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/**
* Tests that secondaries drain side writes while waiting for the primary to commit an index build.
*
* This test does not make very many correctness assertions because this exercises a performance
* optimization. Instead we log the time difference between how long the primary and secondary took
* to complete the index builds. The expectation is that these values are close to each other.
*
* @tags: [
* requires_replication,
* ]
*
*/
(function() {
load("jstests/noPassthrough/libs/index_build.js");
const replSet = new ReplSetTest({
nodes: [
{},
{
// Disallow elections on secondary.
rsConfig: {
priority: 0,
votes: 0,
},
},
]
});
replSet.startSet();
replSet.initiate();
const primary = replSet.getPrimary();
const dbName = 'test';
const primaryDB = primary.getDB(dbName);
const coll = primaryDB.test;
let insertDocs = function(numDocs) {
const bulk = coll.initializeUnorderedBulkOp();
for (let i = 0; i < numDocs; i++) {
bulk.insert({a: i, b: i});
}
assert.commandWorked(bulk.execute());
};
insertDocs(10000);
replSet.awaitReplication();
// Start and pause the index build on the primary so that it does not start collection scanning.
IndexBuildTest.pauseIndexBuilds(primary);
const createIdx = IndexBuildTest.startIndexBuild(primary, coll.getFullName(), {a: 1, b: 1});
const secondary = replSet.getSecondary();
const secondaryDB = secondary.getDB(dbName);
// Wait until the secondary reports that it is ready to commit.
// "Index build waiting for next action before completing final phase"
checkLog.containsJson(secondary, 3856203);
// Insert a high volume of documents. Since the secondary has reported that it is ready to commit,
// the expectation is that the secondary will intercept and drain these writes as they are
// replicated from primary.
insertDocs(50000);
// "index build: drained side writes"
checkLog.containsJson(secondary, 20689);
// Record how long it takes for the index build to complete from this point onward.
let start = new Date();
IndexBuildTest.resumeIndexBuilds(primary);
// Wait for index build to finish on primary.
createIdx();
let primaryEnd = new Date();
// Wait for the index build to complete on the secondary.
IndexBuildTest.waitForIndexBuildToStop(secondaryDB);
let secondaryEnd = new Date();
// We don't make any assertions about these times, just report them for informational purposes. The
// expectation is that they are as close to each other as possible, which would suggest that the
// secondary does not spend more time completing the index than the primary.
jsTestLog("these values should be similar:");
jsTestLog("elapsed on primary: " + (primaryEnd - start));
jsTestLog("elapsed on secondary: " + (secondaryEnd - start));
IndexBuildTest.assertIndexes(coll, 2, ['_id_', 'a_1_b_1']);
replSet.stopSet();
})();
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