HDFS-2969. ExtendedBlock.equals is incorrectly implemented. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1245829 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -47,6 +47,8 @@ Release 0.23.2 - UNRELEASED
     HDFS-2938. Recursive delete of a large directory make namenode
     unresponsive. (Hari Mankude via suresh)
 
+    HDFS-2969. ExtendedBlock.equals is incorrectly implemented (todd)
+
 Release 0.23.1 - 2012-02-08 
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ExtendedBlock.java

@@ -145,7 +145,7 @@ public class ExtendedBlock implements Writable {
       return false;
     }
     ExtendedBlock b = (ExtendedBlock)o;
-    return b.block.equals(block) || b.poolId.equals(poolId);
+    return b.block.equals(block) && b.poolId.equals(poolId);
   }
   
   @Override // Object

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocol/TestExtendedBlock.java

@@ -0,0 +1,56 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF 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.apache.hadoop.hdfs.protocol;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+
+public class TestExtendedBlock {
+  static final String POOL_A = "blockpool-a";
+  static final String POOL_B = "blockpool-b";
+  static final Block BLOCK_1_GS1 = new Block(1L, 100L, 1L);
+  static final Block BLOCK_1_GS2 = new Block(1L, 100L, 2L);
+  static final Block BLOCK_2_GS1 = new Block(2L, 100L, 1L);
+  
+  @Test
+  public void testEquals() {
+    // Same block -> equal
+    assertEquals(
+        new ExtendedBlock(POOL_A, BLOCK_1_GS1),
+        new ExtendedBlock(POOL_A, BLOCK_1_GS1));
+    // Different pools, same block id -> not equal
+    assertNotEquals(
+        new ExtendedBlock(POOL_A, BLOCK_1_GS1),
+        new ExtendedBlock(POOL_B, BLOCK_1_GS1));
+    // Same pool, different block id -> not equal
+    assertNotEquals(
+        new ExtendedBlock(POOL_A, BLOCK_1_GS1),
+        new ExtendedBlock(POOL_A, BLOCK_2_GS1));
+    // Same block, different genstamps -> equal
+    assertEquals(
+        new ExtendedBlock(POOL_A, BLOCK_1_GS1),
+        new ExtendedBlock(POOL_A, BLOCK_1_GS2));
+  }
+
+  private static void assertNotEquals(Object a, Object b) {
+    assertFalse("expected not equal: '" + a + "' and '" + b + "'",
+        a.equals(b));
+  }
+}