jstests/core/sortb.js


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// Test that the in memory sort capacity limit is checked for all "top N" sort candidates.
// SERVER-4716
(function() {
    "use strict";

    load("jstests/libs/fixture_helpers.js");  // For FixtureHelpers.

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

    t.ensureIndex({b: 1});

    let i;
    for (i = 0; i < 100; ++i) {
        t.save({a: i, b: i});
    }

    const numShards = FixtureHelpers.numberOfShardsForCollection(t);
    const numLargeDocumentsToWrite = 120 * numShards;

    // These large documents will not be part of the initial set of "top 100" matches, and they will
    // not be part of the final set of "top 100" matches returned to the client.  However, they are
    // an intermediate set of "top 100" matches and should trigger an in memory sort capacity
    // exception.
    const big = new Array(1024 * 1024).toString();
    for (; i < 100 + numLargeDocumentsToWrite; ++i) {
        t.save({a: i, b: i, big: big});
    }

    for (; i < 200 + numLargeDocumentsToWrite; ++i) {
        t.save({a: i, b: i});
    }

    assert.throws(function() {
        t.find().sort({a: -1}).hint({b: 1}).limit(100).itcount();
    });
    assert.throws(function() {
        t.find().sort({a: -1}).hint({b: 1}).showDiskLoc().limit(100).itcount();
    });
    t.drop();
})();