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/**
* Tests that majority reads can complete successfully even when the cluster time is being
* increased rapidly while ddl operations are happening.
*
* @tags: [requires_replication]
*/
(function() {
'use strict';
load("jstests/replsets/rslib.js"); // For startSetIfSupportsReadMajority.
const rst = new ReplSetTest({nodes: 1});
if (!startSetIfSupportsReadMajority(rst)) {
jsTest.log("skipping test since storage engine doesn't support committed reads");
rst.stopSet();
return;
}
rst.initiate();
const primary = rst.getPrimary();
const syncName = 'sync';
const syncColl = primary.getDB(syncName).getCollection(syncName);
assert.commandWorked(syncColl.insert({t: 'before'}));
function bumpClusterTime() {
jsTestLog('Beginning to bump the logical clock.');
const syncName = 'sync';
const syncColl = db.getSiblingDB(syncName).getCollection(syncName);
assert.eq(syncColl.find().itcount(), 1);
assert.commandWorked(syncColl.insert({t: 'during'}));
assert.eq(syncColl.find().itcount(), 2);
let clusterTime = new Timestamp(1, 1);
while (true) {
const higherClusterTime = new Timestamp(clusterTime.getTime() + 20, 1);
const res = assert.commandWorked(db.adminCommand({
'isMaster': 1,
'$clusterTime': {
'clusterTime': higherClusterTime,
'signature':
{'hash': BinData(0, 'AAAAAAAAAAAAAAAAAAAAAAAAAAA='), 'keyId': NumberLong(0)}
}
}));
clusterTime = res.$clusterTime.clusterTime;
if (syncColl.find().itcount() === 3) {
jsTestLog('Done bumping the logical clock.');
return;
}
}
}
const clusterTimeBumper = startParallelShell(bumpClusterTime, primary.port);
// Wait for the logical clock to begin to be bumped.
assert.soon(() => syncColl.find().itcount() === 2);
function doMajorityRead(coll, expectedCount) {
const res = assert.commandWorked(coll.runCommand('find', {
'filter': {x: 7},
'readConcern': {'level': 'majority'},
'maxTimeMS': rst.kDefaultTimeoutMS
}));
// Exhaust the cursor to avoid leaking cursors on the server.
assert.eq(expectedCount, new DBCommandCursor(coll.getDB(), res).itcount());
}
const dbName = 'minimum_visible_with_cluster_time';
const collName = 'foo';
for (let i = 0; i < 10; i++) {
const collNameI = collName + i;
jsTestLog(`Testing ${dbName}.${collNameI}`);
assert.commandWorked(primary.getDB(dbName).createCollection(collNameI));
let coll = primary.getDB(dbName).getCollection(collNameI);
doMajorityRead(coll, 0);
assert.commandWorked(coll.insert({x: 7, y: 1}));
assert.commandWorked(
coll.createIndex({x: 1}, {'name': 'x_1', 'expireAfterSeconds': 60 * 60 * 23}));
doMajorityRead(coll, 1);
assert.commandWorked(coll.insert({x: 7, y: 2}));
assert.commandWorked(coll.runCommand(
'collMod', {'index': {'keyPattern': {x: 1}, 'expireAfterSeconds': 60 * 60 * 24}}));
doMajorityRead(coll, 2);
assert.commandWorked(coll.insert({x: 7, y: 3}));
assert.commandWorked(coll.dropIndexes());
doMajorityRead(coll, 3);
assert.commandWorked(coll.insert({x: 7, y: 4}));
const newCollNameI = collNameI + '_new';
assert.commandWorked(coll.renameCollection(newCollNameI));
coll = primary.getDB(dbName).getCollection(newCollNameI);
doMajorityRead(coll, 4);
}
jsTestLog('Waiting for logical clock thread to stop.');
assert.commandWorked(syncColl.insert({t: 'after'}));
clusterTimeBumper();
rst.stopSet();
})();
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