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/**
* Tests that commands that can be sent to secondaries for sharded collections can be "safe":
* - When non-'available' read concern is specified (local in this case), the secondary participates
* in the shard versioning protocol and filters returned documents using its routing table cache.
* - When 'available' read concern is specified, the secondary does not check shard version nor
* filters results.
* - When no read concern is specified, the secondary defaults to 'available' read concern.
*
* Since some commands are unversioned even against primaries or cannot be run on sharded
* collections, this file declaratively defines the expected behavior for each command.
*
* If versioned secondary reads do not apply to a command, it should specify "skip" with the reason.
*
* The following fields are required for each command that is not skipped:
*
* - setUp: A function that does any set up (inserts, etc.) needed to check the command's results.
* - command: The command to run, with all required options. Note, this field is also used to
* identify the operation in the system profiler.
* - checkResults: A function that asserts whether the command should succeed or fail. If the
* command is expected to succeed, the function should assert the expected results.
* *when the range has not been deleted from the donor.*
* - checkAvailableReadConcernResults: Same as checkResults above, except asserts the expected
* results for the command run with read concern 'available'.
* - behavior: Must be one of "unshardedOnly", "targetsPrimaryUsesConnectionVersioning",
* "unversioned", or "versioned". Determines what system profiler checks are performed.
*/
(function() {
"use strict";
load('jstests/libs/profiler.js');
let db = "test";
let coll = "foo";
let nss = db + "." + coll;
// Given a command, build its expected shape in the system profiler.
let buildCommandProfile = function(command) {
let commandProfile = {ns: nss};
if (command.mapReduce) {
// Unlike other read commands, mapReduce is rewritten to a different format when sent to
// shards if the input collection is sharded, because it is executed in two phases.
// We do not check for the 'map' and 'reduce' fields, because they are functions, and
// we cannot compaare functions for equality.
commandProfile["command.out"] = {$regex: "^tmp.mrs"};
commandProfile["command.shardedFirstPass"] = true;
} else {
for (let key in command) {
commandProfile["command." + key] = command[key];
}
}
return commandProfile;
};
// Check that a test case is well-formed.
let validateTestCase = function(test) {
assert(test.setUp && typeof(test.setUp) === "function");
assert(test.command && typeof(test.command) === "object");
assert(test.checkResults && typeof(test.checkResults) === "function");
assert(test.checkAvailableReadConcernResults &&
typeof(test.checkAvailableReadConcernResults) === "function");
assert(test.behavior === "unshardedOnly" || test.behavior === "unversioned" ||
test.behavior === "targetsPrimaryUsesConnectionVersioning" ||
test.behavior === "versioned");
};
let testCases = {
_configsvrAddShard: {skip: "primary only"},
_configsvrAddShardToZone: {skip: "primary only"},
_configsvrBalancerStart: {skip: "primary only"},
_configsvrBalancerStatus: {skip: "primary only"},
_configsvrBalancerStop: {skip: "primary only"},
_configsvrCommitChunkMerge: {skip: "primary only"},
_configsvrCommitChunkMigration: {skip: "primary only"},
_configsvrCommitChunkSplit: {skip: "primary only"},
_configsvrDropCollection: {skip: "primary only"},
_configsvrDropDatabase: {skip: "primary only"},
_configsvrMoveChunk: {skip: "primary only"},
_configsvrMovePrimary: {skip: "primary only"},
_configsvrRemoveShardFromZone: {skip: "primary only"},
_configsvrShardCollection: {skip: "primary only"},
_configsvrSetFeatureCompatibilityVersion: {skip: "primary only"},
_configsvrUpdateZoneKeyRange: {skip: "primary only"},
_flushRoutingTableCacheUpdates: {skip: "does not return user data"},
_getUserCacheGeneration: {skip: "does not return user data"},
_hashBSONElement: {skip: "does not return user data"},
_isSelf: {skip: "does not return user data"},
_mergeAuthzCollections: {skip: "primary only"},
_migrateClone: {skip: "primary only"},
_recvChunkAbort: {skip: "primary only"},
_recvChunkCommit: {skip: "primary only"},
_recvChunkStart: {skip: "primary only"},
_recvChunkStatus: {skip: "primary only"},
_transferMods: {skip: "primary only"},
addShard: {skip: "primary only"},
addShardToZone: {skip: "primary only"},
aggregate: {
setUp: function(mongosConn) {
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1}));
},
command: {aggregate: coll, pipeline: [{$match: {x: 1}}], cursor: {batchSize: 10}},
checkResults: function(res) {
// The command should work and return correct results.
assert.commandWorked(res);
assert.eq(1, res.cursor.firstBatch.length, tojson(res));
},
checkAvailableReadConcernResults: function(res) {
// The command should work and return orphaned results.
assert.commandWorked(res);
assert.eq(1, res.cursor.firstBatch.length, tojson(res));
},
behavior: "versioned"
},
appendOplogNote: {skip: "primary only"},
applyOps: {skip: "primary only"},
authenticate: {skip: "does not return user data"},
availableQueryOptions: {skip: "does not return user data"},
balancerStart: {skip: "primary only"},
balancerStatus: {skip: "primary only"},
balancerStop: {skip: "primary only"},
buildInfo: {skip: "does not return user data"},
captrunc: {skip: "primary only"},
checkShardingIndex: {skip: "primary only"},
cleanupOrphaned: {skip: "primary only"},
clearLog: {skip: "does not return user data"},
clone: {skip: "primary only"},
cloneCollection: {skip: "primary only"},
cloneCollectionAsCapped: {skip: "primary only"},
collMod: {skip: "primary only"},
collStats: {skip: "does not return user data"},
compact: {skip: "does not return user data"},
configureFailPoint: {skip: "does not return user data"},
connPoolStats: {skip: "does not return user data"},
connPoolSync: {skip: "does not return user data"},
connectionStatus: {skip: "does not return user data"},
convertToCapped: {skip: "primary only"},
copydb: {skip: "primary only"},
copydbsaslstart: {skip: "primary only"},
count: {
setUp: function(mongosConn) {
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1}));
},
command: {count: coll, query: {x: 1}},
checkResults: function(res) {
// The command should work and return correct results.
assert.commandWorked(res);
assert.eq(1, res.n, tojson(res));
},
checkAvailableReadConcernResults: function(res) {
// The command should work and return orphaned results.
assert.commandWorked(res);
assert.eq(1, res.n, tojson(res));
},
behavior: "versioned"
},
cpuload: {skip: "does not return user data"},
create: {skip: "primary only"},
createIndexes: {skip: "primary only"},
createRole: {skip: "primary only"},
createUser: {skip: "primary only"},
currentOp: {skip: "does not return user data"},
dataSize: {skip: "does not return user data"},
dbHash: {skip: "does not return user data"},
dbStats: {skip: "does not return user data"},
delete: {skip: "primary only"},
distinct: {
setUp: function(mongosConn) {
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1}));
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1}));
},
command: {distinct: coll, key: "x"},
checkResults: function(res) {
assert.commandWorked(res);
assert.eq(1, res.values.length, tojson(res));
},
checkAvailableReadConcernResults: function(res) {
// The command should work and return orphaned results.
assert.commandWorked(res);
assert.eq(1, res.values.length, tojson(res));
},
behavior: "versioned"
},
driverOIDTest: {skip: "does not return user data"},
drop: {skip: "primary only"},
dropAllRolesFromDatabase: {skip: "primary only"},
dropAllUsersFromDatabase: {skip: "primary only"},
dropDatabase: {skip: "primary only"},
dropIndexes: {skip: "primary only"},
dropRole: {skip: "primary only"},
dropUser: {skip: "primary only"},
emptycapped: {skip: "primary only"},
enableSharding: {skip: "primary only"},
endSessions: {skip: "does not return user data"},
eval: {skip: "primary only"},
explain: {skip: "TODO SERVER-30068"},
features: {skip: "does not return user data"},
filemd5: {skip: "does not return user data"},
find: {
setUp: function(mongosConn) {
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1}));
},
command: {find: coll, filter: {x: 1}},
checkResults: function(res) {
// The command should work and return correct results.
assert.commandWorked(res);
assert.eq(1, res.cursor.firstBatch.length, tojson(res));
},
checkAvailableReadConcernResults: function(res) {
// The command should work and return orphaned results.
assert.commandWorked(res);
assert.eq(1, res.cursor.firstBatch.length, tojson(res));
},
behavior: "versioned"
},
findAndModify: {skip: "primary only"},
flushRouterConfig: {skip: "does not return user data"},
forceerror: {skip: "does not return user data"},
fsync: {skip: "does not return user data"},
fsyncUnlock: {skip: "does not return user data"},
geoNear: {
setUp: function(mongosConn) {
assert.commandWorked(mongosConn.getCollection(nss).runCommand(
{createIndexes: coll, indexes: [{key: {loc: "2d"}, name: "loc_2d"}]}));
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1, loc: [1, 1]}));
},
command: {geoNear: coll, near: [1, 1]},
checkResults: function(res) {
assert.commandWorked(res);
// Expect the command to return correct results, since it will read orphaned data.
assert.eq(1, res.results.length, res);
},
checkAvailableReadConcernResults: function(res) {
assert.commandWorked(res);
// Command is unversioned, so 'available' has no additional effect.
assert.eq(1, res.results.length, res);
},
behavior: "unversioned"
},
geoSearch: {skip: "not supported in mongos"},
getCmdLineOpts: {skip: "does not return user data"},
getDiagnosticData: {skip: "does not return user data"},
getLastError: {skip: "primary only"},
getLog: {skip: "does not return user data"},
getMore: {skip: "shard version already established"},
getParameter: {skip: "does not return user data"},
getPrevError: {skip: "does not return user data"},
getShardMap: {skip: "does not return user data"},
getShardVersion: {skip: "primary only"},
getnonce: {skip: "does not return user data"},
godinsert: {skip: "for testing only"},
grantPrivilegesToRole: {skip: "primary only"},
grantRolesToRole: {skip: "primary only"},
grantRolesToUser: {skip: "primary only"},
group: {
setUp: function(mongosConn) {
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1, y: 1}));
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1, y: 1}));
assert.writeOK(mongosConn.getCollection(nss).insert({x: 2, y: 1}));
assert.writeOK(mongosConn.getCollection(nss).insert({x: 2, y: 1}));
},
command: {group: {ns: coll, key: {x: 1}}},
checkResults: function(res) {
// Expect the command to fail, since it cannot run on sharded collections.
assert.commandFailedWithCode(res, ErrorCodes.IllegalOperation, tojson(res));
},
checkAvailableReadConcernResults: function(res) {
// Expect the command to fail, since it cannot run on sharded collections.
assert.commandFailedWithCode(res, ErrorCodes.IllegalOperation, tojson(res));
},
behavior: "unshardedOnly"
},
handshake: {skip: "does not return user data"},
hostInfo: {skip: "does not return user data"},
insert: {skip: "primary only"},
invalidateUserCache: {skip: "does not return user data"},
isdbgrid: {skip: "does not return user data"},
isMaster: {skip: "does not return user data"},
journalLatencyTest: {skip: "does not return user data"},
killCursors: {skip: "does not return user data"},
killAllSessions: {skip: "does not return user data"},
killAllSessionsByPattern: {skip: "does not return user data"},
killOp: {skip: "does not return user data"},
killSessions: {skip: "does not return user data"},
listCollections: {skip: "primary only"},
listCommands: {skip: "does not return user data"},
listDatabases: {skip: "primary only"},
listIndexes: {skip: "primary only"},
listShards: {skip: "does not return user data"},
lockInfo: {skip: "primary only"},
logApplicationMessage: {skip: "primary only"},
logRotate: {skip: "does not return user data"},
logout: {skip: "does not return user data"},
makeSnapshot: {skip: "does not return user data"},
mapReduce: {
setUp: function(mongosConn) {
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1}));
assert.writeOK(mongosConn.getCollection(nss).insert({x: 1}));
},
command: {
mapReduce: coll,
map: function() {
emit(this.x, 1);
},
reduce: function(key, values) {
return Array.sum(values);
},
out: {inline: 1}
},
checkResults: function(res) {
assert.commandWorked(res);
assert.eq(1, res.results.length, tojson(res));
assert.eq(1, res.results[0]._id, tojson(res));
assert.eq(2, res.results[0].value, tojson(res));
},
checkAvailableReadConcernResults: function(res) {
assert.commandFailed(res);
},
behavior: "targetsPrimaryUsesConnectionVersioning"
},
mergeChunks: {skip: "primary only"},
moveChunk: {skip: "primary only"},
movePrimary: {skip: "primary only"},
multicast: {skip: "does not return user data"},
netstat: {skip: "does not return user data"},
parallelCollectionScan: {skip: "is an internal command"},
ping: {skip: "does not return user data"},
planCacheClear: {skip: "does not return user data"},
planCacheClearFilters: {skip: "does not return user data"},
planCacheListFilters: {skip: "does not return user data"},
planCacheListPlans: {skip: "does not return user data"},
planCacheListQueryShapes: {skip: "does not return user data"},
planCacheSetFilter: {skip: "does not return user data"},
profile: {skip: "primary only"},
reIndex: {skip: "does not return user data"},
reapLogicalSessionCacheNow: {skip: "does not return user data"},
refreshLogicalSessionCacheNow: {skip: "does not return user data"},
refreshSessions: {skip: "does not return user data"},
refreshSessionsInternal: {skip: "does not return user data"},
removeShard: {skip: "primary only"},
removeShardFromZone: {skip: "primary only"},
renameCollection: {skip: "primary only"},
repairCursor: {skip: "does not return user data"},
repairDatabase: {skip: "does not return user data"},
replSetAbortPrimaryCatchUp: {skip: "does not return user data"},
replSetElect: {skip: "does not return user data"},
replSetFreeze: {skip: "does not return user data"},
replSetFresh: {skip: "does not return user data"},
replSetGetConfig: {skip: "does not return user data"},
replSetGetRBID: {skip: "does not return user data"},
replSetGetStatus: {skip: "does not return user data"},
replSetHeartbeat: {skip: "does not return user data"},
replSetInitiate: {skip: "does not return user data"},
replSetMaintenance: {skip: "does not return user data"},
replSetReconfig: {skip: "does not return user data"},
replSetRequestVotes: {skip: "does not return user data"},
replSetStepDown: {skip: "does not return user data"},
replSetStepUp: {skip: "does not return user data"},
replSetSyncFrom: {skip: "does not return user data"},
replSetTest: {skip: "does not return user data"},
replSetUpdatePosition: {skip: "does not return user data"},
replSetResizeOplog: {skip: "does not return user data"},
resetError: {skip: "does not return user data"},
resync: {skip: "primary only"},
revokePrivilegesFromRole: {skip: "primary only"},
revokeRolesFromRole: {skip: "primary only"},
revokeRolesFromUser: {skip: "primary only"},
rolesInfo: {skip: "primary only"},
saslContinue: {skip: "primary only"},
saslStart: {skip: "primary only"},
serverStatus: {skip: "does not return user data"},
setCommittedSnapshot: {skip: "does not return user data"},
setFeatureCompatibilityVersion: {skip: "primary only"},
setParameter: {skip: "does not return user data"},
setShardVersion: {skip: "does not return user data"},
shardCollection: {skip: "primary only"},
shardConnPoolStats: {skip: "does not return user data"},
shardingState: {skip: "does not return user data"},
shutdown: {skip: "does not return user data"},
sleep: {skip: "does not return user data"},
split: {skip: "primary only"},
splitChunk: {skip: "primary only"},
splitVector: {skip: "primary only"},
stageDebug: {skip: "primary only"},
startSession: {skip: "does not return user data"},
top: {skip: "does not return user data"},
touch: {skip: "does not return user data"},
unsetSharding: {skip: "does not return user data"},
update: {skip: "primary only"},
updateRole: {skip: "primary only"},
updateUser: {skip: "primary only"},
updateZoneKeyRange: {skip: "primary only"},
usersInfo: {skip: "primary only"},
validate: {skip: "does not return user data"},
whatsmyuri: {skip: "does not return user data"}
};
// Set the secondaries to priority 0 and votes 0 to prevent the primaries from stepping down.
let rsOpts = {nodes: [{rsConfig: {votes: 1}}, {rsConfig: {priority: 0, votes: 0}}]};
let st = new ShardingTest({mongos: 2, shards: {rs0: rsOpts, rs1: rsOpts}});
let donorShardPrimary = st.rs0.getPrimary();
let recipientShardPrimary = st.rs1.getPrimary();
let donorShardSecondary = st.rs0.getSecondary();
let recipientShardSecondary = st.rs1.getSecondary();
let freshMongos = st.s0;
let staleMongos = st.s1;
let res = st.s.adminCommand({listCommands: 1});
assert.commandWorked(res);
let commands = Object.keys(res.commands);
for (let command of commands) {
let test = testCases[command];
assert(test !== undefined,
"coverage failure: must define a safe secondary reads test for " + command);
if (test.skip !== undefined) {
print("skipping " + command + ": " + test.skip);
continue;
}
validateTestCase(test);
jsTest.log("testing command " + tojson(test.command));
assert.commandWorked(freshMongos.adminCommand({enableSharding: db}));
st.ensurePrimaryShard(db, st.shard0.shardName);
assert.commandWorked(freshMongos.adminCommand({shardCollection: nss, key: {x: 1}}));
assert.commandWorked(freshMongos.adminCommand({split: nss, middle: {x: 0}}));
// Do dummy read from the stale mongos so it loads the routing table into memory once.
// Additionally, do a secondary read to ensure that the secondary has loaded the initial
// routing table -- the first read to the primary will refresh the mongos' shardVersion,
// which will then be used against the secondary to ensure the secondary is fresh.
assert.commandWorked(staleMongos.getDB(db).runCommand({find: coll}));
assert.commandWorked(freshMongos.getDB(db).runCommand(
{find: coll, $readPreference: {mode: 'secondary'}, readConcern: {'level': 'local'}}));
// Do any test-specific setup.
test.setUp(staleMongos);
assert.commandWorked(recipientShardPrimary.getDB(db).setProfilingLevel(2));
assert.commandWorked(donorShardSecondary.getDB(db).setProfilingLevel(2));
assert.commandWorked(recipientShardSecondary.getDB(db).setProfilingLevel(2));
// Suspend range deletion on the donor shard.
donorShardPrimary.adminCommand(
{configureFailPoint: 'suspendRangeDeletion', mode: 'alwaysOn'});
// Do a moveChunk from the fresh mongos to make the other mongos stale.
// Use {w:2} (all) write concern so the metadata change gets persisted to the secondary
// before stalely versioned commands are sent against the secondary.
assert.commandWorked(freshMongos.adminCommand({
moveChunk: nss,
find: {x: 0},
to: st.shard1.shardName,
_secondaryThrottle: true,
writeConcern: {w: 2},
}));
let cmdReadPrefSecondary =
Object.assign({}, test.command, {$readPreference: {mode: 'secondary'}});
let cmdPrefSecondaryConcernAvailable =
Object.assign({}, cmdReadPrefSecondary, {readConcern: {level: 'available'}});
let cmdPrefSecondaryConcernLocal =
Object.assign({}, cmdReadPrefSecondary, {readConcern: {level: 'local'}});
let availableReadConcernRes =
staleMongos.getDB(db).runCommand(cmdPrefSecondaryConcernAvailable);
test.checkAvailableReadConcernResults(availableReadConcernRes);
let defaultReadConcernRes = staleMongos.getDB(db).runCommand(cmdReadPrefSecondary);
if (command === 'mapReduce') {
// mapReduce is always sent to a primary, which defaults to 'local' readConcern
test.checkResults(defaultReadConcernRes);
} else {
// Secondaries default to the 'available' readConcern
test.checkAvailableReadConcernResults(defaultReadConcernRes);
}
let localReadConcernRes = staleMongos.getDB(db).runCommand(cmdPrefSecondaryConcernLocal);
test.checkResults(localReadConcernRes);
// Build the query to identify the command in the system profiler.
let commandProfile = buildCommandProfile(test.command);
if (test.behavior === "unshardedOnly") {
// Check that neither the donor nor recipient shard secondaries received either request.
profilerHasZeroMatchingEntriesOrThrow(
{profileDB: donorShardSecondary.getDB(db), filter: commandProfile});
profilerHasZeroMatchingEntriesOrThrow(
{profileDB: recipientShardSecondary.getDB(db), filter: commandProfile});
} else if (test.behavior === "unversioned") {
// Check that the donor shard secondary received both requests *without* an attached
// shardVersion and returned success for both.
profilerHasSingleMatchingEntryOrThrow({
profileDB: donorShardSecondary.getDB(db),
filter: Object.extend({
"command.shardVersion": {"$exists": false},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern": {"level": 'available'},
"exceptionCode": {"$ne": ErrorCodes.StaleConfig},
},
commandProfile)
});
profilerHasSingleMatchingEntryOrThrow({
profileDB: donorShardSecondary.getDB(db),
filter: Object.extend({
"command.shardVersion": {"$exists": false},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern": {"level": "local"},
"exceptionCode": {"$ne": ErrorCodes.StaleConfig},
},
commandProfile)
});
// Check that the recipient shard secondary did not receive either request.
profilerHasZeroMatchingEntriesOrThrow(
{profileDB: recipientShardSecondary.getDB(db), filter: commandProfile});
} else if (test.behavior === "targetsPrimaryUsesConnectionVersioning") {
// Check that the recipient shard primary received the request without a shardVersion
// field and returned success.
profilerHasSingleMatchingEntryOrThrow({
profileDB: recipientShardPrimary.getDB(db),
filter: Object.extend({
"command.shardVersion": {"$exists": false},
"command.$readPreference": {$exists: false},
"command.readConcern": {"level": "local"},
"exceptionCode": {"$exists": false},
},
commandProfile)
});
} else if (test.behavior === "versioned") {
// Check that the donor shard secondary received both the 'available' read concern
// request and read concern not specified request and returned success for both, despite
// the mongos' stale routing table.
profilerHasSingleMatchingEntryOrThrow({
profileDB: donorShardSecondary.getDB(db),
filter: Object.extend({
"command.shardVersion": {"$exists": true},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern": {"level": "available"},
"exceptionCode": {"$ne": ErrorCodes.StaleConfig},
},
commandProfile)
});
profilerHasSingleMatchingEntryOrThrow({
profileDB: donorShardSecondary.getDB(db),
filter: Object.extend({
"command.shardVersion": {"$exists": true},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern": {"$exists": false},
"exceptionCode": {"$ne": ErrorCodes.StaleConfig},
},
commandProfile)
});
// Check that the donor shard secondary then returned stale shardVersion for the request
// with local read concern.
profilerHasSingleMatchingEntryOrThrow({
profileDB: donorShardSecondary.getDB(db),
filter: Object.extend({
"command.shardVersion": {"$exists": true},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern": {"level": "local"},
"exceptionCode": ErrorCodes.StaleConfig
},
commandProfile)
});
// Check that the recipient shard secondary received the request with local read concern
// and also returned stale shardVersion once, even though the mongos is fresh, because
// the secondary was stale.
profilerHasSingleMatchingEntryOrThrow({
profileDB: recipientShardSecondary.getDB(db),
filter: Object.extend({
"command.shardVersion": {"$exists": true},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern": {"level": "local"},
"exceptionCode": ErrorCodes.StaleConfig
},
commandProfile)
});
// Check that the recipient shard secondary received the request with local read concern
// again and finally returned success.
profilerHasSingleMatchingEntryOrThrow({
profileDB: recipientShardSecondary.getDB(db),
filter: Object.extend({
"command.shardVersion": {"$exists": true},
"command.$readPreference": {"mode": "secondary"},
"command.readConcern": {"level": "local"},
"exceptionCode": {"$ne": ErrorCodes.StaleConfig},
},
commandProfile)
});
}
donorShardPrimary.adminCommand({configureFailPoint: 'suspendRangeDeletion', mode: 'off'});
// Clean up the collection by dropping the DB. This also drops all associated indexes and
// clears the profiler collection.
// Do this from staleMongos, so staleMongos purges the database entry from its cache.
assert.commandWorked(staleMongos.getDB(db).runCommand({dropDatabase: 1}));
}
st.stop();
})();
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