[GitHub] [ozone] adoroszlai commented on a change in pull request #2425: HDDS-5456. Inject a Clock into Replication Manager to allow timeouts to be tested

[GitBox <gi...@apache.org>]

adoroszlai commented on a change in pull request #2425:
URL: https://github.com/apache/ozone/pull/2425#discussion_r671806158



##########
File path: hadoop-hdds/common/src/main/java/org/apache/hadoop/ozone/common/MonotonicClock.java
##########
@@ -0,0 +1,81 @@
+/*
+ * 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.ozone.common;
+
+import org.apache.hadoop.util.Time;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.time.ZoneId;
+
+/**
+ * This is a class which implements the Clock interface. It is a copy of the
+ * Java Clock.SystemClock only it uses MonotonicNow (nanotime) rather than
+ * System.currentTimeMills.
+ */
+
+public class MonotonicClock extends Clock {
+
+  private final ZoneId zoneId;
+
+  public MonotonicClock(ZoneId zone) {
+    this.zoneId = zone;
+  }
+
+  @Override
+  public ZoneId getZone() {
+    return zoneId;
+  }
+
+  @Override
+  public Clock withZone(ZoneId zone) {
+    if (zone.equals(this.zoneId)) {  // intentional NPE
+      return this;
+    }
+    return new MonotonicClock(zone);
+  }
+
+  @Override
+  public long millis() {
+    return Time.monotonicNow();
+  }
+
+  @Override
+  public Instant instant() {
+    return Instant.ofEpochMilli(millis());
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (obj instanceof MonotonicClock) {
+      return zoneId.equals(((MonotonicClock) obj).zoneId);

Review comment:
       `MonotonicClock` should be `final` or `equals` should check class equality instead of `instanceof`.  Otherwise equality of instances of a subclass and `MonotonicClock` would not be symmetric.

##########
File path: hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/server/StorageContainerManager.java
##########
@@ -600,7 +602,8 @@ private void initializeSystemManagers(OzoneConfiguration conf,
           eventQueue,
           scmContext,
           serviceManager,
-          scmNodeManager);
+          scmNodeManager,
+          new MonotonicClock(ZoneId.of("UTC")));

Review comment:
       Is there any reason not to use `ZoneOffset.UTC`?




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