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'use strict';
/**
* Perform point-in-time snapshot reads that span a 'find' and multiple 'getmore's concurrently with
* CRUD operations. Index operations running concurrently with the snapshot read may cause
* the read to fail with a SnapshotUnavailable error.
*
* @tags: [creates_background_indexes, requires_fcv_46, requires_replication,
* does_not_support_causal_consistency, requires_majority_read_concern]
*/
load('jstests/concurrency/fsm_workload_helpers/snapshot_read_utils.js');
var $config = (function() {
const data = {numIds: 100, numDocsToInsertPerThread: 5, batchSize: 10};
const states = {
snapshotScan: function snapshotScan(db, collName) {
const readErrorCodes = [
ErrorCodes.SnapshotUnavailable,
ErrorCodes.ShutdownInProgress,
ErrorCodes.CursorNotFound,
ErrorCodes.QueryPlanKilled,
];
if (!this.cursorId || this.cursorId == 0) {
doSnapshotFindAtClusterTime(db, collName, this, readErrorCodes, {a: 1});
} else {
doSnapshotGetMoreAtClusterTime(db, collName, this, readErrorCodes);
}
},
insertDocs: function insertDocs(db, collName) {
for (let i = 0; i < this.numDocsToInsertPerThread; ++i) {
const res = db[collName].insert({x: 1});
assertWhenOwnColl.commandWorked(res);
assertWhenOwnColl.eq(1, res.nInserted);
}
},
updateDocs: function updateDocs(db, collName) {
for (let i = 0; i < this.numIds; ++i) {
try {
db[collName].update({a: i}, {$inc: {x: 1}});
} catch (e) {
// dropIndex can cause queries to throw if these queries yield.
assertAlways.contains(e.code,
[ErrorCodes.QueryPlanKilled, ErrorCodes.OperationFailed],
'unexpected error code: ' + e.code + ': ' + e.message);
}
}
},
readDocs: function readDocs(db, collName) {
for (let i = 0; i < this.numIds; ++i) {
try {
db[collName].findOne({a: i});
} catch (e) {
// dropIndex can cause queries to throw if these queries yield.
assertAlways.contains(e.code,
[ErrorCodes.QueryPlanKilled, ErrorCodes.OperationFailed],
'unexpected error code: ' + e.code + ': ' + e.message);
}
}
},
deleteDocs: function deleteDocs(db, collName) {
let indexToDelete = Math.floor(Math.random() * this.numIds);
try {
db[collName].deleteOne({a: indexToDelete});
} catch (e) {
// dropIndex can cause queries to throw if these queries yield.
assertAlways.contains(e.code,
[ErrorCodes.QueryPlanKilled, ErrorCodes.OperationFailed],
'unexpected error code: ' + e.code + ': ' + e.message);
}
},
createIndex: function createIndex(db, collName) {
db[collName].createIndex({a: 1}, {background: true});
},
dropIndex: function dropIndex(db, collName) {
db[collName].dropIndex({a: 1});
},
};
const transitions = {
snapshotScan: {
insertDocs: 0.17,
updateDocs: 0.16,
deleteDocs: 0.17,
readDocs: 0.16,
createIndex: 0.17,
dropIndex: 0.17,
},
insertDocs: {snapshotScan: 1.0},
updateDocs: {snapshotScan: 1.0},
readDocs: {snapshotScan: 1.0},
deleteDocs: {snapshotScan: 1.0},
createIndex: {snapshotScan: 1.0},
dropIndex: {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) => ({a: i, x: 1}));
assert.commandWorked(db.runCommand({insert: collName, documents: docs}));
assert.commandWorked(
db.runCommand({createIndexes: collName, indexes: [{key: {a: 1}, name: "a_1"}]}));
}
function teardown(db, collName, cluster) {
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: 'snapshotScan',
states: states,
transitions: transitions,
setup: setup,
teardown: teardown,
data: data,
};
})();
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