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From ste...@apache.org
Subject hadoop git commit: YARN-4629. Distributed shell breaks under strong security. (Daniel Templeton via stevel)
Date Wed, 10 Feb 2016 13:01:32 GMT
Repository: hadoop
Updated Branches:
  refs/heads/branch-2 04ecce1ca -> 179b36efb


YARN-4629. Distributed shell breaks under strong security. (Daniel Templeton via stevel)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/179b36ef
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/179b36ef
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/179b36ef

Branch: refs/heads/branch-2
Commit: 179b36efb541114527ba4b695d3aed40d16aa4e4
Parents: 04ecce1
Author: Steve Loughran <stevel@apache.org>
Authored: Wed Feb 10 13:00:48 2016 +0000
Committer: Steve Loughran <stevel@apache.org>
Committed: Wed Feb 10 13:00:48 2016 +0000

----------------------------------------------------------------------
 hadoop-yarn-project/CHANGES.txt                 |   3 +
 .../applications/distributedshell/Client.java   |   3 +-
 .../yarn/client/util/YarnClientUtils.java       | 113 +++++++
 .../hadoop/yarn/client/util/package-info.java   |  20 ++
 .../yarn/client/util/TestYarnClientUtils.java   | 319 +++++++++++++++++++
 5 files changed, 457 insertions(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/179b36ef/hadoop-yarn-project/CHANGES.txt
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 338553c..83fd983 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -139,6 +139,9 @@ Release 2.9.0 - UNRELEASED
     YARN-4669. Fix logging statements in resource manager's Application class.
     (Seethana Sidharta via vvasudev)
 
+    YARN-4629. Distributed shell breaks under strong security.
+    (Daniel Templeton via stevel)
+
 Release 2.8.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

http://git-wip-us.apache.org/repos/asf/hadoop/blob/179b36ef/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/Client.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/Client.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/Client.java
index 68d2bde..e864ad2 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/Client.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/Client.java
@@ -74,6 +74,7 @@ import org.apache.hadoop.yarn.api.records.timeline.TimelineDomain;
 import org.apache.hadoop.yarn.client.api.TimelineClient;
 import org.apache.hadoop.yarn.client.api.YarnClient;
 import org.apache.hadoop.yarn.client.api.YarnClientApplication;
+import org.apache.hadoop.yarn.client.util.YarnClientUtils;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions.YarnException;
 import org.apache.hadoop.yarn.util.ConverterUtils;
@@ -669,7 +670,7 @@ public class Client {
     if (UserGroupInformation.isSecurityEnabled()) {
       // Note: Credentials class is marked as LimitedPrivate for HDFS and MapReduce
       Credentials credentials = new Credentials();
-      String tokenRenewer = conf.get(YarnConfiguration.RM_PRINCIPAL);
+      String tokenRenewer = YarnClientUtils.getRmPrincipal(conf);
       if (tokenRenewer == null || tokenRenewer.length() == 0) {
         throw new IOException(
           "Can't get Master Kerberos principal for the RM to use as renewer");

http://git-wip-us.apache.org/repos/asf/hadoop/blob/179b36ef/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/util/YarnClientUtils.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/util/YarnClientUtils.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/util/YarnClientUtils.java
new file mode 100644
index 0000000..1e3112a
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/util/YarnClientUtils.java
@@ -0,0 +1,113 @@
+/**
+ * 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.client.util;
+
+import com.google.common.annotations.VisibleForTesting;
+import java.io.IOException;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.security.SecurityUtil;
+import org.apache.hadoop.yarn.conf.HAUtil;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+
+/**
+ * This class is a container for utility methods that are useful when creating
+ * YARN clients.
+ */
+public abstract class YarnClientUtils {
+  /**
+   * Look up and return the resource manager's principal. This method
+   * automatically does the <code>_HOST</code> replacement in the principal and
+   * correctly handles HA resource manager configurations.
+   *
+   * @param conf the {@link Configuration} file from which to read the
+   * principal
+   * @return the resource manager's principal string or null if the
+   * {@link YarnConfiguration#RM_PRINCIPAL} property is not set in the
+   * {@code conf} parameter
+   * @throws IOException thrown if there's an error replacing the host name
+   */
+  public static String getRmPrincipal(Configuration conf) throws IOException {
+    String principal = conf.get(YarnConfiguration.RM_PRINCIPAL);
+    String prepared = null;
+
+    if (principal != null) {
+      prepared = getRmPrincipal(principal, conf);
+    }
+
+    return prepared;
+  }
+
+  /**
+   * Perform the <code>_HOST</code> replacement in the {@code principal},
+   * Returning the result. Correctly handles HA resource manager configurations.
+   *
+   * @param rmPrincipal the principal string to prepare
+   * @param conf the configuration
+   * @return the prepared principal string
+   * @throws IOException thrown if there's an error replacing the host name
+   */
+  public static String getRmPrincipal(String rmPrincipal, Configuration conf)
+      throws IOException {
+    if (rmPrincipal == null) {
+      throw new IllegalArgumentException("RM principal string is null");
+    }
+
+    if (HAUtil.isHAEnabled(conf)) {
+      conf = getYarnConfWithRmHaId(conf);
+    }
+
+    String hostname = conf.getSocketAddr(
+        YarnConfiguration.RM_ADDRESS,
+        YarnConfiguration.DEFAULT_RM_ADDRESS,
+        YarnConfiguration.DEFAULT_RM_PORT).getHostName();
+
+    return SecurityUtil.getServerPrincipal(rmPrincipal, hostname);
+  }
+
+  /**
+   * Returns a {@link YarnConfiguration} built from the {@code conf} parameter
+   * that is guaranteed to have the {@link YarnConfiguration#RM_HA_ID}
+   * property set.
+   *
+   * @param conf the base configuration
+   * @return a {@link YarnConfiguration} built from the base
+   * {@link Configuration}
+   * @throws IOException thrown if the {@code conf} parameter contains
+   * inconsistent properties
+   */
+  @VisibleForTesting
+  static YarnConfiguration getYarnConfWithRmHaId(Configuration conf)
+      throws IOException {
+    YarnConfiguration yarnConf = new YarnConfiguration(conf);
+
+    if (yarnConf.get(YarnConfiguration.RM_HA_ID) == null) {
+      // If RM_HA_ID is not configured, use the first of RM_HA_IDS.
+      // Any valid RM HA ID should work.
+      String[] rmIds = yarnConf.getStrings(YarnConfiguration.RM_HA_IDS);
+
+      if ((rmIds != null) && (rmIds.length > 0)) {
+        yarnConf.set(YarnConfiguration.RM_HA_ID, rmIds[0]);
+      } else {
+        throw new IOException("RM_HA_IDS property is not set for HA resource "
+            + "manager");
+      }
+    }
+
+    return yarnConf;
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/179b36ef/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/util/package-info.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/util/package-info.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/util/package-info.java
new file mode 100644
index 0000000..e7eaebe
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/util/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+@InterfaceAudience.Public
+package org.apache.hadoop.yarn.client.util;
+import org.apache.hadoop.classification.InterfaceAudience;

http://git-wip-us.apache.org/repos/asf/hadoop/blob/179b36ef/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/util/TestYarnClientUtils.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/util/TestYarnClientUtils.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/util/TestYarnClientUtils.java
new file mode 100644
index 0000000..42300a0
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/util/TestYarnClientUtils.java
@@ -0,0 +1,319 @@
+/**
+ * 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.client.util;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map.Entry;
+import java.util.Set;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+/**
+ * Tests for the YarnClientUtils class
+ */
+public class TestYarnClientUtils {
+  /**
+   * Test of getRMPrincipal(Configuration) method, of class YarnClientUtils
+   * when HA is not enabled.
+   *
+   * @throws java.io.IOException thrown if stuff breaks
+   */
+  @Test
+  public void testGetRMPrincipalStandAlone_Configuration() throws IOException {
+    Configuration conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS, "myhost");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, false);
+
+    String result = YarnClientUtils.getRmPrincipal(conf);
+
+    assertNull("The hostname translation did return null when the principal is "
+        + "missing from the conf: " + result, result);
+
+    conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS, "myhost");
+    conf.set(YarnConfiguration.RM_PRINCIPAL, "test/_HOST@REALM");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, false);
+
+    result = YarnClientUtils.getRmPrincipal(conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/myhost@REALM", result);
+
+    conf.set(YarnConfiguration.RM_PRINCIPAL, "test/yourhost@REALM");
+
+    result = YarnClientUtils.getRmPrincipal(conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/yourhost@REALM", result);
+  }
+
+  /**
+   * Test of getRMPrincipal(Configuration) method, of class YarnClientUtils
+   * when HA is enabled.
+   *
+   * @throws java.io.IOException thrown if stuff breaks
+   */
+  @Test
+  public void testGetRMPrincipalHA_Configuration() throws IOException {
+    Configuration conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS, "myhost");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+
+    String result = YarnClientUtils.getRmPrincipal(conf);
+
+    assertNull("The hostname translation did return null when the principal is "
+        + "missing from the conf: " + result, result);
+
+    conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS + ".rm0", "myhost");
+    conf.set(YarnConfiguration.RM_PRINCIPAL, "test/_HOST@REALM");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+    conf.set(YarnConfiguration.RM_HA_IDS, "rm0");
+
+    result = YarnClientUtils.getRmPrincipal(conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/myhost@REALM", result);
+
+    conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS + ".rm0", "myhost");
+    conf.set(YarnConfiguration.RM_PRINCIPAL, "test/_HOST@REALM");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+
+    try {
+      result = YarnClientUtils.getRmPrincipal(conf);
+      fail("The hostname translation succeeded even though no RM ids were "
+          + "set: " + result);
+    } catch (IOException ex) {
+      // Expected
+    }
+
+    conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS + ".rm0", "myhost");
+    conf.set(YarnConfiguration.RM_PRINCIPAL, "test/_HOST@REALM");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+    conf.set(YarnConfiguration.RM_HA_ID, "rm0");
+
+    result = YarnClientUtils.getRmPrincipal(conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/myhost@REALM", result);
+
+    conf.set(YarnConfiguration.RM_PRINCIPAL, "test/yourhost@REALM");
+
+    result = YarnClientUtils.getRmPrincipal(conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/yourhost@REALM", result);
+  }
+
+  /**
+   * Test of getRMPrincipal(Configuration) method, of class YarnClientUtils
+   * when HA is not enabled.
+   *
+   * @throws java.io.IOException thrown if stuff breaks
+   */
+  @Test
+  public void testGetRMPrincipalStandAlone_String() throws IOException {
+    Configuration conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS, "myhost");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, false);
+
+    String result = YarnClientUtils.getRmPrincipal("test/_HOST@REALM", conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/myhost@REALM", result);
+
+    result = YarnClientUtils.getRmPrincipal("test/yourhost@REALM", conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/yourhost@REALM", result);
+
+    try {
+      result = YarnClientUtils.getRmPrincipal(null, conf);
+      fail("The hostname translation succeeded even though the RM principal "
+          + "was null: " + result);
+    } catch (IllegalArgumentException ex) {
+      // Expected
+    }
+  }
+
+  /**
+   * Test of getRMPrincipal(Configuration) method, of class YarnClientUtils
+   * when HA is enabled.
+   *
+   * @throws java.io.IOException thrown if stuff breaks
+   */
+  @Test
+  public void testGetRMPrincipalHA_String() throws IOException {
+    Configuration conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS + ".rm0", "myhost");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+    conf.set(YarnConfiguration.RM_HA_IDS, "rm0");
+
+    String result = YarnClientUtils.getRmPrincipal("test/_HOST@REALM", conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/myhost@REALM", result);
+
+    try {
+      result = YarnClientUtils.getRmPrincipal(null, conf);
+      fail("The hostname translation succeeded even though the RM principal "
+          + "was null: " + result);
+    } catch (IllegalArgumentException ex) {
+      // Expected
+    }
+
+    conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS + ".rm0", "myhost");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+
+    try {
+      YarnClientUtils.getRmPrincipal("test/_HOST@REALM", conf);
+      fail("The hostname translation succeeded even though no RM ids were set");
+    } catch (IOException ex) {
+      // Expected
+    }
+
+    conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_ADDRESS + ".rm0", "myhost");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+    conf.set(YarnConfiguration.RM_HA_ID, "rm0");
+
+    result = YarnClientUtils.getRmPrincipal("test/_HOST@REALM", conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/myhost@REALM", result);
+
+    result = YarnClientUtils.getRmPrincipal("test/yourhost@REALM", conf);
+
+    assertEquals("The hostname translation did not produce the expected "
+        + "results: " + result, "test/yourhost@REALM", result);
+  }
+
+  /**
+   * Test of getRMPrincipal method of class YarnClientUtils.
+   *
+   * @throws IOException thrown when something breaks
+   */
+  @Test
+  public void testGetYarnConfWithRmHaId() throws IOException {
+    Configuration conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_HA_ID, "rm0");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, false);
+
+    YarnConfiguration result = YarnClientUtils.getYarnConfWithRmHaId(conf);
+
+    assertSameConf(conf, result);
+    assertEquals("RM_HA_ID was changed when it shouldn't have been: "
+        + result.get(YarnConfiguration.RM_HA_ID), "rm0",
+        result.get(YarnConfiguration.RM_HA_ID));
+
+    conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_HA_ID, "rm0");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+
+    result = YarnClientUtils.getYarnConfWithRmHaId(conf);
+
+    assertSameConf(conf, result);
+    assertEquals("RM_HA_ID was changed when it shouldn't have been: "
+        + result.get(YarnConfiguration.RM_HA_ID), "rm0",
+        result.get(YarnConfiguration.RM_HA_ID));
+
+    conf = new Configuration();
+
+    conf.set(YarnConfiguration.RM_HA_IDS, "rm0,rm1");
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+
+    result = YarnClientUtils.getYarnConfWithRmHaId(conf);
+
+    assertSameConf(conf, result);
+    assertEquals("RM_HA_ID was not set correctly: "
+         + result.get(YarnConfiguration.RM_HA_ID), "rm0",
+         result.get(YarnConfiguration.RM_HA_ID));
+
+    conf = new Configuration();
+
+    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
+
+    try {
+      YarnClientUtils.getYarnConfWithRmHaId(conf);
+      fail("Allowed invalid HA configuration: HA is enabled, but no RM ID "
+          + "is set");
+    } catch (IOException ex) {
+      // Expected
+    }
+  }
+
+  /**
+   * Compare two configurations to see that they both have the same values.
+   * The YarnConfiguration.RM_HA_ID property is ignored, as it as expected to
+   * change and be tested external to this method.
+   *
+   * @param master the master Configuration
+   * @param copy the copy Configuration
+   */
+  private void assertSameConf(Configuration master, YarnConfiguration copy) {
+    Set<String> seen = new HashSet<>();
+    Iterator<Entry<String, String>> itr = master.iterator();
+
+    // Always ignore the RM_HA_ID, because we expect it to change
+    seen.add(YarnConfiguration.RM_HA_ID);
+
+    while (itr.hasNext()) {
+      Entry<String, String> property = itr.next();
+      String key = property.getKey();
+
+      if (!seen.add(key)) {
+        // Here we use master.get() instead of property.getValue() because
+        // they're not the same thing.
+        assertEquals("New configuration changed the value of "
+            + key, master.get(key), copy.get(key));
+      }
+    }
+
+    itr = copy.iterator();
+
+    while (itr.hasNext()) {
+      Entry<String, String> property = itr.next();
+      String key = property.getKey();
+
+      if (!seen.contains(property.getKey())) {
+        assertEquals("New configuration changed the value of "
+            + key, copy.get(key),
+            master.get(key));
+      }
+    }
+  }
+}


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