// Check cases where index scans are aborted due to the collection being dropped.  SERVER-4400

t = db.jstests_queryoptimizer3;
t.drop();

p = startParallelShell(
    'for( i = 0; i < 400; ++i ) { sleep( 50 ); db.jstests_queryoptimizer3.drop(); }');

for (i = 0; i < 100; ++i) {
    t.drop();
    t.ensureIndex({a: 1});
    t.ensureIndex({b: 1});
    for (j = 0; j < 100; ++j) {
        t.save({a: j, b: j});
    }

    try {
        m = i % 5;
        if (m == 0) {
            t.count({a: {$gte: 0}, b: {$gte: 0}});
        } else if (m == 1) {
            t.find({a: {$gte: 0}, b: {$gte: 0}}).itcount();
        } else if (m == 2) {
            t.remove({a: {$gte: 0}, b: {$gte: 0}});
        } else if (m == 3) {
            t.update({a: {$gte: 0}, b: {$gte: 0}}, {});
        } else if (m == 4) {
            t.distinct('x', {a: {$gte: 0}, b: {$gte: 0}});
        }
    } catch (e) {
        print("Op killed during yield: " + e.message);
    }
}

p();

// Ensure that the server is still responding.
assert.commandWorked(db.runCommand({isMaster: 1}));