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/*
* Tests that transaction records for retryable internal sessions are reaped eagerly when they are
* reaped early from memory.
*
* @tags: [requires_fcv_60, uses_transactions]
*/
(function() {
"use strict";
const st = new ShardingTest({shards: 1, config: 1});
const kDbName = "testDb";
const kCollName = "testColl";
const mongosTestColl = st.s.getCollection(kDbName + "." + kCollName);
assert.commandWorked(mongosTestColl.insert({x: 1})); // Set up the collection.
function assertNumEntries(conn,
{sessionUUID, numImageCollectionEntries, numTransactionsCollEntries}) {
const filter = {"_id.id": sessionUUID};
const imageColl = conn.getCollection("config.image_collection");
assert.eq(numImageCollectionEntries,
imageColl.find(filter).itcount(),
tojson(imageColl.find().toArray()));
const transactionsColl = conn.getCollection("config.transactions");
assert.eq(numTransactionsCollEntries,
transactionsColl.find(filter).itcount(),
tojson(transactionsColl.find().toArray()));
}
function runInternalTxn(conn, lsid, txnNumber) {
const testInternalTxnCmdObj = {
testInternalTransactions: 1,
commandInfos: [{
dbName: kDbName,
command: {
// Use findAndModify to generate image collection entries.
findAndModify: kCollName,
query: {x: 1},
update: {$inc: {counter: 1}},
stmtId: NumberInt(3),
}
}],
lsid: lsid,
};
if (txnNumber !== undefined) {
testInternalTxnCmdObj.txnNumber = NumberLong(txnNumber);
}
assert.commandWorked(conn.adminCommand(testInternalTxnCmdObj));
}
function assertNumEntriesSoon(
shardConn, {sessionUUID, numImageCollectionEntries, numTransactionsCollEntries}) {
// Sleep a little so it's likely the reaping has finished and we can avoid spamming the logs.
sleep(100);
assert.soonNoExcept(() => {
assertNumEntries(shardConn,
{sessionUUID, numImageCollectionEntries, numTransactionsCollEntries});
return true;
}, "Expected internal transactions to be reaped eventually", undefined, 100 /* interval */);
}
function runTest(conn, shardConn) {
// Lower the threshold to speed up the test and verify it's respected.
const reapThreshold = 100;
assert.commandWorked(
shardConn.adminCommand({setParameter: 1, internalSessionsReapThreshold: reapThreshold}));
//
// Reaping happens at the threshold.
//
let parentLsid = {id: UUID()};
// No transaction records at first.
assertNumEntries(
shardConn,
{sessionUUID: parentLsid.id, numImageCollectionEntries: 0, numTransactionsCollEntries: 0});
// Records build up until the reap threshold.
for (let i = 0; i < reapThreshold; i++) {
runInternalTxn(conn, parentLsid, i);
}
assertNumEntries(shardConn, {
sessionUUID: parentLsid.id,
numImageCollectionEntries: reapThreshold,
numTransactionsCollEntries: reapThreshold
});
// Push the number of eagerly reaped sessions up to the threshold and verify this triggers
// reaping them.
runInternalTxn(conn, parentLsid, reapThreshold + 1);
assertNumEntriesSoon(
shardConn,
{sessionUUID: parentLsid.id, numImageCollectionEntries: 1, numTransactionsCollEntries: 1});
//
// Reaping can run more than once.
//
for (let i = 0; i < reapThreshold; i++) {
// We're on the same session as before, so pick higher txnNumbers than used before.
const txnNumber = i + reapThreshold + 1;
runInternalTxn(conn, parentLsid, txnNumber);
}
assertNumEntriesSoon(
shardConn,
{sessionUUID: parentLsid.id, numImageCollectionEntries: 1, numTransactionsCollEntries: 1});
//
// Buffered sessions are cleared on failover.
//
parentLsid = {id: UUID()};
const numBeforeFailover = (reapThreshold / 2) + 1;
for (let i = 0; i < numBeforeFailover; i++) {
runInternalTxn(conn, parentLsid, i);
}
assertNumEntries(shardConn, {
sessionUUID: parentLsid.id,
numImageCollectionEntries: numBeforeFailover,
numTransactionsCollEntries: numBeforeFailover
});
// Step down and back up the new primary and verify it only reaps newly expired internal
// sessions.
assert.commandWorked(
shardConn.adminCommand({replSetStepDown: ReplSetTest.kForeverSecs, force: true}));
assert.commandWorked(shardConn.adminCommand({replSetFreeze: 0}));
st.rs0.stepUp(shardConn);
shardConn = st.rs0.getPrimary();
const numAfterFailover = (reapThreshold / 2) + 1;
assert(numAfterFailover + numBeforeFailover > reapThreshold);
for (let i = 0; i < numAfterFailover; i++) {
const txnNumber = i + numBeforeFailover; // Account for txnNumbers used before failover.
runInternalTxn(conn, parentLsid, txnNumber);
}
assertNumEntries(shardConn, {
sessionUUID: parentLsid.id,
numImageCollectionEntries: numBeforeFailover + numAfterFailover,
numTransactionsCollEntries: numBeforeFailover + numAfterFailover
});
// Insert up to the threshold and verify a reap is triggered.
for (let i = 0; i < reapThreshold - numAfterFailover; i++) {
const txnNumber = i + 1000; // Account for txnNumbers used earlier.
runInternalTxn(conn, parentLsid, txnNumber);
}
assertNumEntriesSoon(shardConn, {
sessionUUID: parentLsid.id,
numImageCollectionEntries: numBeforeFailover,
numTransactionsCollEntries: numBeforeFailover
});
//
// Reaping ignores non-retryable sessions and parent sessions.
//
parentLsid = {id: UUID()};
runInternalTxn(conn, parentLsid); // Non-retryable transaction.
assert.commandWorked(conn.getDB("test").runCommand({
insert: "foo",
documents: [{x: 1}],
lsid: parentLsid,
txnNumber: NumberLong(0),
stmtId: NumberInt(0)
}));
// Run enough retryable transactions to trigger a reap.
for (let i = 0; i < reapThreshold + 1; i++) {
const txnNumber = i + 1; // Account for the retryable write's txnNumber.
runInternalTxn(conn, parentLsid, txnNumber);
}
// Expect 3: the parent entry, the non-retryable entry, and the latest retryable child. Only the
// retryable child has an image entry, so just expect 1 of those.
assertNumEntriesSoon(
shardConn,
{sessionUUID: parentLsid.id, numImageCollectionEntries: 1, numTransactionsCollEntries: 3});
}
// Validates behavior about the configurable reap threshold server parameter.
function runParameterTest(conn, shardConn) {
// Must be a number.
assert.commandFailedWithCode(
shardConn.adminCommand({setParameter: 1, internalSessionsReapThreshold: "wontwork"}),
ErrorCodes.BadValue);
// Can't be set negative.
assert.commandFailedWithCode(
shardConn.adminCommand({setParameter: 1, internalSessionsReapThreshold: -1}),
ErrorCodes.BadValue);
// Can be set to 0 or a positive value.
assert.commandWorked(
shardConn.adminCommand({setParameter: 1, internalSessionsReapThreshold: 0}));
assert.commandWorked(
shardConn.adminCommand({setParameter: 1, internalSessionsReapThreshold: 12345}));
// Doesn't exist on mongos. This fails with no error code so check the errmsg.
const res = assert.commandFailed(
conn.adminCommand({setParameter: 1, internalSessionsReapThreshold: 222}));
assert(res.errmsg.includes("unrecognized parameter"), tojson(res));
}
runTest(st.s, st.rs0.getPrimary());
runParameterTest(st.s, st.rs0.getPrimary());
st.stop();
})();
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