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From su...@apache.org
Subject hadoop git commit: YARN-6413. FileSystem based Yarn Registry implementation. (Ellen Hui via Subru).
Date Tue, 31 Oct 2017 19:13:34 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2 15b839c44 -> ac4110742


YARN-6413. FileSystem based Yarn Registry implementation. (Ellen Hui via Subru).

(cherry picked from commit ed24da3dd73c137b44235e525112056ace6d3843)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/ac411074
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/ac411074
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/ac411074

Branch: refs/heads/branch-2
Commit: ac41107423890dc622bc87409f5e9f198574fc21
Parents: 15b839c
Author: Subru Krishnan <subru@apache.org>
Authored: Tue Oct 31 12:05:43 2017 -0700
Committer: Subru Krishnan <subru@apache.org>
Committed: Tue Oct 31 12:11:40 2017 -0700

----------------------------------------------------------------------
 .../impl/FSRegistryOperationsService.java       | 249 ++++++++++++++++
 .../registry/client/types/ServiceRecord.java    |  64 ++++
 .../impl/TestFSRegistryOperationsService.java   | 298 +++++++++++++++++++
 3 files changed, 611 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/ac411074/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/impl/FSRegistryOperationsService.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/impl/FSRegistryOperationsService.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/impl/FSRegistryOperationsService.java
new file mode 100644
index 0000000..cfff1bd
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/impl/FSRegistryOperationsService.java
@@ -0,0 +1,249 @@
+/**
+ * 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.registry.client.impl;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.lang.NotImplementedException;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileAlreadyExistsException;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.PathIsNotEmptyDirectoryException;
+import org.apache.hadoop.fs.PathNotFoundException;
+import org.apache.hadoop.registry.client.api.BindFlags;
+import org.apache.hadoop.registry.client.api.RegistryOperations;
+import org.apache.hadoop.registry.client.binding.RegistryTypeUtils;
+import org.apache.hadoop.registry.client.binding.RegistryUtils;
+import org.apache.hadoop.registry.client.exceptions.InvalidPathnameException;
+import org.apache.hadoop.registry.client.exceptions.InvalidRecordException;
+import org.apache.hadoop.registry.client.exceptions.NoRecordException;
+import org.apache.hadoop.registry.client.types.RegistryPathStatus;
+import org.apache.hadoop.registry.client.types.ServiceRecord;
+import org.apache.hadoop.service.CompositeService;
+import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+
+/**
+ * Filesystem-based implementation of RegistryOperations. This class relies
+ * entirely on the configured FS for security and does no extra checks.
+ */
+public class FSRegistryOperationsService extends CompositeService
+    implements RegistryOperations {
+
+  private FileSystem fs;
+  private static final Logger LOG =
+      LoggerFactory.getLogger(FSRegistryOperationsService.class);
+  private final RegistryUtils.ServiceRecordMarshal serviceRecordMarshal =
+      new RegistryUtils.ServiceRecordMarshal();
+
+  public FSRegistryOperationsService() {
+    super(FSRegistryOperationsService.class.getName());
+  }
+
+  @VisibleForTesting
+  public FileSystem getFs() {
+    return this.fs;
+  }
+
+  @Override
+  protected void serviceInit(Configuration conf) {
+    try {
+      this.fs = FileSystem.get(conf);
+      LOG.info("Initialized Yarn-registry with Filesystem "
+          + fs.getClass().getCanonicalName());
+    } catch (IOException e) {
+      LOG.error("Failed to get FileSystem for registry", e);
+      throw new YarnRuntimeException(e);
+    }
+  }
+
+  private Path makePath(String path) {
+    return new Path(path);
+  }
+
+  private Path formatDataPath(String basePath) {
+    return Path.mergePaths(new Path(basePath), new Path("/_record"));
+  }
+
+  private String relativize(String basePath, String childPath) {
+    String relative = new File(basePath).toURI()
+        .relativize(new File(childPath).toURI()).getPath();
+    return relative;
+  }
+
+  @Override
+  public boolean mknode(String path, boolean createParents)
+      throws PathNotFoundException, InvalidPathnameException, IOException {
+    Path registryPath = makePath(path);
+
+    // getFileStatus throws FileNotFound if the path doesn't exist. If the
+    // file already exists, return.
+    try {
+      fs.getFileStatus(registryPath);
+      return false;
+    } catch (FileNotFoundException e) {
+    }
+
+    if (createParents) {
+      // By default, mkdirs creates any parent dirs it needs
+      fs.mkdirs(registryPath);
+    } else {
+      FileStatus parentStatus = null;
+
+      if (registryPath.getParent() != null) {
+        parentStatus = fs.getFileStatus(registryPath.getParent());
+      }
+
+      if (registryPath.getParent() == null || parentStatus.isDirectory()) {
+        fs.mkdirs(registryPath);
+      } else {
+        throw new PathNotFoundException("no parent for " + path);
+      }
+    }
+    return true;
+  }
+
+  @Override
+  public void bind(String path, ServiceRecord record, int flags)
+      throws PathNotFoundException, FileAlreadyExistsException,
+      InvalidPathnameException, IOException {
+
+    // Preserve same overwrite semantics as ZK implementation
+    Preconditions.checkArgument(record != null, "null record");
+    RegistryTypeUtils.validateServiceRecord(path, record);
+
+    Path dataPath = formatDataPath(path);
+    Boolean overwrite = ((flags & BindFlags.OVERWRITE) != 0);
+    if (fs.exists(dataPath) && !overwrite) {
+      throw new FileAlreadyExistsException();
+    } else {
+      // Either the file doesn't exist, or it exists and we're
+      // overwriting. Create overwrites by default and creates parent dirs if
+      // needed.
+      FSDataOutputStream stream = fs.create(dataPath);
+      byte[] bytes = serviceRecordMarshal.toBytes(record);
+      stream.write(bytes);
+      stream.close();
+      LOG.info("Bound record to path " + dataPath);
+    }
+  }
+
+  @Override
+  public ServiceRecord resolve(String path) throws PathNotFoundException,
+      NoRecordException, InvalidRecordException, IOException {
+    // Read the entire file into byte array, should be small metadata
+
+    Long size = fs.getFileStatus(formatDataPath(path)).getLen();
+    byte[] bytes = new byte[size.intValue()];
+
+    FSDataInputStream instream = fs.open(formatDataPath(path));
+    int bytesRead = instream.read(bytes);
+    instream.close();
+
+    if (bytesRead < size) {
+      throw new InvalidRecordException(path,
+          "Expected " + size + " bytes, but read " + bytesRead);
+    }
+
+    // Unmarshal, check, and return
+    ServiceRecord record = serviceRecordMarshal.fromBytes(path, bytes);
+    RegistryTypeUtils.validateServiceRecord(path, record);
+    return record;
+  }
+
+  @Override
+  public RegistryPathStatus stat(String path)
+      throws PathNotFoundException, InvalidPathnameException, IOException {
+    FileStatus fstat = fs.getFileStatus(formatDataPath(path));
+    int numChildren = fs.listStatus(makePath(path)).length;
+
+    RegistryPathStatus regstat =
+        new RegistryPathStatus(fstat.getPath().toString(),
+            fstat.getModificationTime(), fstat.getLen(), numChildren);
+
+    return regstat;
+  }
+
+  @Override
+  public boolean exists(String path) throws IOException {
+    return fs.exists(makePath(path));
+  }
+
+  @Override
+  public List<String> list(String path)
+      throws PathNotFoundException, InvalidPathnameException, IOException {
+    FileStatus[] statArray = fs.listStatus(makePath(path));
+    String basePath = fs.getFileStatus(makePath(path)).getPath().toString();
+
+    List<String> paths = new ArrayList<String>();
+
+    FileStatus stat;
+    // Only count dirs; the _record files are hidden.
+    for (int i = 0; i < statArray.length; i++) {
+      stat = statArray[i];
+      if (stat.isDirectory()) {
+        String relativePath = relativize(basePath, stat.getPath().toString());
+        paths.add(relativePath);
+      }
+    }
+
+    return paths;
+  }
+
+  @Override
+  public void delete(String path, boolean recursive)
+      throws PathNotFoundException, PathIsNotEmptyDirectoryException,
+      InvalidPathnameException, IOException {
+    Path dirPath = makePath(path);
+    if (!fs.exists(dirPath)) {
+      throw new PathNotFoundException(path);
+    }
+
+    // If recursive == true, or dir is empty, delete.
+    if (recursive || list(path).isEmpty()) {
+      fs.delete(makePath(path), true);
+      return;
+    }
+
+    throw new PathIsNotEmptyDirectoryException(path);
+  }
+
+  @Override
+  public boolean addWriteAccessor(String id, String pass) throws IOException {
+    throw new NotImplementedException();
+  }
+
+  @Override
+  public void clearWriteAccessors() {
+    throw new NotImplementedException();
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ac411074/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/types/ServiceRecord.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/types/ServiceRecord.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/types/ServiceRecord.java
index 9403d31..30adac7 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/types/ServiceRecord.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/types/ServiceRecord.java
@@ -245,5 +245,69 @@ public class ServiceRecord implements Cloneable {
     return super.clone();
   }
 
+  @Override
+  public int hashCode() {
+    // Generated by eclipse
+    final int prime = 31;
+    int result = 1;
+    result =
+        prime * result + ((attributes == null) ? 0 : attributes.hashCode());
+    result =
+        prime * result + ((description == null) ? 0 : description.hashCode());
+    result = prime * result + ((external == null) ? 0 : external.hashCode());
+    result = prime * result + ((internal == null) ? 0 : internal.hashCode());
+    result = prime * result + ((type == null) ? 0 : type.hashCode());
+    return result;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    ServiceRecord other = (ServiceRecord) obj;
+    if (attributes == null) {
+      if (other.attributes != null) {
+        return false;
+      }
+    } else if (!attributes.equals(other.attributes)) {
+      return false;
+    }
+    if (description == null) {
+      if (other.description != null) {
+        return false;
+      }
+    } else if (!description.equals(other.description)) {
+      return false;
+    }
+    if (external == null) {
+      if (other.external != null) {
+        return false;
+      }
+    } else if (!external.equals(other.external)) {
+      return false;
+    }
+    if (internal == null) {
+      if (other.internal != null) {
+        return false;
+      }
+    } else if (!internal.equals(other.internal)) {
+      return false;
+    }
+    if (type == null) {
+      if (other.type != null) {
+        return false;
+      }
+    } else if (!type.equals(other.type)) {
+      return false;
+    }
+    return true;
+  }
 
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/ac411074/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/test/java/org/apache/hadoop/registry/client/impl/TestFSRegistryOperationsService.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/test/java/org/apache/hadoop/registry/client/impl/TestFSRegistryOperationsService.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/test/java/org/apache/hadoop/registry/client/impl/TestFSRegistryOperationsService.java
new file mode 100644
index 0000000..dffa4a7
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/test/java/org/apache/hadoop/registry/client/impl/TestFSRegistryOperationsService.java
@@ -0,0 +1,298 @@
+/**
+ * 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.registry.client.impl;
+
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileAlreadyExistsException;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.PathIsNotEmptyDirectoryException;
+import org.apache.hadoop.fs.PathNotFoundException;
+import org.apache.hadoop.registry.client.exceptions.InvalidPathnameException;
+import org.apache.hadoop.registry.client.types.ServiceRecord;
+import org.apache.hadoop.registry.client.types.yarn.YarnRegistryAttributes;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.BeforeClass;
+
+/**
+ * FSRegistryOperationsService test, using the local filesystem.
+ */
+public class TestFSRegistryOperationsService {
+  private static FSRegistryOperationsService registry =
+      new FSRegistryOperationsService();
+  private static FileSystem fs;
+
+  @BeforeClass
+  public static void initRegistry() throws IOException {
+    Assert.assertNotNull(registry);
+    registry.init(new Configuration());
+    fs = registry.getFs();
+    fs.delete(new Path("test"), true);
+  }
+
+  @Before
+  public void createTestDir() throws IOException {
+    fs.mkdirs(new Path("test"));
+  }
+
+  @After
+  public void cleanTestDir() throws IOException {
+    fs.delete(new Path("test"), true);
+  }
+
+  @Test
+  public void testMkNodeNonRecursive()
+      throws InvalidPathnameException, PathNotFoundException, IOException {
+    boolean result = false;
+    System.out.println("Make node with parent already made, nonrecursive");
+    result = registry.mknode("test/registryTestNode", false);
+    Assert.assertTrue(result);
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode")));
+
+    // Expected to fail
+    try {
+      System.out.println("Try to make node with no parent, nonrecursive");
+      registry.mknode("test/parent/registryTestNode", false);
+      Assert.fail("Should not have created node");
+    } catch (IOException e) {
+    }
+    Assert.assertFalse(fs.exists(new Path("test/parent/registryTestNode")));
+  }
+
+  @Test
+  public void testMkNodeRecursive() throws IOException {
+    boolean result = false;
+    System.out.println("Make node with parent already made, recursive");
+    result = registry.mknode("test/registryTestNode", true);
+    Assert.assertTrue(result);
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode")));
+
+    result = false;
+    System.out.println("Try to make node with no parent, recursive");
+    result = registry.mknode("test/parent/registryTestNode", true);
+    Assert.assertTrue(result);
+    Assert.assertTrue(fs.exists(new Path("test/parent/registryTestNode")));
+
+  }
+
+  @Test
+  public void testMkNodeAlreadyExists() throws IOException {
+    System.out.println("pre-create test path");
+    fs.mkdirs(new Path("test/registryTestNode"));
+
+    System.out.println(
+        "Try to mknode existing path -- should be noop and return false");
+    Assert.assertFalse(registry.mknode("test/registryTestNode", true));
+    Assert.assertFalse(registry.mknode("test/registryTestNode", false));
+  }
+
+  @Test
+  public void testBindParentPath() throws InvalidPathnameException,
+      PathNotFoundException, FileAlreadyExistsException, IOException {
+    ServiceRecord record = createRecord("0");
+
+    System.out.println("pre-create test path");
+    fs.mkdirs(new Path("test/parent1/registryTestNode"));
+
+    registry.bind("test/parent1/registryTestNode", record, 1);
+    Assert.assertTrue(
+        fs.exists(new Path("test/parent1/registryTestNode/_record")));
+
+    // Test without pre-creating path
+    registry.bind("test/parent2/registryTestNode", record, 1);
+    Assert.assertTrue(fs.exists(new Path("test/parent2/registryTestNode")));
+
+  }
+
+  @Test
+  public void testBindAlreadyExists() throws IOException {
+    ServiceRecord record1 = createRecord("1");
+    ServiceRecord record2 = createRecord("2");
+
+    System.out.println("Bind record1");
+    registry.bind("test/registryTestNode", record1, 1);
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/_record")));
+
+    System.out.println("Bind record2, overwrite = 1");
+    registry.bind("test/registryTestNode", record2, 1);
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/_record")));
+
+    // The record should have been overwritten
+    ServiceRecord readRecord = registry.resolve("test/registryTestNode");
+    Assert.assertTrue(readRecord.equals(record2));
+
+    System.out.println("Bind record3, overwrite = 0");
+    try {
+      registry.bind("test/registryTestNode", record1, 0);
+      Assert.fail("Should not overwrite record");
+    } catch (IOException e) {
+    }
+
+    // The record should not be overwritten
+    readRecord = registry.resolve("test/registryTestNode");
+    Assert.assertTrue(readRecord.equals(record2));
+  }
+
+  @Test
+  public void testResolve() throws IOException {
+    ServiceRecord record = createRecord("0");
+    registry.bind("test/registryTestNode", record, 1);
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/_record")));
+
+    System.out.println("Read record that exists");
+    ServiceRecord readRecord = registry.resolve("test/registryTestNode");
+    Assert.assertNotNull(readRecord);
+    Assert.assertTrue(record.equals(readRecord));
+
+    System.out.println("Try to read record that does not exist");
+    try {
+      readRecord = registry.resolve("test/nonExistentNode");
+      Assert.fail("Should throw an error, record does not exist");
+    } catch (IOException e) {
+    }
+  }
+
+  @Test
+  public void testExists() throws IOException {
+    System.out.println("pre-create test path");
+    fs.mkdirs(new Path("test/registryTestNode"));
+
+    System.out.println("Check for existing node");
+    boolean exists = registry.exists("test/registryTestNode");
+    Assert.assertTrue(exists);
+
+    System.out.println("Check for  non-existing node");
+    exists = registry.exists("test/nonExistentNode");
+    Assert.assertFalse(exists);
+  }
+
+  @Test
+  public void testDeleteDirsOnly() throws IOException {
+    System.out.println("pre-create test path with children");
+    fs.mkdirs(new Path("test/registryTestNode"));
+    fs.mkdirs(new Path("test/registryTestNode/child1"));
+    fs.mkdirs(new Path("test/registryTestNode/child2"));
+
+    try {
+      registry.delete("test/registryTestNode", false);
+      Assert.fail("Deleted dir wich children, nonrecursive flag set");
+    } catch (IOException e) {
+    }
+    // Make sure nothing was deleted
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode")));
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/child1")));
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/child2")));
+
+    System.out.println("Delete leaf path 'test/registryTestNode/child2'");
+    registry.delete("test/registryTestNode/child2", false);
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode")));
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/child1")));
+    Assert.assertFalse(fs.exists(new Path("test/registryTestNode/child2")));
+
+    System.out
+        .println("Recursively delete non-leaf path 'test/registryTestNode'");
+    registry.delete("test/registryTestNode", true);
+    Assert.assertFalse(fs.exists(new Path("test/registryTestNode")));
+  }
+
+  @Test
+  public void testDeleteWithRecords() throws IOException {
+    System.out.println("pre-create test path with children and mocked records");
+
+    fs.mkdirs(new Path("test/registryTestNode"));
+    fs.mkdirs(new Path("test/registryTestNode/child1"));
+    fs.mkdirs(new Path("test/registryTestNode/child2"));
+
+    // Create and close stream immediately so they aren't blocking
+    fs.create(new Path("test/registryTestNode/_record")).close();
+    fs.create(new Path("test/registryTestNode/child1/_record")).close();
+
+    System.out.println("Delete dir with child nodes and record file");
+    try {
+      registry.delete("test/registryTestNode", false);
+      Assert.fail("Nonrecursive delete of non-empty dir");
+    } catch (PathIsNotEmptyDirectoryException e) {
+    }
+
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/_record")));
+    Assert.assertTrue(
+        fs.exists(new Path("test/registryTestNode/child1/_record")));
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/child2")));
+
+    System.out.println("Delete dir with record file and no child dirs");
+    registry.delete("test/registryTestNode/child1", false);
+    Assert.assertFalse(fs.exists(new Path("test/registryTestNode/child1")));
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/child2")));
+
+    System.out.println("Delete dir with child dir and no record file");
+    try {
+      registry.delete("test/registryTestNode", false);
+      Assert.fail("Nonrecursive delete of non-empty dir");
+    } catch (PathIsNotEmptyDirectoryException e) {
+    }
+    Assert.assertTrue(fs.exists(new Path("test/registryTestNode/child2")));
+  }
+
+  @Test
+  public void testList() throws IOException {
+    System.out.println("pre-create test path with children and mocked records");
+
+    fs.mkdirs(new Path("test/registryTestNode"));
+    fs.mkdirs(new Path("test/registryTestNode/child1"));
+    fs.mkdirs(new Path("test/registryTestNode/child2"));
+
+    // Create and close stream immediately so they aren't blocking
+    fs.create(new Path("test/registryTestNode/_record")).close();
+    fs.create(new Path("test/registryTestNode/child1/_record")).close();
+
+    List<String> ls = null;
+
+    ls = registry.list("test/registryTestNode");
+    Assert.assertNotNull(ls);
+    Assert.assertEquals(2, ls.size());
+    System.out.println(ls);
+    Assert.assertTrue(ls.contains("child1"));
+    Assert.assertTrue(ls.contains("child2"));
+
+    ls = null;
+    ls = registry.list("test/registryTestNode/child1");
+    Assert.assertNotNull(ls);
+    Assert.assertTrue(ls.isEmpty());
+    ls = null;
+    ls = registry.list("test/registryTestNode/child2");
+    Assert.assertNotNull(ls);
+    Assert.assertTrue(ls.isEmpty());
+  }
+
+  private ServiceRecord createRecord(String id) {
+    System.out.println("Creating mock service record");
+
+    ServiceRecord record = new ServiceRecord();
+    record.set(YarnRegistryAttributes.YARN_ID, id);
+    record.description = "testRecord";
+    return record;
+  }
+}


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