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From GitBox <...@apache.org>
Subject [GitHub] [giraph] dlogothetis commented on a change in pull request #110: Counter Mechanism
Date Fri, 08 Nov 2019 03:14:00 GMT
dlogothetis commented on a change in pull request #110: Counter Mechanism
URL: https://github.com/apache/giraph/pull/110#discussion_r343957870
 
 

 ##########
 File path: giraph-core/src/main/java/org/apache/giraph/counters/CustomCounters.java
 ##########
 @@ -0,0 +1,128 @@
+/*
+ * 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.giraph.counters;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Custom counters created by the client or app
+ * Stores the names of the counters, and the final aggregated values
+ * Since there is no way to get the list of available counters from the context,
+ * we need to call addCustomCounter to store the information about the list of
+ * available counters. This is accessed by the worker/master to fetch the
+ * final counter values based on the group and counter name.
+ * It is assumed that whenever a counter is created, addCustomCounter is called,
+ * to enable aggregations on that counter, using the Giraph mechanism for
+ * aggregating counters.
+ */
+public class CustomCounters {
+
+
+
+  /** Unique counter groups and names populated during execution of the job
+   * Since multiple threads can access this variable to perform read/write
+   * operations, we use a ConcurrentHashMap.newKeySet() to
+   * establish synchronisation */
+  private static Set<CustomCounter> COUNTER_NAMES =
+          ConcurrentHashMap.newKeySet();
+
+  /** Aggregated counter values updated by master */
+  private final List<CustomCounter> counterList;
+
+  /**
+   * Create custom counters
+   */
+  public CustomCounters() {
+    counterList = new ArrayList<>();
+  }
+
+  /**
+   * Add a counter group and name to the custom counters
+   * If it already exists, then it will not be added
+   * This will be called from the application to add the app-specific counters
+   *
+   * @param groupName Counter group
+   * @param counterName Counter name
+   * @param aggregation Type of aggregation for the counter
+   */
+  public static void addCustomCounter(String groupName, String counterName,
+                                      CustomCounter.Aggregation aggregation) {
+    CustomCounter counter = new CustomCounter(
+            groupName, counterName, aggregation);
+    COUNTER_NAMES.add(counter);
+  }
+
+  /**
+   * Get the unique counter group and names
+   *
+   * @return Map of unique counter names
+   */
+  public static Set<CustomCounter> getCustomCounters() {
+    // Create a new HashSet and return that to avoid
+    // ConcurrentModificationException
 
 Review comment:
   This is not relevant any more.

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