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/**
* Tests that reads on a secondary during batch application only see changes that occur at the last
* applied timestamp, which is advanced at the completion of each batch.
*
* This test uses a failpoint to block right before batch application finishes, while holding the
* PBWM lock, and before advancing the last applied timestamp for readers.
*
*/
(function() {
"use strict";
load('jstests/replsets/libs/secondary_reads_test.js');
const name = "secondaryReadsTimestampVisibility";
const collName = "testColl";
let secondaryReadsTest = new SecondaryReadsTest(name);
let replSet = secondaryReadsTest.getReplset();
let primaryDB = secondaryReadsTest.getPrimaryDB();
let secondaryDB = secondaryReadsTest.getSecondaryDB();
if (!primaryDB.serverStatus().storageEngine.supportsSnapshotReadConcern) {
secondaryReadsTest.stop();
return;
}
let primaryColl = primaryDB.getCollection(collName);
// Create a collection and an index. Insert some data.
primaryDB.runCommand({drop: collName});
assert.commandWorked(primaryDB.runCommand({create: collName}));
assert.commandWorked(primaryDB.runCommand(
{createIndexes: collName, indexes: [{key: {y: 1}, name: "y_1", unique: true}]}));
for (let i = 0; i < 100; i++) {
assert.commandWorked(primaryColl.insert({_id: i, x: 0, y: i + 1}));
}
replSet.awaitLastOpCommitted();
// Sanity check.
assert.eq(secondaryDB.getCollection(collName).find({x: 0}).itcount(), 100);
assert.eq(secondaryDB.getCollection(collName).find({y: {$gte: 1, $lt: 101}}).itcount(), 100);
// Prevent a batch from completing on the secondary.
let pauseAwait = secondaryReadsTest.pauseSecondaryBatchApplication();
// Update x to 1 in each document with default writeConcern and make sure we see the correct
// data on the primary.
let updates = [];
for (let i = 0; i < 100; i++) {
updates[i] = {q: {_id: i}, u: {x: 1, y: i}};
}
assert.commandWorked(primaryDB.runCommand({update: collName, updates: updates}));
assert.eq(primaryColl.find({x: 1}).itcount(), 100);
assert.eq(primaryColl.find({y: {$gte: 0, $lt: 100}}).itcount(), 100);
// Wait for the batch application to pause.
pauseAwait();
let levels = ["local", "available", "majority"];
// We should see the previous, un-replicated state on the secondary with every readconcern.
for (let i in levels) {
print("Checking that no new updates are visible yet for readConcern: " + levels[i]);
assert.eq(secondaryDB.getCollection(collName).find({x: 0}).readConcern(levels[i]).itcount(),
100);
assert.eq(secondaryDB.getCollection(collName).find({x: 1}).readConcern(levels[i]).itcount(),
0);
assert.eq(secondaryDB.getCollection(collName)
.find({y: {$gte: 1, $lt: 101}})
.readConcern(levels[i])
.itcount(),
100);
}
// Disable the failpoint and let the batch complete.
secondaryReadsTest.resumeSecondaryBatchApplication();
replSet.awaitLastOpCommitted();
for (let i in levels) {
print("Checking that new updates are visible for readConcern: " + levels[i]);
// We should see the new state on the secondary with every readconcern.
assert.eq(secondaryDB.getCollection(collName).find({x: 0}).readConcern(levels[i]).itcount(),
0);
assert.eq(secondaryDB.getCollection(collName).find({x: 1}).readConcern(levels[i]).itcount(),
100);
}
secondaryReadsTest.stop();
})();
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