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// Test that open transactions block DDL operations on the involved collections.
// @tags: [uses_transactions]
(function() {
"use strict";
load("jstests/libs/parallelTester.js"); // for ScopedThread.
const dbName = "transactions_block_ddl";
const collName = "transactions_block_ddl";
const otherDBName = "transactions_block_ddl_other";
const otherCollName = "transactions_block_ddl_other";
const testDB = db.getSiblingDB(dbName);
const session = testDB.getMongo().startSession({causalConsistency: false});
const sessionDB = session.getDatabase(dbName);
const sessionColl = sessionDB[collName];
/**
* Tests that DDL operations block on transactions and fail when their maxTimeMS expires.
*/
function testTimeout(cmdDBName, ddlCmd) {
// Setup.
sessionDB.runCommand({drop: collName, writeConcern: {w: "majority"}});
assert.commandWorked(sessionColl.createIndex({b: 1}, {name: "b_1"}));
session.startTransaction();
assert.commandWorked(sessionColl.insert({a: 5, b: 6}));
assert.commandFailedWithCode(
testDB.getSiblingDB(cmdDBName).runCommand(Object.assign({}, ddlCmd, {maxTimeMS: 500})),
ErrorCodes.ExceededTimeLimit);
assert.commandWorked(session.commitTransaction_forTesting());
}
/**
* Tests that DDL operations block on transactions but can succeed once the transaction commits.
*/
function testSuccessOnTxnCommit(cmdDBName, ddlCmd, currentOpFilter) {
// Setup.
sessionDB.runCommand({drop: collName, writeConcern: {w: "majority"}});
assert.commandWorked(sessionColl.createIndex({b: 1}, {name: "b_1"}));
session.startTransaction();
assert.commandWorked(sessionColl.insert({a: 5, b: 6}));
let thread = new ScopedThread(function(testData, cmdDBName, ddlCmd) {
TestData = testData;
return db.getSiblingDB(cmdDBName).runCommand(ddlCmd);
}, TestData, cmdDBName, ddlCmd);
thread.start();
// Wait for the DDL operation to have pending locks.
assert.soon(
function() {
// Note that we cannot use the $currentOp agg stage because it acquires locks
// (SERVER-35289).
return testDB.currentOp({$and: [currentOpFilter, {waitingForLock: true}]})
.inprog.length === 1;
},
function() {
return "Failed to find DDL command in currentOp output: " +
tojson(testDB.currentOp().inprog);
});
assert.commandWorked(session.commitTransaction_forTesting());
thread.join();
assert.commandWorked(thread.returnData());
}
// Test 'drop'.
const dropCmd = {drop: collName, writeConcern: {w: "majority"}};
testTimeout(dbName, dropCmd);
testSuccessOnTxnCommit(dbName, dropCmd, {"command.drop": collName});
// Test 'dropDatabase'.
// We cannot run testTimeout() for dropDatabase, since dropDatabase does not respect maxTimeMS
// TODO SERVER-35290: Run testTimeout() for dropDatabase.
const dropDatabaseCmd = {dropDatabase: 1, writeConcern: {w: "majority"}};
testSuccessOnTxnCommit(dbName, dropDatabaseCmd, {"command.dropDatabase": 1});
// Test 'renameCollection' in the same database.
testDB.runCommand({drop: otherCollName, writeConcern: {w: "majority"}});
const renameCollectionCmdSameDB = {
renameCollection: sessionColl.getFullName(),
to: dbName + "." + otherCollName,
writeConcern: {w: "majority"}
};
testTimeout("admin", renameCollectionCmdSameDB);
testSuccessOnTxnCommit("admin",
renameCollectionCmdSameDB,
{"command.renameCollection": sessionColl.getFullName()});
// Test 'renameCollection' across databases.
testDB.getSiblingDB(otherDBName)
.runCommand({drop: otherCollName, writeConcern: {w: "majority"}});
const renameCollectionCmdDifferentDB = {
renameCollection: sessionColl.getFullName(),
to: otherDBName + "." + otherCollName,
writeConcern: {w: "majority"}
};
testTimeout("admin", renameCollectionCmdDifferentDB);
testSuccessOnTxnCommit("admin",
renameCollectionCmdDifferentDB,
{"command.renameCollection": sessionColl.getFullName()});
// Test 'createIndexes'. The transaction will insert a document that has a field 'a'.
const createIndexesCmd = {
createIndexes: collName,
indexes: [{key: {a: 1}, name: "a_1"}],
writeConcern: {w: "majority"}
};
testTimeout(dbName, createIndexesCmd);
testSuccessOnTxnCommit(dbName, createIndexesCmd, {"command.createIndexes": collName});
// Test 'dropIndexes'. The setup creates an index on {b: 1} called 'b_1'. The transaction will
// insert a document that has a field 'b'.
const dropIndexesCmd = {dropIndexes: collName, index: "b_1", writeConcern: {w: "majority"}};
testTimeout(dbName, dropIndexesCmd);
testSuccessOnTxnCommit(dbName, dropIndexesCmd, {"command.dropIndexes": collName});
session.endSession();
}());
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