YARN-7270. Fix unsafe casting from long to int for class Resource and

its sub-classes. (Yufei)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/Resource.java

@@ -466,4 +466,18 @@ public abstract class Resource implements Comparable<Resource> {
     }
     return (int) result;
   }
+
+  /**
+   * Convert long to int for a resource value safely. This method assumes
+   * resource value is positive.
+   *
+   * @param value long resource value
+   * @return int resource value
+   */
+  protected static int castToIntSafely(long value) {
+    if (value > Integer.MAX_VALUE) {
+      return Integer.MAX_VALUE;
+    }
+    return Long.valueOf(value).intValue();
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/impl/LightWeightResource.java

@@ -92,7 +92,7 @@ public class LightWeightResource extends Resource {
   @Override
   @SuppressWarnings("deprecation")
   public int getMemory() {
-    return (int) memoryResInfo.getValue();
+    return castToIntSafely(memoryResInfo.getValue());
   }
 
   @Override
@@ -113,7 +113,7 @@ public class LightWeightResource extends Resource {
 
   @Override
   public int getVirtualCores() {
-    return (int) vcoresResInfo.getValue();
+    return castToIntSafely(vcoresResInfo.getValue());
   }
 
   @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/test/java/org/apache/hadoop/yarn/api/records/TestResource.java

@@ -0,0 +1,43 @@
+/**
+ * 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.yarn.api.records;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * The class to test {@link Resource}.
+ */
+public class TestResource {
+
+  @Test
+  public void testCastToIntSafely() {
+    assertEquals(0, Resource.castToIntSafely(0));
+    assertEquals(1, Resource.castToIntSafely(1));
+    assertEquals(Integer.MAX_VALUE,
+        Resource.castToIntSafely(Integer.MAX_VALUE));
+
+    assertEquals("Cast to Integer.MAX_VALUE if the long is greater than "
+            + "Integer.MAX_VALUE", Integer.MAX_VALUE,
+        Resource.castToIntSafely(Integer.MAX_VALUE + 1L));
+    assertEquals("Cast to Integer.MAX_VALUE if the long is greater than "
+            + "Integer.MAX_VALUE", Integer.MAX_VALUE,
+        Resource.castToIntSafely(Long.MAX_VALUE));
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java

@@ -87,7 +87,7 @@ public class ResourcePBImpl extends Resource {
   @Override
   @SuppressWarnings("deprecation")
   public int getMemory() {
-    return (int) this.getMemorySize();
+    return castToIntSafely(this.getMemorySize());
   }
 
   @Override
@@ -117,7 +117,7 @@ public class ResourcePBImpl extends Resource {
   @Override
   public int getVirtualCores() {
     // vcores should always be present
-    return (int) resources[VCORES_INDEX].getValue();
+    return castToIntSafely(resources[VCORES_INDEX].getValue());
   }
 
   @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/util/resource/Resources.java

@@ -60,17 +60,10 @@ public class Resources {
       initResourceMap();
     }
 
-    private int resourceValueToInt() {
-      if(this.resourceValue > Integer.MAX_VALUE) {
-        return Integer.MAX_VALUE;
-      }
-      return Long.valueOf(this.resourceValue).intValue();
-    }
-
     @Override
     @SuppressWarnings("deprecation")
     public int getMemory() {
-      return resourceValueToInt();
+      return castToIntSafely(resourceValue);
     }
 
     @Override
@@ -91,7 +84,7 @@ public class Resources {
 
     @Override
     public int getVirtualCores() {
-      return resourceValueToInt();
+      return castToIntSafely(resourceValue);
     }
 
     @Override

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/api/TestResourcePBImpl.java

@@ -25,6 +25,8 @@ import org.apache.hadoop.yarn.proto.YarnProtos;
 import org.junit.Assert;
 import org.junit.Test;
 
+import static org.junit.Assert.assertEquals;
+
 /**
  * Test class to handle various proto related tests for resources.
  */
@@ -58,4 +60,29 @@ public class TestResourcePBImpl {
         res.getResourceInformation(ResourceInformation.VCORES.getName())
             .getUnits());
   }
+
+  @Test
+  @SuppressWarnings("deprecation")
+  public void testGetMemory() {
+    Resource res = new ResourcePBImpl();
+    long memorySize = Integer.MAX_VALUE + 1L;
+    res.setMemorySize(memorySize);
+
+    assertEquals("No need to cast if both are long", memorySize,
+        res.getMemorySize());
+    assertEquals("Cast to Integer.MAX_VALUE if the long is greater than "
+            + "Integer.MAX_VALUE", Integer.MAX_VALUE, res.getMemory());
+  }
+
+  @Test
+  public void testGetVirtualCores() {
+    Resource res = new ResourcePBImpl();
+    long vcores = Integer.MAX_VALUE + 1L;
+    res.getResourceInformation("vcores").setValue(vcores);
+
+    assertEquals("No need to cast if both are long", vcores,
+        res.getResourceInformation("vcores").getValue());
+    assertEquals("Cast to Integer.MAX_VALUE if the long is greater than "
+        + "Integer.MAX_VALUE", Integer.MAX_VALUE, res.getVirtualCores());
+  }
 }