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/**
* Confirms that index creation on a secondary does not use the optimization for empty collections
* that a primary would apply to two phase index builds.
*
* This test starts an index build on a non-empty collection but clears the collection
* before the index build is added to the catalog. This causes the secondary to see an empty
* collection.
*
* This test should also work when the primary builds the index single-phased. The secondary should
* be able to optimize for the empty collection case and build the index inlined.
*
* @tags: [
* requires_replication,
* ]
*/
(function() {
"use strict";
load('jstests/noPassthrough/libs/index_build.js');
load("jstests/libs/fail_point_util.js");
// Use a 3-node replica set config to ensure that the primary waits for the secondaries when the
// commit quorum is in effect.
const rst = new ReplSetTest({nodes: 3});
const nodes = rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const testDB = primary.getDB('test');
const coll = testDB.getCollection('test');
assert.commandWorked(coll.insert({a: 1}));
const res = assert.commandWorked(primary.adminCommand(
{configureFailPoint: 'hangBeforeInitializingIndexBuild', mode: 'alwaysOn'}));
const failpointTimesEntered = res.count;
const createIdx = IndexBuildTest.startIndexBuild(primary, coll.getFullName(), {a: 1});
try {
assert.commandWorked(primary.adminCommand({
waitForFailPoint: "hangBeforeInitializingIndexBuild",
timesEntered: failpointTimesEntered + 1,
maxTimeMS: kDefaultWaitForFailPointTimeout
}));
// Remove the document from the collection so that the secondary sees an empty collection.
assert.commandWorked(coll.remove({a: 1}));
} finally {
assert.commandWorked(primary.adminCommand(
{configureFailPoint: 'hangBeforeInitializingIndexBuild', mode: 'off'}));
}
// Expect successful createIndex command invocation in parallel shell. A new index should be
// present on the primary.
createIdx();
IndexBuildTest.assertIndexes(coll, 2, ['_id_', 'a_1']);
rst.awaitReplication();
const secondary = rst.getSecondary();
const secondaryDB = primary.getDB(testDB.getName());
const secondaryColl = secondary.getCollection(coll.getFullName());
IndexBuildTest.assertIndexes(secondaryColl, 2, ['_id_', 'a_1']);
rst.stopSet();
})();
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