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/**
* Tests that the logical session cache reaper would only reap the config.transactions and
* config.image_collection entries for a transaction session if the logical session that it
* corresponds to has expired and been removed from the config.system.sessions collection.
*
* @tags: [requires_fcv_60, uses_transactions]
*/
(function() {
"use strict";
load("jstests/sharding/libs/sharded_transactions_helpers.js");
// This test runs the reapLogicalSessionCacheNow command. That can lead to direct writes to the
// config.transactions collection, which cannot be performed on a session.
TestData.disableImplicitSessions = true;
const rst = new ReplSetTest({
nodes: 2,
nodeOptions: {
setParameter: {
maxSessions: 1,
// Force batch size 1 on secondaries.
replBatchLimitOperations: 1,
// Make transaction records expire immediately.
TransactionRecordMinimumLifetimeMinutes: 0,
storeFindAndModifyImagesInSideCollection: true,
internalSessionsReapThreshold: 0
}
}
});
rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const kConfigSessionsNs = "config.system.sessions";
const kConfigTxnsNs = "config.transactions";
const kImageCollNs = "config.image_collection";
const kOplogCollNs = "local.oplog.rs";
const sessionsColl = primary.getCollection(kConfigSessionsNs);
const transactionsColl = primary.getCollection(kConfigTxnsNs);
const imageColl = primary.getCollection(kImageCollNs);
const oplogColl = primary.getCollection(kOplogCollNs);
const dbName = "testDb";
const collName = "testColl";
const testDB = primary.getDB(dbName);
const testColl = testDB.getCollection(collName);
assert.commandWorked(testDB.runCommand({
insert: collName,
documents: [{_id: 0}, {_id: 1}],
}));
const sessionUUID = UUID();
const parentLsid = {
id: sessionUUID
};
const parentLsidFilter = makeLsidFilter(parentLsid, "_id");
let parentTxnNumber = 0;
const childTxnNumber = NumberLong(0);
let numTransactionsCollEntriesReaped = 0;
{
jsTest.log("Test reaping when there is an expired internal transaction session for a " +
"non-retryable write without an open transaction");
parentTxnNumber++;
assert.commandWorked(testDB.runCommand({
findAndModify: collName,
query: {_id: 0},
update: {$set: {x: 0}},
lsid: parentLsid,
txnNumber: NumberLong(parentTxnNumber),
}));
assert.commandWorked(primary.adminCommand({refreshLogicalSessionCacheNow: 1}));
assert.eq(1, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(1, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(1, imageColl.find(parentLsidFilter).itcount());
const childLsid = {id: sessionUUID, txnUUID: UUID()};
const childLsidFilter = makeLsidFilter(childLsid, "_id");
assert.commandWorked(testDB.runCommand({
findAndModify: collName,
query: {_id: 0},
update: {$set: {y: 0}},
lsid: childLsid,
txnNumber: childTxnNumber,
startTransaction: true,
autocommit: false
}));
assert.commandWorked(
testDB.adminCommand(makeCommitTransactionCmdObj(childLsid, childTxnNumber)));
assert.eq({_id: 0, x: 0, y: 0}, testColl.findOne({_id: 0}));
// Verify that the config.transactions entry for the internal transaction session does not get
// reaped automatically when the transaction committed.
assert.eq(1, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(1, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(1, transactionsColl.find(childLsidFilter).itcount());
assert.eq(1, imageColl.find(parentLsidFilter).itcount());
assert.eq(0, imageColl.find(childLsidFilter).itcount());
// Force the logical session cache to reap, and verify that the config.transactions (and
// config.image_collection) entries for both transaction sessions do not get reaped because the
// config.system.sessions entry still has not been deleted.
assert.commandWorked(primary.adminCommand({reapLogicalSessionCacheNow: 1}));
assert.eq(1, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(1, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(1, transactionsColl.find(childLsidFilter).itcount());
assert.eq(1, imageColl.find(parentLsidFilter).itcount());
assert.eq(0, imageColl.find(childLsidFilter).itcount());
// Delete the config.system.sessions entry, force the logical session cache to reap again, and
// verify that the config.transactions (and config.image_collection) entries for both sessions
// do get reaped this time.
assert.commandWorked(sessionsColl.remove({}));
assert.commandWorked(primary.adminCommand({reapLogicalSessionCacheNow: 1}));
assert.eq(0, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(0, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(0, transactionsColl.find(childLsidFilter).itcount());
assert.eq(0, imageColl.find(parentLsidFilter).itcount());
assert.eq(0, imageColl.find(childLsidFilter).itcount());
numTransactionsCollEntriesReaped += 2;
}
{
jsTest.log("Test reaping when there is an expired internal transaction session for a " +
"previous retryable write (i.e. with an old txnNumber)");
parentTxnNumber++;
assert.commandWorked(testDB.runCommand({
findAndModify: collName,
query: {_id: 1},
update: {$set: {x: 1}},
lsid: parentLsid,
txnNumber: NumberLong(parentTxnNumber),
}));
assert.commandWorked(primary.adminCommand({refreshLogicalSessionCacheNow: 1}));
assert.eq(1, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(1, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(1, imageColl.find(parentLsidFilter).itcount());
parentTxnNumber++;
const childLsid = {id: sessionUUID, txnNumber: NumberLong(parentTxnNumber), txnUUID: UUID()};
const childLsidFilter = makeLsidFilter(childLsid, "_id");
assert.commandWorked(testDB.runCommand({
findAndModify: collName,
query: {_id: 1},
update: {$set: {y: 1}},
lsid: childLsid,
txnNumber: childTxnNumber,
startTransaction: true,
autocommit: false
}));
assert.commandWorked(
testDB.adminCommand(makeCommitTransactionCmdObj(childLsid, childTxnNumber)));
assert.eq({_id: 1, x: 1, y: 1}, testColl.findOne({_id: 1}));
parentTxnNumber++;
assert.commandWorked(testDB.runCommand({
findAndModify: collName,
query: {_id: 1},
update: {$set: {y: 1}},
lsid: parentLsid,
txnNumber: NumberLong(parentTxnNumber),
startTransaction: true,
autocommit: false
}));
// Verify that the config.transactions and config.image_collection entries for the internal
// transaction session do not get reaped automatically when the new txnNumber started since
// eager reaping is not enabled.
assert.eq(1, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(1, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(1, transactionsColl.find(childLsidFilter).itcount());
assert.eq(1, imageColl.find(parentLsidFilter).itcount());
assert.eq(1, imageColl.find(childLsidFilter).itcount());
// Force the logical session cache to reap, and verify that the config.transactions and
// config.image_collection entries for both transaction sessions do not get reaped because the
// config.system.sessions entry still has not been deleted.
assert.commandWorked(primary.adminCommand({reapLogicalSessionCacheNow: 1}));
assert.eq(1, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(1, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(1, transactionsColl.find(childLsidFilter).itcount());
assert.eq(1, imageColl.find(parentLsidFilter).itcount());
assert.eq(1, imageColl.find(childLsidFilter).itcount());
assert.commandWorked(
testDB.adminCommand(makeCommitTransactionCmdObj(parentLsid, parentTxnNumber)));
assert.eq({_id: 1, x: 1, y: 1}, testColl.findOne({_id: 1}));
assert.eq(1, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(1, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(1, transactionsColl.find(childLsidFilter).itcount());
assert.eq(1, imageColl.find(parentLsidFilter).itcount());
assert.eq(1, imageColl.find(childLsidFilter).itcount());
// Force the logical session cache to reap, and verify that the config.transactions and
// config.image_collection entries for both transaction sessions do not get reaped because the
// config.system.sessions entry still has not been deleted.
assert.commandWorked(primary.adminCommand({reapLogicalSessionCacheNow: 1}));
assert.eq(1, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(1, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(1, transactionsColl.find(childLsidFilter).itcount());
assert.eq(1, imageColl.find(parentLsidFilter).itcount());
assert.eq(1, imageColl.find(childLsidFilter).itcount());
// Delete the config.system.sessions entry, force the logical session cache to reap again, and
// verify that the config.transactions and config.image_collection entries for both transaction
// sessions do get reaped this time.
assert.commandWorked(sessionsColl.remove({}));
assert.commandWorked(primary.adminCommand({reapLogicalSessionCacheNow: 1}));
assert.eq(0, sessionsColl.find({"_id.id": sessionUUID}).itcount());
assert.eq(0, transactionsColl.find(parentLsidFilter).itcount());
assert.eq(0, transactionsColl.find(childLsidFilter).itcount());
assert.eq(0, imageColl.find(parentLsidFilter).itcount());
assert.eq(0, imageColl.find(childLsidFilter).itcount());
numTransactionsCollEntriesReaped += 2;
}
// Validate that writes to config.transactions do not generate oplog entries, with the exception of
// deletions.
assert.eq(numTransactionsCollEntriesReaped, oplogColl.find({op: 'd', ns: kConfigTxnsNs}).itcount());
assert.eq(0, oplogColl.find({op: {'$ne': 'd'}, ns: kConfigTxnsNs}).itcount());
rst.stopSet();
})();
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