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From templ...@apache.org
Subject hadoop git commit: YARN-6125. The application attempt's diagnostic message should have a maximum size (Contributed by Andras Piros via Daniel Templeton)
Date Fri, 17 Feb 2017 21:44:12 GMT
Repository: hadoop
Updated Branches:
  refs/heads/trunk 9a9283778 -> c7a36e613


YARN-6125. The application attempt's diagnostic message should have a maximum size
(Contributed by Andras Piros via Daniel Templeton)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/c7a36e61
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/c7a36e61
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/c7a36e61

Branch: refs/heads/trunk
Commit: c7a36e613053ec8b111146004b887c2f13535469
Parents: 9a92837
Author: Daniel Templeton <templedf@apache.org>
Authored: Fri Feb 17 13:40:58 2017 -0800
Committer: Daniel Templeton <templedf@apache.org>
Committed: Fri Feb 17 13:40:58 2017 -0800

----------------------------------------------------------------------
 .../hadoop/yarn/conf/YarnConfiguration.java     |   5 +
 .../src/main/resources/yarn-default.xml         |  15 ++
 .../hadoop-yarn-server-resourcemanager/pom.xml  |  16 +-
 .../rmapp/attempt/RMAppAttemptImpl.java         | 172 ++++++++++++++++++-
 .../rmapp/attempt/TestBoundedAppender.java      | 116 +++++++++++++
 .../TestRMAppAttemptImplDiagnostics.java        | 111 ++++++++++++
 6 files changed, 422 insertions(+), 13 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/c7a36e61/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
index 136227a..094a424 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java
@@ -2619,6 +2619,11 @@ public class YarnConfiguration extends Configuration {
 
   public static final int DEFAULT_CLUSTER_LEVEL_APPLICATION_PRIORITY = 0;
 
+  public static final String APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC =
+      YARN_PREFIX + "app.attempt.diagnostics.limit.kc";
+
+  public static final int DEFAULT_APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC = 64;
+
   @Private
   public static boolean isDistributedNodeLabelConfiguration(Configuration conf) {
     return DISTRIBUTED_NODELABEL_CONFIGURATION_TYPE.equals(conf.get(

http://git-wip-us.apache.org/repos/asf/hadoop/blob/c7a36e61/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
index 4ca46f9..53beb5e 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml
@@ -3022,4 +3022,19 @@
     <value>3000</value>
   </property>
 
+  <property>
+    <description>
+      Defines the limit of the diagnostics message of an application
+      attempt, in kilo characters (character count * 1024).
+      When using ZooKeeper to store application state behavior, it's
+      important to limit the size of the diagnostic messages to
+      prevent YARN from overwhelming ZooKeeper. In cases where
+      yarn.resourcemanager.state-store.max-completed-applications is set to
+      a large number, it may be desirable to reduce the value of this property
+      to limit the total data stored.
+    </description>
+    <name>yarn.app.attempt.diagnostics.limit.kc</name>
+    <value>64</value>
+  </property>
+
 </configuration>

http://git-wip-us.apache.org/repos/asf/hadoop/blob/c7a36e61/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/pom.xml
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/pom.xml
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/pom.xml
index 6985d65..0a85d0c 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/pom.xml
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/pom.xml
@@ -52,8 +52,17 @@
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-annotations</artifactId>
     </dependency>
+    <!--
+    junit must be before mockito-all on the classpath.  mockito-all bundles its
+    own copy of the hamcrest classes, but they don't match our junit version.
+    -->
     <dependency>
-      <groupId>org.mockito</groupId>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+    <groupId>org.mockito</groupId>
       <artifactId>mockito-all</artifactId>
       <scope>test</scope>
     </dependency>
@@ -73,11 +82,6 @@
       <artifactId>protobuf-java</artifactId>
     </dependency>
     <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
     </dependency>

http://git-wip-us.apache.org/repos/asf/hadoop/blob/c7a36e61/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptImpl.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptImpl.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptImpl.java
index 1788722..25138c5 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptImpl.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/RMAppAttemptImpl.java
@@ -38,6 +38,7 @@ import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
 
 import javax.crypto.SecretKey;
 
+import com.google.common.base.Preconditions;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -119,6 +120,8 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
       "%s State change from %s to %s on event = %s";
   private static final String RECOVERY_MESSAGE =
       "Recovering attempt: %s with final state = %s";
+  private static final String DIAGNOSTIC_LIMIT_CONFIG_ERROR_MESSAGE =
+      "The value of %s should be a positive integer: %s";
 
   private static final Log LOG = LogFactory.getLog(RMAppAttemptImpl.class);
 
@@ -127,6 +130,7 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
 
   public final static Priority AM_CONTAINER_PRIORITY = recordFactory
       .newRecordInstance(Priority.class);
+
   static {
     AM_CONTAINER_PRIORITY.setPriority(0);
   }
@@ -171,7 +175,7 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
   // Set to null initially. Will eventually get set
   // if an RMAppAttemptUnregistrationEvent occurs
   private FinalApplicationStatus finalStatus = null;
-  private final StringBuilder diagnostics = new StringBuilder();
+  private final BoundedAppender diagnostics;
   private int amContainerExitStatus = ContainerExitStatus.INVALID;
 
   private Configuration conf;
@@ -518,6 +522,45 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
 
     this.amReq = amReq;
     this.blacklistedNodesForAM = amBlacklistManager;
+
+    final int diagnosticsLimitKC = getDiagnosticsLimitKCOrThrow(conf);
+
+    if (LOG.isDebugEnabled()) {
+      LOG.debug(YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC + " : " +
+              diagnosticsLimitKC);
+    }
+
+    this.diagnostics = new BoundedAppender(diagnosticsLimitKC * 1024);
+  }
+
+  private int getDiagnosticsLimitKCOrThrow(final Configuration configuration) {
+    try {
+      final int diagnosticsLimitKC = configuration.getInt(
+          YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC,
+          YarnConfiguration.DEFAULT_APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC);
+
+      if (diagnosticsLimitKC <= 0) {
+        final String message =
+            String.format(DIAGNOSTIC_LIMIT_CONFIG_ERROR_MESSAGE,
+                YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC,
+                diagnosticsLimitKC);
+        LOG.error(message);
+
+        throw new YarnRuntimeException(message);
+      }
+
+      return diagnosticsLimitKC;
+    } catch (final NumberFormatException ignored) {
+      final String diagnosticsLimitKCString = configuration
+          .get(YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC);
+      final String message =
+          String.format(DIAGNOSTIC_LIMIT_CONFIG_ERROR_MESSAGE,
+              YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC,
+              diagnosticsLimitKCString);
+      LOG.error(message);
+
+      throw new YarnRuntimeException(message);
+    }
   }
 
   @Override
@@ -738,6 +781,11 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
     }
   }
 
+  @VisibleForTesting
+  void appendDiagnostics(final CharSequence message) {
+    this.diagnostics.append(message);
+  }
+
   public int getAMContainerExitStatus() {
     this.readLock.lock();
     try {
@@ -926,8 +974,8 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
           attemptState.getState()));
     }
 
-    diagnostics.append("Attempt recovered after RM restart");
-    diagnostics.append(attemptState.getDiagnostics());
+    this.diagnostics.append("Attempt recovered after RM restart");
+    this.diagnostics.append(attemptState.getDiagnostics());
     this.amContainerExitStatus = attemptState.getAMContainerExitStatus();
     if (amContainerExitStatus == ContainerExitStatus.PREEMPTED) {
       this.attemptMetrics.setIsPreempted();
@@ -942,7 +990,7 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
     this.startTime = attemptState.getStartTime();
     this.finishTime = attemptState.getFinishTime();
     this.attemptMetrics.updateAggregateAppResourceUsage(
-        attemptState.getMemorySeconds(),attemptState.getVcoreSeconds());
+        attemptState.getMemorySeconds(), attemptState.getVcoreSeconds());
     this.attemptMetrics.updateAggregatePreemptedAppResourceUsage(
         attemptState.getPreemptedMemorySeconds(),
         attemptState.getPreemptedVcoreSeconds());
@@ -1655,8 +1703,7 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
   private void setAMContainerCrashedDiagnosticsAndExitStatus(
       RMAppAttemptContainerFinishedEvent finishEvent) {
     ContainerStatus status = finishEvent.getContainerStatus();
-    String diagnostics = getAMContainerCrashedDiagnostics(finishEvent);
-    this.diagnostics.append(diagnostics);
+    this.diagnostics.append(getAMContainerCrashedDiagnostics(finishEvent));
     this.amContainerExitStatus = status.getExitStatus();
   }
 
@@ -1825,7 +1872,7 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable {
     progress = 1.0f;
     RMAppAttemptUnregistrationEvent unregisterEvent =
         (RMAppAttemptUnregistrationEvent) event;
-    diagnostics.append(unregisterEvent.getDiagnosticMsg());
+    this.diagnostics.append(unregisterEvent.getDiagnosticMsg());
     originalTrackingUrl = sanitizeTrackingUrl(unregisterEvent.getFinalTrackingUrl());
     finalStatus = unregisterEvent.getFinalApplicationStatus();
   }
@@ -2232,4 +2279,115 @@ public class RMAppAttemptImpl implements RMAppAttempt, Recoverable
{
     }
     return Collections.EMPTY_SET;
   }
+
+  /**
+   * A {@link CharSequence} appender that considers its {@link #limit} as upper
+   * bound.
+   * <p>
+   * When {@link #limit} would be reached on append, past messages will be
+   * truncated from head, and a header telling the user about truncation will be
+   * prepended, with ellipses in between header and messages.
+   * <p>
+   * Note that header and ellipses are not counted against {@link #limit}.
+   * <p>
+   * An example:
+   *
+   * <pre>
+   * {@code
+   *   // At the beginning it's an empty string
+   *   final Appendable shortAppender = new BoundedAppender(80);
+   *   // The whole message fits into limit
+   *   shortAppender.append(
+   *       "message1 this is a very long message but fitting into limit\n");
+   *   // The first message is truncated, the second not
+   *   shortAppender.append("message2 this is shorter than the previous one\n");
+   *   // The first message is deleted, the second truncated, the third
+   *   // preserved
+   *   shortAppender.append("message3 this is even shorter message, maybe.\n");
+   *   // The first two are deleted, the third one truncated, the last preserved
+   *   shortAppender.append("message4 the shortest one, yet the greatest :)");
+   *   // Current contents are like this:
+   *   // Diagnostic messages truncated, showing last 80 chars out of 199:
+   *   // ...s is even shorter message, maybe.
+   *   // message4 the shortest one, yet the greatest :)
+   * }
+   * </pre>
+   * <p>
+   * Note that <tt>null</tt> values are {@link #append(CharSequence) append}ed
+   * just like in {@link StringBuilder#append(CharSequence) original
+   * implementation}.
+   * <p>
+   * Note that this class is not thread safe.
+   */
+  @VisibleForTesting
+  static class BoundedAppender {
+    @VisibleForTesting
+    static final String TRUNCATED_MESSAGES_TEMPLATE =
+        "Diagnostic messages truncated, showing last "
+            + "%d chars out of %d:%n...%s";
+
+    private final int limit;
+    private final StringBuilder messages = new StringBuilder();
+    private int totalCharacterCount = 0;
+
+    BoundedAppender(final int limit) {
+      Preconditions.checkArgument(limit > 0, "limit should be positive");
+
+      this.limit = limit;
+    }
+
+    /**
+     * Append a {@link CharSequence} considering {@link #limit}, truncating
+     * from the head of {@code csq} or {@link #messages} when necessary.
+     *
+     * @param csq the {@link CharSequence} to append
+     * @return this
+     */
+    BoundedAppender append(final CharSequence csq) {
+      appendAndCount(csq);
+      checkAndCut();
+
+      return this;
+    }
+
+    private void appendAndCount(final CharSequence csq) {
+      final int before = messages.length();
+      messages.append(csq);
+      final int after = messages.length();
+      totalCharacterCount += after - before;
+    }
+
+    private void checkAndCut() {
+      if (messages.length() > limit) {
+        final int newStart = messages.length() - limit;
+        messages.delete(0, newStart);
+      }
+    }
+
+    /**
+     * Get current length of messages considering truncates
+     * without header and ellipses.
+     *
+     * @return current length
+     */
+    int length() {
+      return messages.length();
+    }
+
+    /**
+     * Get a string representation of the actual contents, displaying also a
+     * header and ellipses when there was a truncate.
+     *
+     * @return String representation of the {@link #messages}
+     */
+    @Override
+    public String toString() {
+      if (messages.length() < totalCharacterCount) {
+        return String.format(TRUNCATED_MESSAGES_TEMPLATE, messages.length(),
+            totalCharacterCount, messages.toString());
+      }
+
+      return messages.toString();
+    }
+  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/c7a36e61/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestBoundedAppender.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestBoundedAppender.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestBoundedAppender.java
new file mode 100644
index 0000000..9cb1e04
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestBoundedAppender.java
@@ -0,0 +1,116 @@
+/**
+ * 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.server.resourcemanager.rmapp.attempt;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.junit.Assert.assertEquals;
+import static org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.BoundedAppender;
+
+/**
+ * Test class for {@link BoundedAppender}.
+ */
+public class TestBoundedAppender {
+  @Rule
+  public ExpectedException expected = ExpectedException.none();
+
+  @Test
+  public void initWithZeroLimitThrowsException() {
+    expected.expect(IllegalArgumentException.class);
+    expected.expectMessage("limit should be positive");
+
+    new BoundedAppender(0);
+  }
+
+  @Test
+  public void nullAppendedNullStringRead() {
+    final BoundedAppender boundedAppender = new BoundedAppender(4);
+    boundedAppender.append(null);
+
+    assertEquals("null appended, \"null\" read", "null",
+        boundedAppender.toString());
+  }
+
+  @Test
+  public void appendBelowLimitOnceValueIsReadCorrectly() {
+    final BoundedAppender boundedAppender = new BoundedAppender(2);
+
+    boundedAppender.append("ab");
+
+    assertEquals("value appended is read correctly", "ab",
+        boundedAppender.toString());
+  }
+
+  @Test
+  public void appendValuesBelowLimitAreReadCorrectlyInFifoOrder() {
+    final BoundedAppender boundedAppender = new BoundedAppender(3);
+
+    boundedAppender.append("ab");
+    boundedAppender.append("cd");
+    boundedAppender.append("e");
+    boundedAppender.append("fg");
+
+    assertEquals("last values appended fitting limit are read correctly",
+        String.format(BoundedAppender.TRUNCATED_MESSAGES_TEMPLATE, 3, 7, "efg"),
+        boundedAppender.toString());
+  }
+
+  @Test
+  public void appendLastAboveLimitPreservesLastMessagePostfix() {
+    final BoundedAppender boundedAppender = new BoundedAppender(3);
+
+    boundedAppender.append("ab");
+    boundedAppender.append("cde");
+    boundedAppender.append("fghij");
+
+    assertEquals(
+        "last value appended above limit postfix is read correctly", String
+            .format(BoundedAppender.TRUNCATED_MESSAGES_TEMPLATE, 3, 10, "hij"),
+        boundedAppender.toString());
+  }
+
+  @Test
+  public void appendMiddleAboveLimitPreservesLastMessageAndMiddlePostfix() {
+    final BoundedAppender boundedAppender = new BoundedAppender(3);
+
+    boundedAppender.append("ab");
+    boundedAppender.append("cde");
+
+    assertEquals("last value appended above limit postfix is read correctly",
+        String.format(BoundedAppender.TRUNCATED_MESSAGES_TEMPLATE, 3, 5, "cde"),
+        boundedAppender.toString());
+
+    boundedAppender.append("fg");
+
+    assertEquals(
+        "middle value appended above limit postfix and last value are "
+            + "read correctly",
+        String.format(BoundedAppender.TRUNCATED_MESSAGES_TEMPLATE, 3, 7, "efg"),
+        boundedAppender.toString());
+
+    boundedAppender.append("hijkl");
+
+    assertEquals(
+        "last value appended above limit postfix is read correctly", String
+            .format(BoundedAppender.TRUNCATED_MESSAGES_TEMPLATE, 3, 12, "jkl"),
+        boundedAppender.toString());
+  }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/hadoop/blob/c7a36e61/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestRMAppAttemptImplDiagnostics.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestRMAppAttemptImplDiagnostics.java
b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestRMAppAttemptImplDiagnostics.java
new file mode 100644
index 0000000..a160eb8
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/attempt/TestRMAppAttemptImplDiagnostics.java
@@ -0,0 +1,111 @@
+/**
+ * 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.server.resourcemanager.rmapp.attempt;
+
+import org.apache.commons.lang.RandomStringUtils;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
+import org.apache.hadoop.yarn.api.records.ApplicationId;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.event.Dispatcher;
+import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
+import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * Testing {@link RMAppAttemptImpl#diagnostics} scenarios.
+ */
+public class TestRMAppAttemptImplDiagnostics {
+
+  @Rule
+  public ExpectedException expectedException = ExpectedException.none();
+
+  @Test
+  public void whenCreatedWithDefaultConfigurationSuccess() {
+    final Configuration configuration = new Configuration();
+    configuration.setInt(YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC,
+        YarnConfiguration.DEFAULT_APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC);
+
+    createRMAppAttemptImpl(configuration);
+  }
+
+  @Test
+  public void whenCreatedWithWrongConfigurationError() {
+    final Configuration configuration = new Configuration();
+    configuration.setInt(YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC, 0);
+
+    expectedException.expect(YarnRuntimeException.class);
+
+    createRMAppAttemptImpl(configuration);
+  }
+
+  @Test
+  public void whenAppendedWithinLimitMessagesArePreserved() {
+    final Configuration configuration = new Configuration();
+    configuration.setInt(YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC, 1);
+
+    final RMAppAttemptImpl appAttempt = createRMAppAttemptImpl(configuration);
+
+    final String withinLimit = RandomStringUtils.random(1024);
+    appAttempt.appendDiagnostics(withinLimit);
+
+    assertEquals("messages within limit should be preserved", withinLimit,
+        appAttempt.getDiagnostics());
+  }
+
+  @Test
+  public void whenAppendedBeyondLimitMessagesAreTruncated() {
+    final Configuration configuration = new Configuration();
+    configuration.setInt(YarnConfiguration.APP_ATTEMPT_DIAGNOSTICS_LIMIT_KC, 1);
+
+    final RMAppAttemptImpl appAttempt = createRMAppAttemptImpl(configuration);
+
+    final String beyondLimit = RandomStringUtils.random(1025);
+    appAttempt.appendDiagnostics(beyondLimit);
+
+    final String truncated = String.format(
+        RMAppAttemptImpl.BoundedAppender.TRUNCATED_MESSAGES_TEMPLATE, 1024,
+        1025, beyondLimit.substring(1));
+
+    assertEquals("messages beyond limit should be truncated", truncated,
+        appAttempt.getDiagnostics());
+  }
+
+  private RMAppAttemptImpl createRMAppAttemptImpl(
+      final Configuration configuration) {
+    final ApplicationAttemptId mockApplicationAttemptId =
+        mock(ApplicationAttemptId.class);
+    final ApplicationId mockApplicationId = mock(ApplicationId.class);
+    when(mockApplicationAttemptId.getApplicationId())
+        .thenReturn(mockApplicationId);
+
+    final RMContext mockRMContext = mock(RMContext.class);
+    final Dispatcher mockDispatcher = mock(Dispatcher.class);
+    when(mockRMContext.getDispatcher()).thenReturn(mockDispatcher);
+
+    return new RMAppAttemptImpl(mockApplicationAttemptId, mockRMContext, null,
+        null, null, configuration, false, null);
+  }
+}
\ No newline at end of file


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