MAPREDUCE-4549. Distributed cache conflicts breaks backwards compatability. (Robert Evans via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1420363 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -958,6 +958,9 @@ Release 0.23.3
     MAPREDUCE-4641. Exception in commitJob marks job as successful in job
     history (Jason Lowe via bobby)
 
+    MAPREDUCE-4549. Distributed cache conflicts breaks backwards compatability 
+    (Robert Evans via tucu)
+
 Release 0.23.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/util/MRApps.java

@@ -25,6 +25,8 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.conf.Configuration;
@@ -54,14 +56,14 @@ import org.apache.hadoop.yarn.util.Apps;
 import org.apache.hadoop.yarn.util.BuilderUtils;
 import org.apache.hadoop.yarn.util.ConverterUtils;
 
-import com.google.common.base.Charsets;
-
 /**
  * Helper class for MR applications
  */
 @Private
 @Unstable
 public class MRApps extends Apps {
+  private static final Log LOG = LogFactory.getLog(MRApps.class);
+  
   public static String toString(JobId jid) {
     return jid.toString();
   }
@@ -296,6 +298,16 @@ public class MRApps extends Apps {
     return "cache file (" + MRJobConfig.CACHE_FILES + ") ";
   }
   
+  private static String toString(org.apache.hadoop.yarn.api.records.URL url) {
+    StringBuffer b = new StringBuffer();
+    b.append(url.getScheme()).append("://").append(url.getHost());
+    if(url.getPort() >= 0) {
+      b.append(":").append(url.getPort());
+    }
+    b.append(url.getFile());
+    return b.toString();
+  }
+  
   // TODO - Move this to MR!
   // Use TaskDistributedCacheManager.CacheFiles.makeCacheFiles(URI[], 
   // long[], boolean[], Path[], FileType)
@@ -333,11 +345,15 @@ public class MRApps extends Apps {
         }
         String linkName = name.toUri().getPath();
         LocalResource orig = localResources.get(linkName);
-        if(orig != null && !orig.getResource().equals(
-            ConverterUtils.getYarnUrlFromURI(p.toUri()))) {
-          throw new InvalidJobConfException(
-              getResourceDescription(orig.getType()) + orig.getResource() + 
-              " conflicts with " + getResourceDescription(type) + u);
+        org.apache.hadoop.yarn.api.records.URL url = 
+          ConverterUtils.getYarnUrlFromURI(p.toUri());
+        if(orig != null && !orig.getResource().equals(url)) {
+          LOG.warn(
+              getResourceDescription(orig.getType()) + 
+              toString(orig.getResource()) + " conflicts with " + 
+              getResourceDescription(type) + toString(url) + 
+              " This will be an error in Hadoop 2.0");
+          continue;
         }
         localResources.put(
             linkName,

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/test/java/org/apache/hadoop/mapreduce/v2/util/TestMRApps.java

@@ -29,7 +29,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.FilterFileSystem;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.mapred.InvalidJobConfException;
 import org.apache.hadoop.mapreduce.Job;
 import org.apache.hadoop.mapreduce.JobID;
 import org.apache.hadoop.mapreduce.MRJobConfig;
@@ -38,7 +37,6 @@ import org.apache.hadoop.mapreduce.v2.api.records.JobId;
 import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptId;
 import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
 import org.apache.hadoop.mapreduce.v2.api.records.TaskType;
-import org.apache.hadoop.mapreduce.v2.util.MRApps;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.LocalResource;
 import org.apache.hadoop.yarn.api.records.LocalResourceType;
@@ -47,6 +45,7 @@ import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
+
 import static org.junit.Assert.*;
 import static org.mockito.Mockito.*;
 
@@ -245,7 +244,7 @@ public class TestMRApps {
   }
   
   @SuppressWarnings("deprecation")
-  @Test(expected = InvalidJobConfException.class)
+  @Test
   public void testSetupDistributedCacheConflicts() throws Exception {
     Configuration conf = new Configuration();
     conf.setClass("fs.mockfs.impl", MockFileSystem.class, FileSystem.class);
@@ -273,10 +272,18 @@ public class TestMRApps {
     Map<String, LocalResource> localResources = 
       new HashMap<String, LocalResource>();
     MRApps.setupDistributedCache(conf, localResources);
+    
+    assertEquals(1, localResources.size());
+    LocalResource lr = localResources.get("something");
+    //Archive wins
+    assertNotNull(lr);
+    assertEquals(10l, lr.getSize());
+    assertEquals(10l, lr.getTimestamp());
+    assertEquals(LocalResourceType.ARCHIVE, lr.getType());
   }
   
   @SuppressWarnings("deprecation")
-  @Test(expected = InvalidJobConfException.class)
+  @Test
   public void testSetupDistributedCacheConflictsFiles() throws Exception {
     Configuration conf = new Configuration();
     conf.setClass("fs.mockfs.impl", MockFileSystem.class, FileSystem.class);
@@ -301,6 +308,14 @@ public class TestMRApps {
     Map<String, LocalResource> localResources = 
       new HashMap<String, LocalResource>();
     MRApps.setupDistributedCache(conf, localResources);
+    
+    assertEquals(1, localResources.size());
+    LocalResource lr = localResources.get("something");
+    //First one wins
+    assertNotNull(lr);
+    assertEquals(10l, lr.getSize());
+    assertEquals(10l, lr.getTimestamp());
+    assertEquals(LocalResourceType.FILE, lr.getType());
   }
   
   @SuppressWarnings("deprecation")