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/**
* Test the procedure for renaming a replica set.
*
* 1. Restart each node in the set in standalone mode.
* 2. Replace each node's config doc with a doc that contains the new name.
* 3. Restart the node as part of the newly named replica set.
*
* @tags: [requires_persistence]
*/
(function() {
"use strict";
const replTest = new ReplSetTest({name: 'testSet', nodes: 2});
let nodes = replTest.startSet();
replTest.initiate();
let primary = replTest.getPrimary();
const dbName = "test";
const collName = jsTestName();
let coll = primary.getDB(dbName)[collName];
const newReplSetName = "newTestSet";
// Make sure a write can be replicated to every node in the set. We set journaling to true to ensure
// this write is durable before restarting the nodes below.
assert.commandWorked(coll.insert({a: 1}, {"writeConcern": {"w": 2, "j": true}}));
// Restart all nodes in the set as standalones.
nodes = replTest.restart(nodes, {noReplSet: true});
// Change each node's config to have the new replica set name.
replTest.nodes.forEach(function(node) {
let replsetColl = node.getDB("local").system.replset;
let doc = replsetColl.findOne();
let oldName = doc._id;
doc._id = newReplSetName;
// We can't update the doc since the replica set is the _id, so insert a new config and remove
// the old one.
replsetColl.insert(doc);
replsetColl.remove({_id: oldName});
// Restart the node now as part of the newly named replica set.
replTest.restart(node, {replSet: newReplSetName});
});
// The nodes will only be able to elect a new primary if both nodes have the same replSet name.
primary = replTest.getPrimary();
let secondary = replTest.getSecondary();
coll = primary.getDB(dbName)[collName];
let primaryReplSetName = primary.getDB("local").system.replset.findOne()._id;
let secondaryReplSetName = secondary.getDB("local").system.replset.findOne()._id;
assert.eq(primaryReplSetName, newReplSetName);
assert.eq(secondaryReplSetName, newReplSetName);
// Make sure a write can still be replicated to every node in the set after the rename.
assert.commandWorked(coll.insert({b: 2}, {"writeConcern": {"w": 2}}));
replTest.stopSet();
}());
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