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'use strict';
/**
* Perform point-in-time snapshot reads that span a 'find' and multiple 'getmore's concurrently with
* CRUD operations, after initial insert operations. This tests that the effects of concurrent CRUD
* operations are not visible to the point-in-time snapshot reads. The initial inserted documents
* (prior to the atClusterTime timestamp) are of the pattern:
* {_id: (0-99), x:1}. The subsequent inserted documents have a generated ObjectId as _id. Document
* updates increment the value of x. We test that the snapshot read only returns documents where _id
* is between 0-99, and the value of x is always 1.
*
* @tags: [
* does_not_support_causal_consistency,
* requires_majority_read_concern,
* requires_replication,
* ]
*/
load('jstests/concurrency/fsm_workload_helpers/snapshot_read_utils.js');
var $config = (function() {
const data = {numIds: 100, numDocsToInsertPerThread: 5, batchSize: 10};
const states = {
init: function init(db, collName) {
this.atClusterTime = new Timestamp(this.clusterTime.t, this.clusterTime.i);
jsTestLog("atClusterTime Timestamp: " + this.atClusterTime.toString());
this.numDocScanned = 0;
},
snapshotScan: function snapshotScan(db, collName) {
if (!this.cursorId || this.cursorId == 0) {
doSnapshotFindAtClusterTime(
db, collName, this, [ErrorCodes.ShutdownInProgress], {_id: 1}, (res) => {
let expectedDocs =
[...Array(this.batchSize).keys()].map((i) => ({_id: i, x: 1}));
assert.eq(res.cursor.firstBatch, expectedDocs, () => tojson(res));
this.numDocScanned = this.batchSize;
});
} else {
// The killOp() function below may cause Interrupted or CursorNotFound here, or the
// end of the test may cause ShutdownInProgress.
doSnapshotGetMoreAtClusterTime(
db,
collName,
this,
[
ErrorCodes.Interrupted,
ErrorCodes.CursorNotFound,
ErrorCodes.ShutdownInProgress
],
(res) => {
let expectedDocs = [...Array(this.batchSize).keys()].map(
(i) => ({_id: i + this.numDocScanned, x: 1}));
assert.eq(res.cursor.nextBatch, expectedDocs, () => tojson(res));
this.numDocScanned = this.numDocScanned + this.batchSize;
});
}
},
insertDocs: function insertDocs(db, collName) {
for (let i = 0; i < this.numDocsToInsertPerThread; ++i) {
const res = db[collName].insert({x: 1});
assertWhenOwnColl.commandWorked(res);
assertWhenOwnColl.eq(1, res.nInserted);
}
},
updateDocs: function updateDocs(db, collName) {
for (let i = 0; i < this.numIds; ++i) {
assert.commandWorked(db[collName].update({_id: i}, {$inc: {x: 1}}));
}
},
readDocs: function readDocs(db, collName) {
for (let i = 0; i < this.numIds; ++i) {
db[collName].findOne({_id: i});
}
},
deleteDocs: function deleteDocs(db, collName) {
let indexToDelete = Math.floor(Math.random() * this.numIds);
assert.commandWorked(db[collName].deleteOne({_id: indexToDelete}));
},
killOp: function killOp(db, collName) {
// Find the object ID of the getMore in the snapshot read, if it is running, and attempt
// to kill the operation.
const res = assert.commandWorkedOrFailedWithCode(
db.adminCommand(
{currentOp: 1, ns: {$regex: db.getName() + "\." + collName}, op: "getmore"}),
[ErrorCodes.Interrupted]);
if (res.hasOwnProperty("inprog") && res.inprog.length) {
const killOpCmd = {killOp: 1, op: res.inprog[0].opid};
const killRes = db.adminCommand(killOpCmd);
assert.commandWorkedOrFailedWithCode(killRes, ErrorCodes.Interrupted);
}
},
};
const transitions = {
init: {
snapshotScan: 0.2,
insertDocs: 0.2,
updateDocs: 0.2,
deleteDocs: 0.2,
readDocs: 0.2,
},
snapshotScan:
{insertDocs: 0.2, updateDocs: 0.2, deleteDocs: 0.2, readDocs: 0.2, killOp: 0.2},
insertDocs: {snapshotScan: 1.0},
updateDocs: {snapshotScan: 1.0},
readDocs: {snapshotScan: 1.0},
deleteDocs: {snapshotScan: 1.0},
killOp: {snapshotScan: 1.0}
};
let minSnapshotHistoryWindowInSecondsDefault;
function setup(db, collName, cluster) {
// We temporarily increase the minimum snapshot history window to ensure point-in-time reads
// at the initial insert timestamp are valid throughout the duration of this test.
cluster.executeOnMongodNodes((db) => {
const res = db.adminCommand({setParameter: 1, minSnapshotHistoryWindowInSeconds: 3600});
assert.commandWorked(res);
minSnapshotHistoryWindowInSecondsDefault = res.was;
});
// We modify chunk history to be larger on config nodes to ensure snapshot reads succeed for
// sharded clusters.
if (cluster.isSharded()) {
cluster.executeOnConfigNodes((db) => {
assert.commandWorked(
db.adminCommand({setParameter: 1, minSnapshotHistoryWindowInSeconds: 3600}));
});
}
assertWhenOwnColl.commandWorked(db.runCommand({create: collName}));
const docs = [...Array(this.numIds).keys()].map((i) => ({_id: i, x: 1}));
this.clusterTime =
assert.commandWorked(db.runCommand({insert: collName, documents: docs})).operationTime;
}
function teardown(db, collName, cluster) {
assertWhenOwnColl.commandWorked(db.runCommand({drop: collName}));
cluster.executeOnMongodNodes(function(db) {
assert.commandWorked(db.adminCommand({
setParameter: 1,
minSnapshotHistoryWindowInSeconds: minSnapshotHistoryWindowInSecondsDefault
}));
});
if (cluster.isSharded()) {
cluster.executeOnConfigNodes((db) => {
assert.commandWorked(db.adminCommand({
setParameter: 1,
minSnapshotHistoryWindowInSeconds: minSnapshotHistoryWindowInSecondsDefault
}));
});
}
}
return {
threadCount: 5,
iterations: 50,
startState: 'init',
states: states,
transitions: transitions,
setup: setup,
teardown: teardown,
data: data,
};
})();
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