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// Tests that snapshot reads return an error when accessing a collection whose metadata is invalid
// for the snapshot's point in time.
// @tags: [uses_transactions]
(function() {
"use strict";
load("jstests/libs/curop_helpers.js"); // For waitForCurOpByFailPoint().
load("jstests/libs/feature_flag_util.js"); // For FeatureFlagUtil.isEnabled().
const kDbName = "test";
const kCollName = "coll";
const rst = new ReplSetTest({nodes: 1});
rst.startSet();
rst.initiate();
const testDB = rst.getPrimary().getDB(kDbName);
const adminDB = testDB.getSiblingDB("admin");
const coll = testDB.getCollection(kCollName);
function execCommand(cmd, expectSucceed) {
if (expectSucceed) {
return startParallelShell(
"const session = db.getMongo().startSession();" +
"const sessionDb = session.getDatabase('test');" +
"session.startTransaction({readConcern: {level: 'snapshot'}});" +
"const res = sessionDb.runCommand(" + tojson(cmd) + ");" +
"assert.commandWorked(res);" +
"session.endSession();",
rst.ports[0]);
} else {
return startParallelShell(
"const session = db.getMongo().startSession();" +
"const sessionDb = session.getDatabase('test');" +
"session.startTransaction({readConcern: {level: 'snapshot'}});" +
"const res = sessionDb.runCommand(" + tojson(cmd) + ");" +
"assert.commandFailedWithCode(res, [ErrorCodes.SnapshotUnavailable, ErrorCodes.WriteConflict]);" +
"assert.eq(res.errorLabels, ['TransientTransactionError']);" +
"session.endSession();",
rst.ports[0]);
}
}
function testCommand(cmd, curOpFilter, expectSucceed) {
coll.drop({writeConcern: {w: "majority"}});
assert.commandWorked(coll.insert({x: 1}, {writeConcern: {w: "majority"}}));
// Start a command with readConcern "snapshot" that hangs after establishing a storage
// engine transaction.
assert.commandWorked(testDB.adminCommand(
{configureFailPoint: "hangAfterPreallocateSnapshot", mode: "alwaysOn"}));
// Execute command in parallel shell. Read commands should work even if catalog changes has
// occured since opening the snapshot.
const awaitCommand = execCommand(cmd, expectSucceed);
waitForCurOpByFailPointNoNS(testDB, "hangAfterPreallocateSnapshot", curOpFilter);
// Rename the collection the command was executed against and then back to its original name.
// This will move the collection's minimum visible timestamp to a point later than the
// point-in-time referenced by the transaction snapshot.
const tempColl = testDB.getName() + '.temp';
assert.commandWorked(testDB.adminCommand({
renameCollection: testDB.getName() + '.' + kCollName,
to: tempColl,
writeConcern: {w: "majority"},
}));
assert.commandWorked(testDB.adminCommand({
renameCollection: tempColl,
to: testDB.getName() + '.' + kCollName,
writeConcern: {w: "majority"},
}));
// Disable the hang and check for parallel shell success. Success indicates that the command
// failed due to collection metadata invalidation.
assert.commandWorked(
testDB.adminCommand({configureFailPoint: "hangAfterPreallocateSnapshot", mode: "off"}));
awaitCommand();
}
testCommand({aggregate: kCollName, pipeline: [], cursor: {}},
{"command.aggregate": kCollName, "command.readConcern.level": "snapshot"},
true /*read is expected to succeed*/);
testCommand({delete: kCollName, deletes: [{q: {x: 1}, limit: 1}]},
{"command.delete": kCollName, "command.readConcern.level": "snapshot"},
false /*write is expected to fail*/);
testCommand({distinct: kCollName, key: "x"},
{"command.distinct": kCollName, "command.readConcern.level": "snapshot"},
true /*read is expected to succeed*/);
testCommand({find: kCollName},
{"command.find": kCollName, "command.readConcern.level": "snapshot"},
true /*read is expected to succeed*/);
testCommand({findAndModify: kCollName, query: {x: 1}, remove: true},
{
"command.findAndModify": kCollName,
"command.remove": true,
"command.readConcern.level": "snapshot"
},
false /*write is expected to fail*/);
testCommand({findAndModify: kCollName, query: {x: 1}, update: {$set: {x: 2}}},
{
"command.findAndModify": kCollName,
"command.update.$set": {x: 2},
"command.readConcern.level": "snapshot"
},
false /*write is expected to fail*/);
testCommand({insert: kCollName, documents: [{x: 1}]},
{"command.insert": kCollName, "command.readConcern.level": "snapshot"},
false /*write is expected to fail*/);
testCommand({update: kCollName, updates: [{q: {x: 1}, u: {$set: {x: 2}}}]},
{"command.update": kCollName, "command.readConcern.level": "snapshot"},
false /*write is expected to fail*/);
rst.stopSet();
})();
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