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'use strict';
/**
* Perform continuous renames on 3 collections per database, with the objective to verify that:
* - Upon successful renames, no data are lost
* - Upon unsuccessful renames, no unexpected exception is thrown. Admitted errors:
* ---- NamespaceNotFound (tried to rename a random non-existing collection)
* ---- ConflictingOperationInProgress (tried to perform concurrent renames on the same source
* collection with different target collections)
* - The aforementioned acceptable exceptions must be thrown at least once, given the high level of
* concurrency
*
* @tags: [
* requires_sharding,
* # TODO (SERVER-56879): Support add/remove shards in new DDL paths
* does_not_support_add_remove_shards,
* # This test just performs rename operations that can't be executed in transactions
* does_not_support_transactions,
* # Can be removed once PM-1965-Milestone-1 is completed.
* ]
*/
const numChunks = 20;
const documentsPerChunk = 5;
const dbNames = ['db0', 'db1'];
const collNames =
['rename_sharded_collectionA', 'rename_sharded_collectionB', 'rename_sharded_collectionC'];
/*
* Initialize a collection with expected number of chunks/documents and randomly distribute chunks
*/
function initAndFillShardedCollection(db, collName, shardNames) {
const coll = db[collName];
const ns = coll.getFullName();
db.adminCommand({shardCollection: ns, key: {x: 1}});
var nextShardKeyValue = 0;
for (var i = 0; i < numChunks; i++) {
for (var j = 0; j < documentsPerChunk; j++) {
coll.insert({x: nextShardKeyValue++});
}
// Need to retry split command to avoid conflicting with moveChunks issued by the balancer.
assert.soonNoExcept(() => {
assert.commandWorked(db.adminCommand({split: ns, middle: {x: nextShardKeyValue}}));
return true;
});
const lastInsertedShardKeyValue = nextShardKeyValue - 1;
// When balancer is enabled, move chunks could overlap and fail with
// ConflictingOperationInProgress
const res = db.adminCommand({
moveChunk: ns,
find: {x: lastInsertedShardKeyValue},
to: shardNames[Random.randInt(shardNames.length)],
});
assert.commandWorkedOrFailedWithCode(res, ErrorCodes.ConflictingOperationInProgress);
}
}
/*
* Get a random db/coll name from the test lists.
*
* Using the thread id to introduce more randomness: it has been observed that concurrent calls to
* Random.randInt(array.length) are returning too often the same number to different threads.
*/
function getRandomDbName(tid) {
return dbNames[Random.randInt(tid * tid) % dbNames.length];
}
function getRandomCollName(tid) {
return collNames[Random.randInt(tid * tid) % collNames.length];
}
/*
* Keep track of raised exceptions in a collection to be checked during teardown.
*/
const expectedExceptions =
[ErrorCodes.NamespaceNotFound, ErrorCodes.ConflictingOperationInProgress];
const logExceptionsDBName = 'exceptions';
const logExceptionsCollName = 'log';
function logException(db, exceptionCode) {
db = db.getSiblingDB(logExceptionsDBName);
const coll = db[logExceptionsCollName];
assert.commandWorked(coll.insert({code: exceptionCode}));
}
function checkExceptionHasBeenThrown(db, exceptionCode) {
db = db.getSiblingDB(logExceptionsDBName);
const coll = db[logExceptionsCollName];
const count = coll.countDocuments({code: exceptionCode});
assert.gte(count, 1, 'No exception with error code ' + exceptionCode + ' has been thrown');
}
var $config = (function() {
let states = {
rename: function(db, collName, connCache) {
const dbName = getRandomDbName(this.threadCount);
db = db.getSiblingDB(dbName);
collName = getRandomCollName(this.threadCount);
var srcColl = db[collName];
const destCollName = getRandomCollName(this.threadCount);
try {
assertAlways.commandWorked(srcColl.renameCollection(destCollName));
} catch (e) {
const exceptionCode = e.code;
if (exceptionCode == ErrorCodes.IllegalOperation) {
assert.eq(
collName,
destCollName,
"The FSM thread can fail with IllegalOperation just if a rename collection is happening on the same collection.");
return;
}
if (exceptionCode) {
logException(db, exceptionCode);
if (expectedExceptions.includes(exceptionCode)) {
return;
}
}
throw e;
}
}
};
let setup = function(db, collName, cluster) {
const shardNames = Object.keys(cluster.getSerializedCluster().shards);
const numShards = shardNames.length;
// Initialize databases
for (var i = 0; i < dbNames.length; i++) {
const dbName = dbNames[i];
const newDb = db.getSiblingDB(dbName);
newDb.adminCommand({enablesharding: dbName, primaryShard: shardNames[i % numShards]});
// Initialize one sharded collection per db
initAndFillShardedCollection(
newDb, collNames[Random.randInt(collNames.length)], shardNames);
}
};
let teardown = function(db, collName, cluster) {
// Ensure that NamespaceNotFound and ConflictingOperationInProgress have been raised at
// least once: with a high level of concurrency, it's too improbable for such exceptions to
// never be thrown (in that case, it's very likely that a bug has been introduced).
expectedExceptions.forEach(errCode => checkExceptionHasBeenThrown(db, errCode));
// Check that at most one collection per test DB is present and that no data has been lost
// upon multiple renames.
for (var i = 0; i < dbNames.length; i++) {
const dbName = dbNames[i];
db = db.getSiblingDB(dbName);
const listColl = db.getCollectionNames();
assert.eq(1, listColl.length);
collName = listColl[0];
const numDocs = db[collName].countDocuments({});
assert.eq(numChunks * documentsPerChunk, numDocs, 'Unexpected number of chunks');
}
};
let transitions = {rename: {rename: 1.0}};
return {
threadCount: 12,
iterations: 64,
startState: 'rename',
states: states,
transitions: transitions,
data: {},
setup: setup,
teardown: teardown,
passConnectionCache: true
};
})();
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