[ 
https://issues.apache.org/jira/browse/GOBBLIN-2104?focusedWorklogId=925686&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-925686
 ]

ASF GitHub Bot logged work on GOBBLIN-2104:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 12/Jul/24 17:53
            Start Date: 12/Jul/24 17:53
    Worklog Time Spent: 10m 
      Work Description: phet commented on code in PR #3983:
URL: https://github.com/apache/gobblin/pull/3983#discussion_r1676256563


##########
gobblin-service/src/main/java/org/apache/gobblin/service/modules/orchestration/task/DagProcessingEngineMetrics.java:
##########
@@ -0,0 +1,155 @@
+/*
+ * 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.gobblin.service.modules.orchestration.task;
+
+import java.util.concurrent.ConcurrentHashMap;
+
+import java.util.concurrent.ConcurrentMap;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.gobblin.metrics.ContextAwareMeter;
+import org.apache.gobblin.metrics.MetricContext;
+import org.apache.gobblin.service.modules.orchestration.DagActionStore;
+import org.apache.gobblin.metrics.ServiceMetricNames;
+
+@Slf4j
+/**
+ * Used to track all metrics relating to processing dagActions when 
DagProcessingEngine is enabled. The metrics can be
+ * used to trace the number of dagActions (which can be further broken down by 
time) at various points of the system,
+ * starting from addition to the DagActionStore to observation in the 
DagActionChangeMonitor through the
+ * DagProcessingEngine pipeline (DagManagement -> DagTaskStreamImpl -> 
MySqlMultiActiveLeaseArbiter -> DagProc).
+ */
+public class DagProcessingEngineMetrics {
+  MetricContext metricContext;
+  // Declare map of dagActionType to a ContextAwareMeter for each metric
+  private ConcurrentMap<String, ContextAwareMeter> dagActionsStoredMeters = 
new ConcurrentHashMap();
+  private ConcurrentMap<String, ContextAwareMeter>dagActionsObservedMeters =  
new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionsLeasesObtainedMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionsNoLongerLeasingMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionLeaseRemindersScheduledMeters =  new 
ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionRemindersProcessedMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionsExceededMaxRetryMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, ContextAwareMeter>dagActionsInitFailedMeters = 
 new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionsInitSucceededMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionExecutionsFailedMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionExecutionsSucceededMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionConclusionsFailedMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionConclusionsSucceededMeters =  new 
ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionsRemovedFromStoreMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionsFailingRemovalMeters =  new ConcurrentHashMap();
+  private ConcurrentMap<String, 
ContextAwareMeter>dagActionAverageProcessingDelayMillisMeters =  new 
ConcurrentHashMap();
+
+  public DagProcessingEngineMetrics(MetricContext metricContext) {
+    this.metricContext = metricContext;
+    registerAllMetrics();
+  }
+
+  public void registerAllMetrics() {
+    registerMetricForEachDagAction(this.dagActionsStoredMeters, 
ServiceMetricNames.DAG_ACTIONS_STORED);
+    registerMetricForEachDagAction(this.dagActionsObservedMeters, 
ServiceMetricNames.DAG_ACTIONS_OBSERVED);
+    registerMetricForEachDagAction(this.dagActionsLeasesObtainedMeters, 
ServiceMetricNames.DAG_ACTIONS_LEASES_OBTAINED);
+    registerMetricForEachDagAction(this.dagActionsNoLongerLeasingMeters, 
ServiceMetricNames.DAG_ACTIONS_NO_LONGER_LEASING);
+    
registerMetricForEachDagAction(this.dagActionLeaseRemindersScheduledMeters, 
ServiceMetricNames.DAG_ACTION_LEASE_REMINDERS_SCHEDULED);
+    registerMetricForEachDagAction(this.dagActionRemindersProcessedMeters, 
ServiceMetricNames.DAG_ACTION_REMINDERS_PROCESSED);
+    registerMetricForEachDagAction(this.dagActionsExceededMaxRetryMeters, 
ServiceMetricNames.DAG_ACTIONS_EXCEEDED_MAX_RETRY);
+    registerMetricForEachDagAction(this.dagActionsInitFailedMeters, 
ServiceMetricNames.DAG_ACTIONS_INIT_FAILED);
+    registerMetricForEachDagAction(this.dagActionsInitSucceededMeters, 
ServiceMetricNames.DAG_ACTIONS_INIT_SUCCEEDED);
+    registerMetricForEachDagAction(this.dagActionExecutionsFailedMeters, 
ServiceMetricNames.DAG_ACTION_EXECUTIONS_FAILED);
+    registerMetricForEachDagAction(this.dagActionExecutionsSucceededMeters, 
ServiceMetricNames.DAG_ACTION_EXECUTIONS_SUCCEEDED);
+    registerMetricForEachDagAction(this.dagActionConclusionsFailedMeters, 
ServiceMetricNames.DAG_ACTION_CONCLUSIONS_FAILED);
+    registerMetricForEachDagAction(this.dagActionConclusionsSucceededMeters, 
ServiceMetricNames.DAG_ACTION_CONCLUSIONS_SUCCEEDED);
+  }
+
+  /**
+   * Create a meter of each dagActionType for the given metric, register it 
with the metric context, and store it in a
+   * concurrent map.
+   * @param metricMap
+   * @param metricName
+   */
+  private void registerMetricForEachDagAction(ConcurrentMap<String, 
ContextAwareMeter> metricMap, String metricName) {
+    for (DagActionStore.DagActionType dagActionType : 
DagActionStore.DagActionType.values()) {
+      metricMap.put(dagActionType.toString(),
+          this.metricContext.contextAwareMeter(metricName + dagActionType));
+    }
+  }
+
+  /**
+   * Updates the meter corresponding to the metricsName and dagActionType 
provided if they match an existing metric
+   * @param metricName
+   * @param dagActionType
+   */
+  public void updateMetricForDagAction(String metricName, 
DagActionStore.DagActionType dagActionType) {

Review Comment:
   a set of type-safe methods would be so preferable - a lot can go wrong w/ 
passing in `String metricName`!
   
   e.g. instead of having a massive switch statement buried within the impl 
which also pushes complexity (and the potential for errors) to callers, by 
making them hard-code a reference to a well-known constant at each point of 
use, such as:
   ```
   
this.dagProcEngineMetrics.updateMetricForDagAction(ServiceMetricNames.DAG_ACTION_REMINDERS_PROCESSED,
                       leaseParams.getDagAction());
   ```
   instead ask them to hard-code a type-safe and semantic method name:
   ```
   this.dagProcEngineMetrics.markReminderProcessed(leaseParams.getDagAction());
   ```
   or
   ```
   this.dagProcEngineMetrics.incrementInitializeSucceeded(dagAction);
   ```
   
   the impl should be trivial:
   ```
   public void markReminderProcessed(DagAction dagAction) {
     updateMetric(this.reminderProcessedMeterByDagActionType, 
dagAction.getDagActionType());
   }
   ```





Issue Time Tracking
-------------------

    Worklog Id:     (was: 925686)
    Time Spent: 1h  (was: 50m)

> Initialize DagProcessingEngine Metrics
> --------------------------------------
>
>                 Key: GOBBLIN-2104
>                 URL: https://issues.apache.org/jira/browse/GOBBLIN-2104
>             Project: Apache Gobblin
>          Issue Type: Bug
>          Components: gobblin-service
>            Reporter: Urmi Mustafi
>            Assignee: Abhishek Tiwari
>            Priority: Major
>          Time Spent: 1h
>  Remaining Estimate: 0h
>




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