From 13b54a669e90751f0402931e1428fb6087114256 Mon Sep 17 00:00:00 2001
From: Harald Musum <musum@yahoo-inc.com>
Date: Wed, 20 Dec 2017 15:45:10 +0100
Subject: Revert "Hmusum/order zookeeper server list so localhost comes first"

---
 .../main/java/com/yahoo/vespa/curator/Curator.java | 30 ++++++++--------------
 .../com/yahoo/vespa/zookeeper/CuratorTest.java     | 17 +-----------
 2 files changed, 11 insertions(+), 36 deletions(-)

diff --git a/zkfacade/src/main/java/com/yahoo/vespa/curator/Curator.java b/zkfacade/src/main/java/com/yahoo/vespa/curator/Curator.java
index a9d099fea31..15257e11cbe 100644
--- a/zkfacade/src/main/java/com/yahoo/vespa/curator/Curator.java
+++ b/zkfacade/src/main/java/com/yahoo/vespa/curator/Curator.java
@@ -3,7 +3,6 @@ package com.yahoo.vespa.curator;
 
 import com.google.inject.Inject;
 import com.yahoo.cloud.config.ConfigserverConfig;
-import com.yahoo.net.HostName;
 import com.yahoo.path.Path;
 import com.yahoo.vespa.curator.recipes.CuratorCounter;
 import com.yahoo.vespa.zookeeper.ZooKeeperServer;
@@ -22,8 +21,8 @@ import org.apache.curator.framework.state.ConnectionState;
 import org.apache.curator.framework.state.ConnectionStateListener;
 import org.apache.curator.retry.ExponentialBackoffRetry;
 
+import java.io.Closeable;
 import java.time.Duration;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
@@ -70,26 +69,17 @@ public class Curator implements AutoCloseable {
     }
     
     private static String createConnectionSpec(ConfigserverConfig config) {
-        List<String> servers = createAndOrderServerList(config);
-        return String.join(",", servers);
-    }
-
-    private static List<String> createAndOrderServerList(ConfigserverConfig config) {
-        String hostName = HostName.getLocalhost();
-        int configServerCount = config.zookeeperserver().size();
-        List<String> servers = new ArrayList<>();
-
-        int indexForThisConfigServer = 0;
-        for (int i = 0; i < configServerCount; i++) {
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < config.zookeeperserver().size(); i++) {
             ConfigserverConfig.Zookeeperserver server = config.zookeeperserver(i);
-            servers.add(server.hostname() + ":" + server.port());
-            if (server.hostname().equals(hostName))
-                indexForThisConfigServer = i;
+            sb.append(server.hostname());
+            sb.append(":");
+            sb.append(server.port());
+            if (i < config.zookeeperserver().size() - 1) {
+                sb.append(",");
+            }
         }
-        // Rotate list of servers so that config server on this host is first in the list
-        if (indexForThisConfigServer != 0)
-            Collections.rotate(servers, configServerCount - indexForThisConfigServer);
-        return servers;
+        return sb.toString();
     }
 
     /** 
diff --git a/zkfacade/src/test/java/com/yahoo/vespa/zookeeper/CuratorTest.java b/zkfacade/src/test/java/com/yahoo/vespa/zookeeper/CuratorTest.java
index 396555d5e3a..36205bdaca3 100644
--- a/zkfacade/src/test/java/com/yahoo/vespa/zookeeper/CuratorTest.java
+++ b/zkfacade/src/test/java/com/yahoo/vespa/zookeeper/CuratorTest.java
@@ -2,7 +2,6 @@
 package com.yahoo.vespa.zookeeper;
 
 import com.yahoo.cloud.config.ConfigserverConfig;
-import com.yahoo.net.HostName;
 import com.yahoo.vespa.curator.Curator;
 import org.apache.curator.test.TestingServer;
 import org.junit.After;
@@ -12,8 +11,8 @@ import org.junit.Test;
 import java.io.IOException;
 
 import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThat;
-import static org.junit.Assert.assertTrue;
 
 /**
  * Sets up actual ZooKeeper servers and verifies we can talk to them.
@@ -75,20 +74,6 @@ public class CuratorTest {
         }
     }
 
-    @Test
-    public void require_that_server_order_is_correct() {
-        ConfigserverConfig.Builder builder = new ConfigserverConfig.Builder();
-        builder.zookeeperserver(createZKBuilder("localhost", port1));
-        builder.zookeeperserver(createZKBuilder(HostName.getLocalhost(), port2));
-        builder.zookeeperserver(createZKBuilder("localhost", 1234));
-        builder.zookeeperserver(createZKBuilder("localhost", 6789));
-        try (Curator curator = createCurator(new ConfigserverConfig(builder))) {
-            assertThat(curator.serverCount(), is(4));
-            // host this is running on should come first
-            assertTrue(curator.connectionSpec().startsWith(HostName.getLocalhost() + ":" + port2 + ",localhost:1234"));
-        }
-    }
-
     private ConfigserverConfig createTestConfig() {
         ConfigserverConfig.Builder builder = new ConfigserverConfig.Builder();
         builder.zookeeperserver(createZKBuilder("localhost", port1));
-- 
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