jstests/replsets/drop_collections_two_phase_dbhash.js


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/**
 * Test to ensure that computation of dbHash ignores drop pending collections, when performing a two
 * phase collection drop.
 */

(function() {
'use strict';

load("jstests/replsets/libs/two_phase_drops.js");  // For TwoPhaseDropCollectionTest.

// Compute db hash for all collections on given database.
function getDbHash(database) {
    let res = assert.commandWorked(database.runCommand({dbhash: 1}), "'dbHash' command failed.");
    return res.md5;
}

// Set up a two phase drop test.
let testName = "drop_collection_two_phase_long_index_names";
let dbName = testName;
let collName = "collToDrop";
let twoPhaseDropTest = new TwoPhaseDropCollectionTest(testName, dbName);

// Initialize replica set.
let replTest = twoPhaseDropTest.initReplSet();

// Check for 'system.drop' two phase drop support.
if (!twoPhaseDropTest.supportsDropPendingNamespaces()) {
    jsTestLog('Drop pending namespaces not supported by storage engine. Skipping test.');
    twoPhaseDropTest.stop();
    return;
}

let primaryDB = replTest.getPrimary().getDB(dbName);

// Create the collection that will be dropped.
twoPhaseDropTest.createCollection(collName);

// Save the dbHash while drop is in 'pending' state.
twoPhaseDropTest.prepareDropCollection(collName);
let dropPendingDbHash = getDbHash(primaryDB);

// Save the dbHash after the drop has been committed.
twoPhaseDropTest.commitDropCollection(collName);
let dropCommittedDbHash = getDbHash(primaryDB);

// The dbHash calculation should ignore drop pending collections. Therefore, therefore, the hash
// during prepare phase and commit phase should match.
let failMsg = "dbHash during drop pending phase did not match dbHash after drop was committed.";
assert.eq(dropPendingDbHash, dropCommittedDbHash, failMsg);

replTest.stopSet();
})();