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/**
* When the oplog size grows during initial sync 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: [uses_transactions, uses_prepare_transaction]
*/
(function() {
"use strict";
load("jstests/core/txns/libs/prepare_helpers.js");
// A new replica set for both the commit and abort tests to ensure the same clean state.
function doTest(commitOrAbort) {
const replSet = new ReplSetTest({
oplogSize: PrepareHelpers.oplogSizeMB,
// Oplog can be truncated each "sync" cycle. Increase its frequency to once per second.
nodeOptions:
{syncdelay: 1, setParameter: {logComponentVerbosity: tojson({storage: 1})}},
nodes: 1
});
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 txnEntry = primary.getDB("config").transactions.findOne();
const oldestRequiredTimestampForCrashRecovery =
PrepareHelpers.getOldestRequiredTimestampForCrashRecovery(primary.getDB("test"));
assert.lte(oldestRequiredTimestampForCrashRecovery, prepareTimestamp);
// Make sure that the timestamp of the first oplog entry for this transaction matches the
// start timestamp in the transactions table.
let oplog = primary.getDB("local").getCollection("oplog.rs");
const txnNum = session.getTxnNumber_forTesting();
const op = oplog.findOne({"txnNumber": txnNum, "lsid.id": session.getSessionId().id});
assert.neq(op, null);
const firstTxnOpTs = op.ts;
assert.eq(txnEntry.startOpTime.ts, firstTxnOpTs, tojson(txnEntry));
jsTestLog("Insert documents until oplog exceeds oplogSize");
// Oplog with prepared txn grows indefinitely - let it reach twice its supposed max size.
PrepareHelpers.growOplogPastMaxSize(replSet);
jsTestLog("Make sure the transaction's first entry is still in the oplog");
assert.eq(primaryOplog.find({ts: firstTxnOpTs}).itcount(), 1);
jsTestLog("Add a secondary node");
const secondary = replSet.add({rsConfig: {votes: 0, priority: 0}});
replSet.reInitiate();
jsTestLog("Reinitiated, awaiting secondary node");
replSet.awaitSecondaryNodes();
jsTestLog("Checking secondary oplog and config.transactions");
// Oplog grew past maxSize, and it includes the oldest active transaction's entry.
const secondaryOplog = secondary.getDB("local").oplog.rs;
assert.gt(secondaryOplog.dataSize(), PrepareHelpers.oplogSizeBytes);
assert.eq(secondaryOplog.find({ts: firstTxnOpTs}).itcount(), 1);
const secondaryTxnEntry = secondary.getDB("config").transactions.findOne();
assert.eq(secondaryTxnEntry, txnEntry, tojson(secondaryTxnEntry));
if (commitOrAbort === "commit") {
jsTestLog("Commit prepared transaction and wait for oplog to shrink to max oplogSize");
assert.commandWorked(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}`);
}
replSet.awaitReplication();
PrepareHelpers.awaitOplogTruncation(replSet);
replSet.stopSet();
}
doTest("commit");
doTest("abort");
})();
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