snleee commented on a change in pull request #7368:
URL: https://github.com/apache/pinot/pull/7368#discussion_r717992487



##########
File path: 
pinot-plugins/pinot-minion-tasks/pinot-minion-builtin-tasks/src/main/java/org/apache/pinot/plugin/minion/tasks/mergerollup/MergeRollupTaskGenerator.java
##########
@@ -463,4 +541,57 @@ private long getWatermarkMs(long minStartTimeMs, long 
bucketMs, String mergeLeve
 
     return pinotTaskConfigs;
   }
+
+  private long getMergeRollupTaskDelayInNumTimeBuckets(long watermarkMs, long 
bufferTimeMs, long bucketTimeMs) {
+    if (bufferTimeMs == 0) {
+      return 0;
+    }
+    return (long) Math.floor((System.currentTimeMillis() - watermarkMs - 
bufferTimeMs) / (double) bucketTimeMs);
+  }
+
+  private void setWatermarkMs(String offlineTableName, String mergeLevel, long 
watermarkMs, long bufferTimeMs,
+      long bucketTimeMs) {
+    LOGGER.info(
+        "Setting wartermark for table: {} and mergeLevel: {} is {} 
(watermarkMs={}, bufferTimeMs={}, bucketTimeMs={})",
+        offlineTableName, mergeLevel, 
getMergeRollupTaskDelayInNumTimeBuckets(watermarkMs, bufferTimeMs, 
bucketTimeMs),
+        watermarkMs, bucketTimeMs, bucketTimeMs);
+
+    ControllerMetrics controllerMetrics = 
_clusterInfoAccessor.getControllerMetrics();
+    PinotMetricsRegistry metricsRegistry = 
controllerMetrics.getMetricsRegistry();
+    if (metricsRegistry == null) {
+      return;
+    }
+
+    // Update gauge value that indicates the delay in terms of the number of 
time buckets.
+    MetricKey metricKey = new MetricKey(offlineTableName, mergeLevel);
+    _mergeRollupWatermarks.compute(metricKey, (k, v) -> {
+      if (v == null) {
+        
controllerMetrics.addCallbackGaugeIfNeeded(getMetricNameForTaskDelay(metricKey.toString()),
+            (() -> 
getMergeRollupTaskDelayInNumTimeBuckets(_mergeRollupWatermarks.getOrDefault(k, 
0L), bufferTimeMs,
+                bucketTimeMs)));
+      }
+      return watermarkMs;
+    });
+  }
+
+  private void resetWatermarkMs(String tableNameWithType) {
+    ControllerMetrics controllerMetrics = 
_clusterInfoAccessor.getControllerMetrics();
+    PinotMetricsRegistry metricsRegistry = 
controllerMetrics.getMetricsRegistry();
+    if (metricsRegistry == null) {
+      return;
+    }
+    Iterator<MetricKey> it = _mergeRollupWatermarks.keySet().iterator();
+    while (it.hasNext()) {
+      MetricKey metricKey = it.next();
+      if (metricKey.getTableNameWithType().equals(tableNameWithType)) {
+        it.remove();
+        
controllerMetrics.removeCallbackGauge(getMetricNameForTaskDelay(metricKey.toString()));

Review comment:
       There can be multiple `MetricKey` with the same `tableName`. We will 
have 1 entry per `<tableName, mergeLevel>` pair. So, we will need to traverse 
the entire map...

##########
File path: 
pinot-plugins/pinot-minion-tasks/pinot-minion-builtin-tasks/src/main/java/org/apache/pinot/plugin/minion/tasks/mergerollup/MergeRollupTaskGenerator.java
##########
@@ -463,4 +541,57 @@ private long getWatermarkMs(long minStartTimeMs, long 
bucketMs, String mergeLeve
 
     return pinotTaskConfigs;
   }
+
+  private long getMergeRollupTaskDelayInNumTimeBuckets(long watermarkMs, long 
bufferTimeMs, long bucketTimeMs) {
+    if (bufferTimeMs == 0) {
+      return 0;
+    }
+    return (long) Math.floor((System.currentTimeMillis() - watermarkMs - 
bufferTimeMs) / (double) bucketTimeMs);
+  }
+
+  private void setWatermarkMs(String offlineTableName, String mergeLevel, long 
watermarkMs, long bufferTimeMs,
+      long bucketTimeMs) {
+    LOGGER.info(
+        "Setting wartermark for table: {} and mergeLevel: {} is {} 
(watermarkMs={}, bufferTimeMs={}, bucketTimeMs={})",
+        offlineTableName, mergeLevel, 
getMergeRollupTaskDelayInNumTimeBuckets(watermarkMs, bufferTimeMs, 
bucketTimeMs),
+        watermarkMs, bucketTimeMs, bucketTimeMs);
+
+    ControllerMetrics controllerMetrics = 
_clusterInfoAccessor.getControllerMetrics();
+    PinotMetricsRegistry metricsRegistry = 
controllerMetrics.getMetricsRegistry();
+    if (metricsRegistry == null) {
+      return;
+    }
+
+    // Update gauge value that indicates the delay in terms of the number of 
time buckets.
+    MetricKey metricKey = new MetricKey(offlineTableName, mergeLevel);
+    _mergeRollupWatermarks.compute(metricKey, (k, v) -> {
+      if (v == null) {
+        
controllerMetrics.addCallbackGaugeIfNeeded(getMetricNameForTaskDelay(metricKey.toString()),
+            (() -> 
getMergeRollupTaskDelayInNumTimeBuckets(_mergeRollupWatermarks.getOrDefault(k, 
0L), bufferTimeMs,
+                bucketTimeMs)));
+      }
+      return watermarkMs;
+    });
+  }
+
+  private void resetWatermarkMs(String tableNameWithType) {
+    ControllerMetrics controllerMetrics = 
_clusterInfoAccessor.getControllerMetrics();
+    PinotMetricsRegistry metricsRegistry = 
controllerMetrics.getMetricsRegistry();
+    if (metricsRegistry == null) {
+      return;
+    }
+    Iterator<MetricKey> it = _mergeRollupWatermarks.keySet().iterator();
+    while (it.hasNext()) {
+      MetricKey metricKey = it.next();
+      if (metricKey.getTableNameWithType().equals(tableNameWithType)) {
+        it.remove();
+        
controllerMetrics.removeCallbackGauge(getMetricNameForTaskDelay(metricKey.toString()));

Review comment:
       There can be multiple `MetricKey`s with the same `tableName`. We will 
have 1 entry per `<tableName, mergeLevel>` pair. So, we will need to traverse 
the entire map...




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