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/**
* Confirms that creating index creation on an empty collection does not require the thread pool
* that we use for hybrid index builds. The fail points that we typically use to suspend hybrid
* should not affect the progress of index builds on empty collections.
* @tags: [
* requires_replication,
* ]
*/
(function() {
"use strict";
load('jstests/noPassthrough/libs/index_build.js');
const rst = new ReplSetTest({
nodes: [
{},
{
// Disallow elections on secondary.
rsConfig: {
priority: 0,
votes: 0,
},
slowms: 30000, // Don't log slow operations on secondary. See SERVER-44821.
},
]
});
const nodes = rst.startSet();
rst.initiate();
const primary = rst.getPrimary();
const testDB = primary.getDB('test');
// This test uses a non-empty collection as a control by suspending index builds on the thread pool.
// The optimization for an empty collection should not go through the code path for an index build
// that requires a collection scan and the hybrid index build machinery for managing side writes.
IndexBuildTest.pauseIndexBuilds(primary);
const coll = testDB.getCollection('test');
assert.commandWorked(coll.insert({a: 1}));
const createIdx = IndexBuildTest.startIndexBuild(primary, coll.getFullName(), {a: 1});
try {
// When the index build starts, find its op id.
const secondaryDB = primary.getDB(testDB.getName());
const opId = IndexBuildTest.waitForIndexBuildToStart(testDB);
// Creating an index on an empty collection should not be affected by the fail point we used
// to suspend index builds.
const emptyColl = testDB.getCollection('emptyColl');
assert.commandWorked(testDB.createCollection(emptyColl.getName()));
// Build index with a writeConcern that ensures the index is finished on all the nodes.
assert.commandWorked(testDB.runCommand({
createIndexes: emptyColl.getName(),
indexes: [{key: {b: 1}, name: 'b_1'}],
writeConcern: {
w: nodes.length,
wtimeout: ReplSetTest.kDefaultTimeoutMS,
},
}));
IndexBuildTest.assertIndexes(emptyColl, 2, ['_id_', 'b_1']);
const secondary = rst.getSecondary();
const secondaryEmptyColl = secondary.getCollection(emptyColl.getFullName());
IndexBuildTest.assertIndexes(secondaryEmptyColl, 2, ['_id_', 'b_1']);
// Index build optimatization for empty collection is replicated via old-style createIndexes
// oplog entry.
const cmdNs = testDB.getCollection('$cmd').getFullName();
const ops = rst.dumpOplog(
primary, {op: 'c', ns: cmdNs, 'o.createIndexes': emptyColl.getName(), 'o.name': 'b_1'});
assert.eq(1,
ops.length,
'createIndexes oplog entry not generated for empty collection: ' + tojson(ops));
} finally {
// Wait for the index build to stop.
IndexBuildTest.resumeIndexBuilds(primary);
IndexBuildTest.waitForIndexBuildToStop(testDB);
}
// 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.stopSet();
})();
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