YARN-8856. TestTimelineReaderWebServicesHBaseStorage tests failing with NoClassDefFoundError. Contributed by Sushil Ks.

(cherry picked from commit eeaf8edaa7)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/pom.xml

@@ -317,6 +317,13 @@
       <scope>test</scope>
     </dependency>
 
+    <dependency>
+      <groupId>org.jmockit</groupId>
+      <artifactId>jmockit</artifactId>
+      <version>1.24</version>
+      <scope>test</scope>
+    </dependency>
+
     <dependency>
       <groupId>org.apache.hbase</groupId>
       <artifactId>hbase-testing-util</artifactId>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/reader/DummyTimelineReaderMetrics.java

@@ -0,0 +1,39 @@
+/**
+ * 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.timelineservice.reader;
+
+import org.apache.hadoop.yarn.server.timelineservice.metrics.TimelineReaderMetrics;
+
+/**
+ * DummyTimelineReaderMetrics for mocking {@link TimelineReaderMetrics} calls.
+ */
+public class DummyTimelineReaderMetrics extends TimelineReaderMetrics {
+
+
+  @Override
+  public void addGetEntitiesLatency(
+      long durationMs, boolean succeeded) {
+
+  }
+
+  @Override
+  public void addGetEntityTypesLatency(
+      long durationMs, boolean succeeded) {
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/reader/TestTimelineReaderWebServicesHBaseStorage.java

@@ -35,6 +35,8 @@ import java.util.Set;
 
 import javax.ws.rs.core.MediaType;
 
+import mockit.Mock;
+import mockit.MockUp;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
@@ -50,6 +52,7 @@ import org.apache.hadoop.yarn.api.records.timelineservice.TimelineMetric;
 import org.apache.hadoop.yarn.api.records.timelineservice.TimelineMetric.Type;
 import org.apache.hadoop.yarn.server.metrics.ApplicationMetricsConstants;
 import org.apache.hadoop.yarn.server.timelineservice.collector.TimelineCollectorContext;
+import org.apache.hadoop.yarn.server.timelineservice.metrics.TimelineReaderMetrics;
 import org.apache.hadoop.yarn.server.timelineservice.storage.HBaseTimelineWriterImpl;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.HBaseTimelineSchemaUtils;
 import org.apache.hadoop.yarn.server.utils.BuilderUtils;
@@ -73,9 +76,17 @@ public class TestTimelineReaderWebServicesHBaseStorage
   private static long dayTs =
       HBaseTimelineSchemaUtils.getTopOfTheDayTimestamp(ts);
   private static String doAsUser = "remoteuser";
+  private static final DummyTimelineReaderMetrics METRICS
+      = new DummyTimelineReaderMetrics();
 
   @BeforeClass
   public static void setupBeforeClass() throws Exception {
+    new MockUp<TimelineReaderMetrics>() {
+      @Mock
+      public TimelineReaderMetrics getInstance() {
+        return METRICS;
+      }
+    };
     setup();
     loadData();
     initialize();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/metrics/TimelineReaderMetrics.java

@@ -33,7 +33,7 @@ import static org.apache.hadoop.metrics2.lib.Interns.info;
  * Metrics class for TimelineReader.
  */
 @Metrics(about = "Metrics for timeline reader", context = "timelineservice")
-final public class TimelineReaderMetrics {
+public class TimelineReaderMetrics {
 
   private final static MetricsInfo METRICS_INFO = info("TimelineReaderMetrics",
       "Metrics for TimelineReader");
@@ -50,7 +50,8 @@ final public class TimelineReaderMetrics {
   @Metric(about = "GET entity types success latency", valueName = "latency")
   private MutableQuantiles getEntityTypesSuccessLatency;
 
-  private TimelineReaderMetrics() {
+  @VisibleForTesting
+  protected TimelineReaderMetrics() {
   }
 
   public static TimelineReaderMetrics getInstance() {