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// Tests that adding an equivalent shard multiple times returns success.
(function() {
'use strict';
const st = new ShardingTest({name: "add_shard_idempotent", shards: 1});
jsTestLog("Testing adding a replica set shard multiple times");
const shard2 = new ReplSetTest({name: 'rsShard', nodes: 3});
shard2.startSet({shardsvr: ""});
shard2.initiate();
shard2.getPrimary(); // Wait for there to be a primary
const shard2SeedList1 = shard2.name + "/" + shard2.nodes[0].host;
const shard2SeedList2 = shard2.name + "/" + shard2.nodes[2].host;
assert.commandWorked(st.admin.runCommand({addshard: shard2SeedList1, name: "newShard2"}));
// Running the identical addShard command should succeed.
assert.commandWorked(st.admin.runCommand({addshard: shard2SeedList1, name: "newShard2"}));
// We can only compare replica sets by their set name, so calling addShard with a different
// seed list should still be considered a successful no-op.
assert.commandWorked(st.admin.runCommand({addshard: shard2SeedList2, name: "newShard2"}));
// Verify that the config.shards collection looks right.
const shards = st.s.getDB('config').shards.find().toArray();
assert.eq(2, shards.length);
let shard1TopologyTime, shard2TopologyTime;
for (let i = 0; i < shards.length; i++) {
let shard = shards[i];
if (shard._id != 'newShard2') {
assert(shard.topologyTime instanceof Timestamp);
shard1TopologyTime = shard.topologyTime;
} else {
assert.eq('newShard2', shard._id);
assert.eq(shard2.getURL(), shard.host);
assert(shard.topologyTime instanceof Timestamp);
shard2TopologyTime = shard.topologyTime;
}
}
assert.gt(shard2TopologyTime, shard1TopologyTime);
shard2.stopSet();
st.stop();
})();
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