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/**
* Tests that trying to perform reshardCollection with a resharding key that matches the
* collection's existing shard key is a noop (which can be done by confirming the collection's UUID
* remains unchanged after the operation).
*
* @tags: [uses_atclustertime, requires_fcv_49,]
*/
(function() {
"use strict";
load("jstests/libs/uuid_util.js");
load("jstests/sharding/libs/create_sharded_collection_util.js");
const st = new ShardingTest({
mongos: 1,
config: 1,
shards: 2,
rs: {nodes: 2},
});
const sourceCollection = st.s.getCollection("reshardingDb.coll");
CreateShardedCollectionUtil.shardCollectionWithChunks(sourceCollection, {key: 1}, [
{min: {key: MinKey}, max: {key: 0}, shard: st.shard0.shardName},
{min: {key: 0}, max: {key: MaxKey}, shard: st.shard1.shardName},
]);
const ns = sourceCollection.getFullName();
const mongos = sourceCollection.getMongo();
const sourceDB = sourceCollection.getDB();
// The UUID should remain the same if the resharding key matches the existing shard key.
const preReshardCollectionUUID = getUUIDFromListCollections(sourceDB, sourceCollection.getName());
assert.commandWorked(mongos.adminCommand({reshardCollection: ns, key: {key: 1}}));
const postReshardCollectionUUID = getUUIDFromListCollections(sourceDB, sourceCollection.getName());
assert.eq(preReshardCollectionUUID, postReshardCollectionUUID);
st.stop();
})();
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