From 286e5d9d36dcf7217560392644563c39fc6f5b1f Mon Sep 17 00:00:00 2001
From: Wieger Steggerda <wieger@uber.com>
Date: Thu, 12 Nov 2015 15:12:25 +0100
Subject: [PATCH] Don't disseminate join list

---
 lib/gossip/dissemination.js   |  8 ++++++++
 lib/on_membership_event.js    |  2 --
 test/integration/join-test.js | 29 ++++++++++++++++++++++-------
 3 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/lib/gossip/dissemination.js b/lib/gossip/dissemination.js
index a9e72ddd..88743b1b 100644
--- a/lib/gossip/dissemination.js
+++ b/lib/gossip/dissemination.js
@@ -132,6 +132,14 @@ Dissemination.prototype.resetMaxPiggybackCount = function resetMaxPiggybackCount
     this.maxPiggybackCount = Dissemination.Defaults.maxPiggybackCount;
 };
 
+Dissemination.prototype.getChangeByAddress = function getChangeByAddress(address) {
+    return this.changes[address];
+};
+
+Dissemination.prototype.getChangesCount = function getChangesCount() {
+    return Object.keys(this.changes).length;
+};
+
 Dissemination.prototype._issueAs = function _issueAs(filterChange, mapChanges) {
     var changesToDisseminate = [];
 
diff --git a/lib/on_membership_event.js b/lib/on_membership_event.js
index a9c11232..81cc62c9 100644
--- a/lib/on_membership_event.js
+++ b/lib/on_membership_event.js
@@ -54,8 +54,6 @@ function createSetHandler(ringpop) {
                 serversToAdd.push(update.address);
                 ringpop.suspicion.start(update);
             }
-
-            ringpop.dissemination.recordChange(update);
         }
 
         // Must add/remove servers from ring in batch. There are
diff --git a/test/integration/join-test.js b/test/integration/join-test.js
index a4803822..6cf3dc87 100644
--- a/test/integration/join-test.js
+++ b/test/integration/join-test.js
@@ -27,7 +27,7 @@ var testRingpopCluster = require('../lib/test-ringpop-cluster.js');
 test('bootstrap with self is ok', function t(assert) {
     var ringpop = allocRingpop();
 
-    ringpop.bootstrap([ringpop.hostPort], onBootstrap);
+    ringpop.bootstrap([ringpop.whoami()], onBootstrap);
 
     function onBootstrap(err) {
         assert.ifError(err);
@@ -40,7 +40,7 @@ testRingpopCluster({
     size: 1,
     waitForConvergence: false
 }, 'one node can join', function t(bootRes, cluster, assert) {
-    assert.ifErr(bootRes[cluster[0].hostPort].err, 'no error occurred');
+    assert.ifErr(bootRes[cluster[0].whoami()].err, 'no error occurred');
     assert.end();
 });
 
@@ -74,11 +74,11 @@ testRingpopCluster({
 }, 'three nodes, one of them bad, join size equals one', function t(bootRes, cluster, assert) {
     assert.equal(cluster.length, 3, 'cluster of 3');
 
-    var badNode = cluster[2].hostPort;
+    var badNode = cluster[2].whoami();
 
     cluster.forEach(function eachNode(node) {
         assert.ok(node.isReady, 'node is ready');
-        var nodesJoined = bootRes[node.hostPort].nodesJoined;
+        var nodesJoined = bootRes[node.whoami()].nodesJoined;
         assert.ok(nodesJoined.length >= 1, 'joined at least one other node');
         assert.ok(nodesJoined.indexOf(badNode) === -1, 'no one can join bad node');
     });
@@ -99,7 +99,7 @@ testRingpopCluster({
 
     cluster.forEach(function eachNode(node) {
         assert.notok(node.isReady, 'node is not ready');
-        assert.equal(bootRes[node.hostPort].err.type,
+        assert.equal(bootRes[node.whoami()].err.type,
             'ringpop.join-duration-exceeded',
             'join duration exceeded error');
     });
@@ -107,6 +107,21 @@ testRingpopCluster({
     assert.end();
 });
 
+testRingpopCluster({
+    // We disable gossip because we don't want to exhaust the changes through pings
+    autoGossip: false,
+    waitForConvergence: false
+}, 'do not disseminate join list', function t(bootRes, cluster, assert) {
+    assert.plan(9);
+    cluster.forEach(function eachNode(node) {
+        assert.equal(node.dissemination.getChangesCount(), 1, 'only one change to be disseminated');
+        var change = node.dissemination.getChangeByAddress(node.whoami());
+        assert.ok(change, 'changes should contain this node\'s address');
+        assert.equal(change.address, node.whoami(), 'address matches');
+    });
+    assert.end();
+});
+
 testRingpopCluster({
     size: 25
 }, 'mega cluster', function t(bootRes, cluster, assert) {
@@ -129,7 +144,7 @@ testRingpopCluster({
                 res.headers.as = 'raw';
                 res.sendOk(null, JSON.stringify({
                     app: 'test',
-                    coordinator: cluster[1].hostPort,
+                    coordinator: cluster[1].whoami(),
                     membership: cluster[1].dissemination.fullSync()
                 }));
             }, 100);
@@ -141,7 +156,7 @@ testRingpopCluster({
 
     var slowJoiner = cluster[0];
     assert.notok(slowJoiner.isReady, 'node one is not ready');
-    assert.equal(bootRes[slowJoiner.hostPort].err.type, 'ringpop.join-aborted',
+    assert.equal(bootRes[slowJoiner.whoami()].err.type, 'ringpop.join-aborted',
         'join aborted error');
 
     assert.ok(cluster[1].isReady, 'node two is ready');