mongo/jstests/core/removeb.js

// @tags: [
//   requires_fastcount,
//   requires_non_retryable_writes,
//   uses_multiple_connections,
// ]

// Test removal of Records that have been reused since the remove operation began.  SERVER-5198

(function() {
    "use strict";

    const t = db.jstests_removeb;
    t.drop();

    t.ensureIndex({a: 1});

    // Make the index multikey to trigger cursor dedup checking.
    t.insert({a: [-1, -2]});
    t.remove({});

    const insertDocs = function(collection, nDocs) {
        print("Bulk inserting " + nDocs + " documents");

        const bulk = collection.initializeUnorderedBulkOp();
        for (let i = 0; i < nDocs; ++i) {
            bulk.insert({a: i});
        }

        assert.writeOK(bulk.execute());

        print("Bulk insert " + nDocs + " documents completed");
    };

    insertDocs(t, 20000);

    const p = startParallelShell(function() {
        // Wait until the remove operation (below) begins running.
        while (db.jstests_removeb.count() === 20000) {
        }

        // Insert documents with increasing 'a' values.  These inserted documents may
        // reuse Records freed by the remove operation in progress and will be
        // visited by the remove operation if it has not completed.
        for (let i = 20000; i < 40000; i += 100) {
            const bulk = db.jstests_removeb.initializeUnorderedBulkOp();
            for (let j = 0; j < 100; ++j) {
                bulk.insert({a: i + j});
            }
            assert.writeOK(bulk.execute());
            if (i % 1000 === 0) {
                print(i - 20000 + " of second set of 20000 documents inserted");
            }
        }
    });

    // Remove using the a:1 index in ascending direction.
    var res = t.remove({a: {$gte: 0}});
    assert(!res.hasWriteError(), 'The remove operation failed.');

    p();

    t.drop();
})();