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/*
* Tests that we don't hit 3 way deadlock between an index builder, prepared transaction, and step
* down.
*
* This tests the following scenario:
* 1) Starts and index build.
* 2) Prepares a transaction which holds the collection lock in IX mode.
* 3) Waits for the index build to attempt to acquire the collection lock in S mode to stop writes,
* but blocks behind the prepared transaction due to a collection lock conflict.
* 4) Steps down the primary, which enqueues the RSTL in X mode.
* 5) Ensures the index build has released its RSTL lock before taking the MODE_S lock, and does not
* block stepDown.
*
* @tags: [
* uses_transactions,
* uses_prepare_transaction,
* ]
*/
load('jstests/noPassthrough/libs/index_build.js');
load("jstests/replsets/rslib.js");
load("jstests/core/txns/libs/prepare_helpers.js");
load("jstests/libs/fail_point_util.js");
(function() {
"use strict";
const dbName = "test";
const collName = "coll";
const rst = new ReplSetTest({nodes: 1});
rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const primaryDB = primary.getDB(dbName);
const primaryColl = primaryDB[collName];
jsTestLog("Do a document write");
assert.commandWorked(primaryColl.insert({_id: 1, x: 1}, {"writeConcern": {"w": 1}}));
// Clear the log.
assert.commandWorked(primary.adminCommand({clearLog: 'global'}));
// Enable fail point which makes the index build to hang before taking a MODE_S lock to block
// writes.
const failPoint = "hangAfterIndexBuildDumpsInsertsFromBulk";
let res =
assert.commandWorked(primary.adminCommand({configureFailPoint: failPoint, mode: "alwaysOn"}));
let timesEntered = res.count;
const indexThread = IndexBuildTest.startIndexBuild(
primary, primaryColl.getFullName(), {x: 1}, {}, ErrorCodes.InterruptedDueToReplStateChange);
jsTestLog("Waiting for index build to hit failpoint");
assert.commandWorked(primary.adminCommand({
waitForFailPoint: failPoint,
timesEntered: timesEntered + 1,
maxTimeMS: kDefaultWaitForFailPointTimeout
}));
jsTestLog("Start txn");
const session = primary.startSession();
const sessionDB = session.getDatabase(dbName);
const sessionColl = sessionDB.getCollection(collName);
session.startTransaction();
assert.commandWorked(sessionColl.insert({x: 1}, {$set: {y: 1}}));
jsTestLog("Prepare txn");
PrepareHelpers.prepareTransaction(session);
// Unblock the index build, which will cause it to hang acquiring the collection S lock.
assert.commandWorked(primary.adminCommand({configureFailPoint: failPoint, mode: "off"}));
const stepDownThread = startParallelShell(() => {
jsTestLog("Make primary step down");
assert.commandWorked(db.adminCommand({"replSetStepDown": 60 * 60, "force": true}));
}, primary.port);
jsTestLog("Waiting for stepdown to complete");
indexThread();
stepDownThread();
waitForState(primary, ReplSetTest.State.SECONDARY);
// Allow the primary to be re-elected, and wait for it.
assert.commandWorked(primary.adminCommand({replSetFreeze: 0}));
rst.getPrimary();
jsTestLog("Aborting transaction and waiting for index build to finish");
assert.commandWorked(session.abortTransaction_forTesting());
IndexBuildTest.waitForIndexBuildToStop(primaryDB, primaryColl.getFullName(), "x_1");
IndexBuildTest.assertIndexes(primaryColl, 2, ["_id_", "x_1"], []);
rst.stopSet();
})();
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