HDFS-10850. getEZForPath should NOT throw FNF. Contributed by Andrew Wang.

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java

@@ -2599,8 +2599,8 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
     try (TraceScope ignored = newPathTraceScope("getEZForPath", src)) {
       return namenode.getEZForPath(src);
     } catch (RemoteException re) {
-      throw re.unwrapRemoteException(FileNotFoundException.class,
-          AccessControlException.class, UnresolvedPathException.class);
+      throw re.unwrapRemoteException(AccessControlException.class,
+          UnresolvedPathException.class);
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsAdmin.java

@@ -328,14 +328,13 @@ public class HdfsAdmin {
    * Get the path of the encryption zone for a given file or directory.
    *
    * @param path The path to get the ez for.
-   *
-   * @return The EncryptionZone of the ez, or null if path is not in an ez.
+   * @return An EncryptionZone, or null if path does not exist or is not in an
+   * ez.
    * @throws IOException            if there was a general IO exception
    * @throws AccessControlException if the caller does not have access to path
-   * @throws FileNotFoundException  if the path does not exist
    */
   public EncryptionZone getEncryptionZoneForPath(Path path)
-    throws IOException, AccessControlException, FileNotFoundException {
+      throws IOException, AccessControlException {
     return dfs.getEZForPath(path);
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirEncryptionZoneOp.java

@@ -19,7 +19,6 @@ package org.apache.hadoop.hdfs.server.namenode;
 
 import static org.apache.hadoop.hdfs.server.common.HdfsServerConstants.CRYPTO_XATTR_FILE_ENCRYPTION_INFO;
 
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.security.GeneralSecurityException;
 import java.security.PrivilegedExceptionAction;
@@ -184,9 +183,6 @@ final class FSDirEncryptionZoneOp {
     fsd.readLock();
     try {
       iip = fsd.resolvePath(pc, srcArg);
-      if (iip.getLastINode() == null) {
-        throw new FileNotFoundException("Path not found: " + iip.getPath());
-      }
       if (fsd.isPermissionEnabled()) {
         fsd.checkPathAccess(pc, iip, FsAction.READ);
       }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestEncryptionZones.java

@@ -97,6 +97,7 @@ import org.junit.Before;
 import org.junit.Test;
 import org.mockito.Mockito;
 
+import static org.junit.Assert.assertNotNull;
 import static org.mockito.Matchers.anyBoolean;
 import static org.mockito.Matchers.anyLong;
 import static org.mockito.Matchers.anyObject;
@@ -604,13 +605,8 @@ public class TestEncryptionZones {
           assertExceptionContains("Permission denied:", e);
         }
 
-        try {
-          userAdmin.getEncryptionZoneForPath(nonexistent);
-          fail("FileNotFoundException should be thrown for a non-existent"
-              + " file path");
-        } catch (FileNotFoundException e) {
-          assertExceptionContains("Path not found: " + nonexistent, e);
-        }
+        assertNull("expected null for nonexistent path",
+            userAdmin.getEncryptionZoneForPath(nonexistent));
 
         // Check operation with non-ez paths
         assertNull("expected null for non-ez path",
@@ -638,20 +634,10 @@ public class TestEncryptionZones {
         assertEquals("expected ez path", allPath.toString(),
             userAdmin.getEncryptionZoneForPath(
                 new Path(snapshottedAllPath)).getPath().toString());
-        try {
-          userAdmin.getEncryptionZoneForPath(allPathFile);
-          fail("FileNotFoundException should be thrown for a non-existent"
-              + " file path");
-        } catch (FileNotFoundException e) {
-          assertExceptionContains("Path not found: " + allPathFile, e);
-        }
-        try {
-          userAdmin.getEncryptionZoneForPath(allPath);
-          fail("FileNotFoundException should be thrown for a non-existent"
-              + " file path");
-        } catch (FileNotFoundException e) {
-          assertExceptionContains("Path not found: " + allPath, e);
-        }
+        assertNull("expected null for deleted file path",
+            userAdmin.getEncryptionZoneForPath(allPathFile));
+        assertNull("expected null for deleted directory path",
+            userAdmin.getEncryptionZoneForPath(allPath));
         return null;
       }
     });
@@ -1498,25 +1484,18 @@ public class TestEncryptionZones {
   }
 
   @Test(timeout = 60000)
-  public void testGetEncryptionZoneOnANonExistentZoneFile() throws Exception {
-    final Path ez = new Path("/ez");
-    fs.mkdirs(ez);
-    dfsAdmin.createEncryptionZone(ez, TEST_KEY, NO_TRASH);
-    Path zoneFile = new Path(ez, "file");
-    try {
-      fs.getEZForPath(zoneFile);
-      fail("FileNotFoundException should be thrown for a non-existent"
-          + " file path");
-    } catch (FileNotFoundException e) {
-      assertExceptionContains("Path not found: " + zoneFile, e);
-    }
-    try {
-      dfsAdmin.getEncryptionZoneForPath(zoneFile);
-      fail("FileNotFoundException should be thrown for a non-existent"
-          + " file path");
-    } catch (FileNotFoundException e) {
-      assertExceptionContains("Path not found: " + zoneFile, e);
-    }
+  public void testGetEncryptionZoneOnANonExistentPaths() throws Exception {
+    final Path ezPath = new Path("/ez");
+    fs.mkdirs(ezPath);
+    dfsAdmin.createEncryptionZone(ezPath, TEST_KEY, NO_TRASH);
+    Path zoneFile = new Path(ezPath, "file");
+    EncryptionZone ez = fs.getEZForPath(zoneFile);
+    assertNotNull("Expected EZ for non-existent path in EZ", ez);
+    ez = dfsAdmin.getEncryptionZoneForPath(zoneFile);
+    assertNotNull("Expected EZ for non-existent path in EZ", ez);
+    ez = dfsAdmin.getEncryptionZoneForPath(
+        new Path("/does/not/exist"));
+    assertNull("Expected null for non-existent path not in EZ", ez);
   }
 
   @Test(timeout = 120000)