Use Base64 encoding for UUID generation (auto generated doc ids, and node ids), closes #422.

modules/elasticsearch/src/main/java/org/elasticsearch/action/bulk/TransportBulkAction.java

@@ -143,7 +143,7 @@ public class TransportBulkAction extends BaseAction<BulkRequest, BulkResponse> {
                 indexRequest.index(clusterState.metaData().concreteIndex(indexRequest.index()));
                 if (allowIdGeneration) {
                     if (indexRequest.id() == null) {
-                        indexRequest.id(UUID.randomUUID().toString());
+                        indexRequest.id(UUID.randomBase64UUID());
                         // since we generate the id, change it to CREATE
                         indexRequest.opType(IndexRequest.OpType.CREATE);
                     }

modules/elasticsearch/src/main/java/org/elasticsearch/action/index/TransportIndexAction.java

@@ -82,7 +82,7 @@ public class TransportIndexAction extends TransportShardReplicationOperationActi
     @Override protected void doExecute(final IndexRequest indexRequest, final ActionListener<IndexResponse> listener) {
         if (allowIdGeneration) {
             if (indexRequest.id() == null) {
-                indexRequest.id(UUID.randomUUID().toString());
+                indexRequest.id(UUID.randomBase64UUID());
                 // since we generate the id, change it to CREATE
                 indexRequest.opType(IndexRequest.OpType.CREATE);
             }

modules/elasticsearch/src/main/java/org/elasticsearch/common/Base64.java

@@ -1,24 +1,7 @@
-/*
- * Licensed to Elastic Search and Shay Banon under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. Elastic Search licenses this
- * file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
 package org.elasticsearch.common;
 
+import java.nio.charset.Charset;
+
 /**
  * <p>Encodes and decodes to and from Base64 notation.</p>
  * <p>Homepage: <a href="http://iharder.net/base64">http://iharder.net/base64</a>.</p>
@@ -246,7 +229,7 @@ public class Base64 {
     /**
      * Preferred encoding.
      */
-    private final static String PREFERRED_ENCODING = "US-ASCII";
+    public final static Charset PREFERRED_ENCODING = Charset.forName("US-ASCII");
 
 
     private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding
@@ -736,13 +719,7 @@ public class Base64 {
         }   // end finally
 
         // Return value according to relevant encoding.
-        try {
         return new String(baos.toByteArray(), PREFERRED_ENCODING);
-        }   // end try
-        catch (java.io.UnsupportedEncodingException uue) {
-            // Fall back to some Java default
-            return new String(baos.toByteArray());
-        }   // end catch
 
     }   // end encode
 
@@ -871,12 +848,7 @@ public class Base64 {
         byte[] encoded = encodeBytesToBytes(source, off, len, options);
 
         // Return value according to relevant encoding.
-        try {
         return new String(encoded, PREFERRED_ENCODING);
-        }   // end try
-        catch (java.io.UnsupportedEncodingException uue) {
-            return new String(encoded);
-        }   // end catch
 
     }   // end encodeBytes
 
@@ -1275,13 +1247,7 @@ public class Base64 {
             throw new NullPointerException("Input string was null.");
         }   // end if
 
-        byte[] bytes;
-        try {
-            bytes = s.getBytes(PREFERRED_ENCODING);
-        }   // end try
-        catch (java.io.UnsupportedEncodingException uee) {
-            bytes = s.getBytes();
-        }   // end catch
+        byte[] bytes = s.getBytes(PREFERRED_ENCODING);
         //</change>
 
         // Decode

modules/elasticsearch/src/main/java/org/elasticsearch/common/UUID.java

@@ -19,6 +19,9 @@
 
 package org.elasticsearch.common;
 
+import org.elasticsearch.ElasticSearchIllegalStateException;
+
+import java.io.IOException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
@@ -105,6 +108,32 @@ public class UUID implements Comparable<UUID> {
         return new UUID(randomBytes);
     }
 
+    public static String randomBase64UUID() {
+        SecureRandom ng = numberGenerator;
+        if (ng == null) {
+            numberGenerator = ng = new SecureRandom();
+        }
+
+        byte[] randomBytes = new byte[16];
+        ng.nextBytes(randomBytes);
+        randomBytes[6] &= 0x0f;  /* clear version        */
+        randomBytes[6] |= 0x40;  /* set to version 4     */
+        randomBytes[8] &= 0x3f;  /* clear variant        */
+        randomBytes[8] |= 0x80;  /* set to IETF variant  */
+
+
+        try {
+            byte[] encoded = Base64.encodeBytesToBytes(randomBytes, 0, randomBytes.length, Base64.URL_SAFE);
+            // we know the bytes are 16, and not a multi of 3, so remove the 2 padding chars that are added
+            assert encoded[encoded.length - 1] == '=';
+            assert encoded[encoded.length - 2] == '=';
+            // we always have padding of two at the end, encode it differently
+            return new String(encoded, 0, encoded.length - 2, Base64.PREFERRED_ENCODING);
+        } catch (IOException e) {
+            throw new ElasticSearchIllegalStateException("should not be thrown");
+        }
+    }
+
     /**
      * Static factory to retrieve a type 3 (name based) <tt>UUID</tt> based on
      * the specified byte array.

modules/elasticsearch/src/main/java/org/elasticsearch/discovery/zen/ZenDiscovery.java

@@ -136,7 +136,7 @@ public class ZenDiscovery extends AbstractLifecycleComponent<Discovery> implemen
     @Override protected void doStart() throws ElasticSearchException {
         Map<String, String> nodeAttributes = buildCommonNodesAttributes(settings);
         // note, we rely on the fact that its a new id each time we start, see FD and "kill -9" handling
-        String nodeId = UUID.randomUUID().toString();
+        String nodeId = UUID.randomBase64UUID();
         localNode = new DiscoveryNode(settings.get("name"), nodeId, transportService.boundAddress().publishAddress(), nodeAttributes);
         latestDiscoNodes = new DiscoveryNodes.Builder().put(localNode).localNodeId(localNode.id()).build();
         nodesFD.updateNodes(latestDiscoNodes);