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// Test that the read concern level 'snapshot' exhibits the correct yielding behavior. That is,
// operations performed at read concern level snapshot check for interrupt but do not yield locks or
// storage engine resources.
(function() {
"use strict";
load("jstests/libs/profiler.js"); // For getLatestProfilerEntry.
const dbName = "test";
const collName = "coll";
const rst = new ReplSetTest({nodes: 1});
rst.startSet();
rst.initiate();
const db = rst.getPrimary().getDB(dbName);
const adminDB = db.getSiblingDB("admin");
const coll = db.coll;
TestData.numDocs = 4;
if (!db.serverStatus().storageEngine.supportsSnapshotReadConcern) {
rst.stopSet();
return;
}
TestData.sessionId = assert.commandWorked(adminDB.runCommand({startSession: 1})).id;
TestData.txnNumber = 0;
// Set 'internalQueryExecYieldIterations' to 2 to ensure that commands yield on the second try
// (i.e. after they have established a snapshot but before they have returned any documents).
assert.commandWorked(db.adminCommand({setParameter: 1, internalQueryExecYieldIterations: 2}));
db.setProfilingLevel(2);
function waitForOpId(curOpFilter) {
let opId;
assert.soon(
function() {
const res = adminDB
.aggregate([
{$currentOp: {}},
{$match: {$and: [{ns: coll.getFullName()}, curOpFilter]}}
])
.toArray();
if (res.length === 1) {
opId = res[0].opid;
return true;
}
return false;
},
function() {
return "Failed to find operation in $currentOp output: " +
tojson(adminDB.aggregate([{$currentOp: {}}, {$match: {ns: coll.getFullName()}}])
.toArray());
});
return opId;
}
function assertKillPending(opId) {
const res =
adminDB.aggregate([{$currentOp: {}}, {$match: {ns: coll.getFullName(), opid: opId}}])
.toArray();
assert.eq(res.length,
1,
tojson(adminDB.aggregate([{$currentOp: {}}, {$match: {ns: coll.getFullName()}}])
.toArray()));
assert(res[0].hasOwnProperty("killPending"), tojson(res));
assert.eq(true, res[0].killPending, tojson(res));
}
function populateCollection() {
db.coll.drop();
for (let i = 0; i < TestData.numDocs; i++) {
assert.commandWorked(db.coll.insert({_id: i, x: 1}, {writeConcern: {w: "majority"}}));
}
}
function testCommand(awaitCommandFn, curOpFilter, profilerFilter, testWriteConflict) {
//
// Test that the command can be killed.
//
TestData.txnNumber++;
populateCollection();
// Start a command that hangs before checking for interrupt.
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "alwaysOn"}));
let awaitCommand = startParallelShell(awaitCommandFn, rst.ports[0]);
// Kill the command, and check that it is set to killPending.
let opId = waitForOpId(curOpFilter);
assert.commandWorked(db.killOp(opId));
assertKillPending(opId);
// Remove the hang, and check that the command is killed.
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "off"}));
let exitCode = awaitCommand({checkExitSuccess: false});
assert.neq(0, exitCode, "Expected shell to exit with failure due to operation kill");
//
// Test that the command does not yield locks.
//
TestData.txnNumber++;
populateCollection();
// Start a command that hangs before checking for interrupt.
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "alwaysOn"}));
awaitCommand = startParallelShell(awaitCommandFn, rst.ports[0]);
waitForOpId(curOpFilter);
// Start a drop. This should block behind the command, since the command does not yield
// locks.
let awaitDrop = startParallelShell(function() {
db.getSiblingDB("test").coll.drop();
}, rst.ports[0]);
// Remove the hang. The command should complete successfully.
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "off"}));
awaitCommand();
// Now the drop can complete.
awaitDrop();
// Confirm that the command did not yield.
if (profilerFilter) {
let profilerEntry = getLatestProfilerEntry(db, profilerFilter);
assert(profilerEntry.hasOwnProperty("numYield"), tojson(profilerEntry));
assert.eq(0, profilerEntry.numYield, tojson(profilerEntry));
}
//
// Test that the command does not read data that is inserted during its execution.
// 'awaitCommandFn' should fail if it reads a document {_id: <numDocs>, x: 1, new: 1}.
//
TestData.txnNumber++;
populateCollection();
// Start a command that hangs before checking for interrupt.
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "alwaysOn"}));
awaitCommand = startParallelShell(awaitCommandFn, rst.ports[0]);
waitForOpId(curOpFilter);
// Insert data that should not be read by the command.
assert.commandWorked(
db.coll.insert({_id: TestData.numDocs, x: 1, new: 1}, {writeConcern: {w: "majority"}}));
// Remove the hang. The command should complete successfully.
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "off"}));
awaitCommand();
//
// Test that the command fails if a write conflict occurs. 'awaitCommandFn' should write to
// {_id: <numDocs>, x: 1, new: 1}.
//
if (testWriteConflict) {
TestData.txnNumber++;
populateCollection();
// Insert the document that the command will write to.
assert.commandWorked(db.coll.insert({_id: TestData.numDocs, x: 1, new: 1},
{writeConcern: {w: "majority"}}));
// Start a command that hangs before checking for interrupt.
assert.commandWorked(db.adminCommand({
configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang",
mode: "alwaysOn"
}));
awaitCommand = startParallelShell(awaitCommandFn, rst.ports[0]);
waitForOpId(curOpFilter);
// Update the document that the command will write to.
assert.commandWorked(db.coll.update({_id: TestData.numDocs},
{$set: {conflict: true}},
{writeConcern: {w: "majority"}}));
// Remove the hang. The command should fail.
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "off"}));
exitCode = awaitCommand({checkExitSuccess: false});
assert.neq(0, exitCode, "Expected shell to exit with failure due to WriteConflict");
}
}
// Test find.
testCommand(function() {
const res = assert.commandWorked(db.runCommand({
find: "coll",
filter: {x: 1},
readConcern: {level: "snapshot"},
lsid: TestData.sessionId,
txnNumber: NumberLong(TestData.txnNumber)
}));
assert.eq(res.cursor.firstBatch.length, TestData.numDocs, tojson(res));
}, {"command.filter": {x: 1}}, {op: "query"});
// Test getMore.
testCommand(function() {
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "off"}));
const initialFindBatchSize = 2;
const cursorId = assert
.commandWorked(db.runCommand({
find: "coll",
filter: {x: 1},
batchSize: initialFindBatchSize,
readConcern: {level: "snapshot"},
lsid: TestData.sessionId,
txnNumber: NumberLong(TestData.txnNumber)
}))
.cursor.id;
assert.commandWorked(db.adminCommand(
{configureFailPoint: "setInterruptOnlyPlansCheckForInterruptHang", mode: "alwaysOn"}));
const res = assert.commandWorked(db.runCommand({
getMore: NumberLong(cursorId),
collection: "coll",
batchSize: TestData.numDocs,
lsid: TestData.sessionId,
txnNumber: NumberLong(TestData.txnNumber)
}));
assert.eq(
res.cursor.nextBatch.length, TestData.numDocs - initialFindBatchSize, tojson(res));
}, {"originatingCommand.filter": {x: 1}}, {op: "getmore"});
// Test update.
// We cannot profide a 'profilerFilter' because profiling is turned off for write commands in
// transactions.
testCommand(function() {
const res = assert.commandWorked(db.runCommand({
update: "coll",
updates: [{q: {new: 1}, u: {$set: {updated: true}}}],
readConcern: {level: "snapshot"},
lsid: TestData.sessionId,
txnNumber: NumberLong(TestData.txnNumber)
}));
assert.eq(res.n, 0, tojson(res));
assert.eq(res.nModified, 0, tojson(res));
}, {op: "update"}, null, true);
rst.stopSet();
}());
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