mongodb/jstests/sharding/hash_shard_unique_compound.js

// Basic test of sharding with a hashed shard key and other unique index
// Does 2 things and checks for consistent error:
//  1.) shard collection on hashed "a", ensure unique index {a:1, b:1}
//  2.) reverse order

// This test triggers a compiler bug that causes a crash when compiling with optimizations on, see
// SERVER-36321.
// @tags: [blacklist_from_rhel_67_s390x]
(function() {
    'use strict';

    var s = new ShardingTest({shards: 1, mongos: 1});
    var dbName = "test";
    var collName = "foo";
    var ns = dbName + "." + collName;
    var db = s.getDB(dbName);
    var coll = db.getCollection(collName);

    // Enable sharding on DB
    assert.commandWorked(db.adminCommand({enablesharding: dbName}));

    // Shard a fresh collection using a hashed shard key
    assert.commandWorked(db.adminCommand({shardcollection: ns, key: {a: "hashed"}}));

    // Create unique index
    assert.commandWorked(coll.ensureIndex({a: 1, b: 1}, {unique: true}));

    jsTest.log("------ indexes -------");
    jsTest.log(tojson(coll.getIndexes()));

    // Second Part
    jsTest.log("------ dropping sharded collection to start part 2 -------");
    coll.drop();

    // Create unique index
    assert.commandWorked(coll.ensureIndex({a: 1, b: 1}, {unique: true}));

    // shard a fresh collection using a hashed shard key
    assert.commandWorked(db.adminCommand({shardcollection: ns, key: {a: "hashed"}}),
                         "shardcollection didn't worked 2");

    s.printShardingStatus();
    jsTest.log("------ indexes 2-------");
    jsTest.log(tojson(coll.getIndexes()));

    s.stop();
})();