseDisablesBalancer');
const collAName = "collA";
const collBName = "collB";
const collA = st.s.getCollection(`${dbName}.${collAName}`);
const collB = st.s.getCollection(`${dbName}.${collBName}`);
assert.commandWorked(st.s.adminCommand({shardCollection: collA.getFullName(), key: {_id: 1}}));
assert.commandWorked(st.s.adminCommand({shardCollection: collB.getFullName(), key: {_id: 1}}));
const bigString = 'X'.repeat(1024 * 1024); // 1MB
// Split both collections into 4 chunks so balancing can occur.
for (let coll of [collA, collB]) {
coll.insert({_id: 1, s: bigString});
coll.insert({_id: 10, s: bigString});
coll.insert({_id: 20, s: bigString});
coll.insert({_id: 30, s: bigString});
assert.commandWorked(st.splitAt(coll.getFullName(), {_id: 10}));
assert.commandWorked(st.splitAt(coll.getFullName(), {_id: 20}));
assert.commandWorked(st.splitAt(coll.getFullName(), {_id: 30}));
// Confirm the chunks are initially unbalanced. All chunks should start out on shard0
// (primary shard for the database).
const balancerStatus = assert.commandWorked(
st.s0.adminCommand({balancerCollectionStatus: coll.getFullName()}));
assert.eq(balancerStatus.balancerCompliant, false);
assert.eq(balancerStatus.firstComplianceViolation, 'chunksImbalance');
assert.eq(4,
findChunksUtil
.findChunksByNs(configDB, coll.getFullName(), {shard: st.shard0.shardName})
.count());
}
assert.commandWorked(
configDB.collections.update({_id: collB.getFullName()}, {$set: collBSetNoBalanceParam}));
assert.commandWorked(st.configRS.getPrimary().adminCommand({
_configsvrSetAllowMigrations: collB.getFullName(),
allowMigrations: allowMigrations,
writeConcern: {w: "majority"}
}));
st.startBalancer();
st.awaitBalance(collAName, dbName, 10 * 60000 /* 10min timeout */);
st.stopBalancer();
st.verifyCollectionIsBalanced(collA);
const collABalanceStatus =
assert.commandWorked(st.s.adminCommand({balancerCollectionStatus: collA.getFullName()}));
assert.eq(collABalanceStatus.balancerCompliant, true);
// Test that collB remains unbalanced.
const collBBalanceStatus =
assert.commandWorked(st.s.adminCommand({balancerCollectionStatus: collB.getFullName()}));
assert.eq(collBBalanceStatus.balancerCompliant, false);
assert.eq(collBBalanceStatus.firstComplianceViolation, 'chunksImbalance');
assert.eq(
4,
findChunksUtil.findChunksByNs(configDB, collB.getFullName(), {shard: st.shard0.shardName})
.count());
}
// Test cases that should disable the balancer.
testAllowMigrationsFalseDisablesBalancer(false /* allowMigrations */, {});
testAllowMigrationsFalseDisablesBalancer(false /* allowMigrations */, {noBalance: false});
testAllowMigrationsFalseDisablesBalancer(false /* allowMigrations */, {noBalance: true});
st.stop();
})();
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