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/**
* When the oplog size grows during recovery to exceed the configured maximum, the node must
* truncate the oplog only up to the oldest active transaction timestamp at the time of the last
* stable checkpoint. The first oplog entry that belongs to an active transaction is preserved, and
* all entries after it.
*
* This tests the oldestActiveTransactionTimestamp, which is calculated from the "startOpTime"
* field of documents in the config.transactions collection.
*
* @tags: [requires_persistence, uses_transactions, uses_prepare_transaction]
*/
(function() {
"use strict";
load("jstests/core/txns/libs/prepare_helpers.js");
load("jstests/libs/storage_helpers.js"); // getOldestRequiredTimestampForCrashRecovery()
// A new replica set for both the commit and abort tests to ensure the same clean state.
function doTest(commitOrAbort) {
const replSet = new ReplSetTest({
// Oplog can be truncated each "sync" cycle. Increase its frequency to once per second.
nodeOptions: {syncdelay: 1, setParameter: {logComponentVerbosity: tojson({storage: 1})}},
nodes: [{}, {rsConfig: {priority: 0, votes: 0}}]
});
replSet.startSet(PrepareHelpers.replSetStartSetOptions);
replSet.initiate();
const primary = replSet.getPrimary();
const primaryOplog = primary.getDB("local").oplog.rs;
assert.lte(primaryOplog.dataSize(), PrepareHelpers.oplogSizeBytes);
const coll = primary.getDB("test").test;
assert.commandWorked(coll.insert({}, {writeConcern: {w: "majority"}}));
jsTestLog("Prepare a transaction");
const session = primary.startSession();
session.startTransaction();
assert.commandWorked(session.getDatabase("test").test.insert({myTransaction: 1}));
const prepareTimestamp = PrepareHelpers.prepareTransaction(session);
const oldestRequiredTimestampForCrashRecovery =
getOldestRequiredTimestampForCrashRecovery(primary.getDB("test"));
assert.lte(oldestRequiredTimestampForCrashRecovery, prepareTimestamp);
jsTestLog("Insert documents until oplog exceeds oplogSize");
// Oplog with prepared txn grows indefinitely - let it reach twice its supposed max size.
PrepareHelpers.growOplogPastMaxSize(replSet);
// Oplog grew past maxSize, and it includes the oldest active transaction's entry.
var secondary = replSet.getSecondary();
function checkSecondaryOplog() {
const secondaryOplog = secondary.getDB("local").oplog.rs;
assert.soon(() => {
return secondaryOplog.dataSize() >= PrepareHelpers.oplogSizeBytes;
}, "waiting for secondary oplog to grow", ReplSetTest.kDefaultTimeoutMS);
const secondaryOplogEntry = PrepareHelpers.findPrepareEntry(secondaryOplog);
assert.eq(secondaryOplogEntry.ts, prepareTimestamp, tojson(secondaryOplogEntry));
}
checkSecondaryOplog();
jsTestLog("Restart the secondary");
const secondaryId = replSet.getSecondary().nodeId;
// Validation can't complete while the active transaction holds a lock.
replSet.stop(secondaryId, undefined, {skipValidation: true});
secondary = replSet.start(secondaryId, {}, true /* restart */);
jsTestLog("Restarted");
replSet.awaitSecondaryNodes();
checkSecondaryOplog();
if (commitOrAbort === "commit") {
jsTestLog("Commit prepared transaction and wait for oplog to shrink to max oplogSize");
PrepareHelpers.commitTransaction(session, prepareTimestamp);
} else if (commitOrAbort === "abort") {
jsTestLog("Abort prepared transaction and wait for oplog to shrink to max oplogSize");
assert.commandWorked(session.abortTransaction_forTesting());
} else {
throw new Error(`Unrecognized value for commitOrAbort: ${commitOrAbort}`);
}
PrepareHelpers.awaitOplogTruncation(replSet);
// ReplSetTest reacts poorly to restarting a node, end it manually.
replSet.stopSet(true, false, {});
}
doTest("commit");
doTest("abort");
})();
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