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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";
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 waitForOp(curOpFilter) {
assert.soon(
function() {
const res = adminDB.aggregate([{$currentOp: {}}, {$match: curOpFilter}]).toArray();
if (res.length === 1) {
return true;
}
return false;
},
function() {
return "Failed to find operation in $currentOp output: " +
tojson(adminDB.aggregate([{$currentOp: {}}]).toArray());
});
}
function testCommand(cmd, curOpFilter) {
coll.drop({writeConcern: {w: "majority"}});
assert.commandWorked(testDB.runCommand({
createIndexes: kCollName,
indexes:
[{key: {haystack: "geoHaystack", a: 1}, name: "haystack_geo", bucketSize: 1}]
}));
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"}));
const awaitCommand = 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);" +
"assert.eq(res.errorLabels, ['TransientTransactionError']);" +
"session.endSession();",
rst.ports[0]);
waitForOp(curOpFilter);
// Create an index on the collection the command was executed against. This will move the
// collection's minimum visible timestamp to a point later than the point-in-time referenced
// by the transaction snapshot.
assert.commandWorked(testDB.runCommand({
createIndexes: kCollName,
indexes: [{key: {x: 1}, name: "x_1"}],
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"});
testCommand({delete: kCollName, deletes: [{q: {x: 1}, limit: 1}]},
{"command.delete": kCollName, "command.readConcern.level": "snapshot"});
testCommand({distinct: kCollName, key: "x"},
{"command.distinct": kCollName, "command.readConcern.level": "snapshot"});
testCommand({find: kCollName},
{"command.find": kCollName, "command.readConcern.level": "snapshot"});
testCommand({findAndModify: kCollName, query: {x: 1}, remove: true}, {
"command.findAndModify": kCollName,
"command.remove": true,
"command.readConcern.level": "snapshot"
});
testCommand({findAndModify: kCollName, query: {x: 1}, update: {$set: {x: 2}}}, {
"command.findAndModify": kCollName,
"command.update.$set": {x: 2},
"command.readConcern.level": "snapshot"
});
testCommand({geoSearch: kCollName, near: [0, 0], maxDistance: 1, search: {a: 1}},
{"command.geoSearch": kCollName, "command.readConcern.level": "snapshot"});
testCommand({insert: kCollName, documents: [{x: 1}]},
{"command.insert": kCollName, "command.readConcern.level": "snapshot"});
testCommand({update: kCollName, updates: [{q: {x: 1}, u: {$set: {x: 2}}}]},
{"command.update": kCollName, "command.readConcern.level": "snapshot"});
rst.stopSet();
})();
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