ChenSammi commented on code in PR #8827:
URL: https://github.com/apache/ozone/pull/8827#discussion_r2281865944


##########
hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/ContainerSet.java:
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@@ -469,6 +471,35 @@ public void listContainer(long startContainerId, long 
count,
     }
   }
 
+  /**
+   * This method can be used to get total bytes pending for deletion
+   * in cached interval of time. This can be utilized by either storage
+   * report or other services.
+   */
+  public long getPendingDeletionBytes() {
+    CachedPendingDeletion currentCache = cachedPendingDeletion;
+    if (currentCache != null && !currentCache.isExpired()) {
+      return currentCache.getSize();
+    }
+
+    synchronized (cacheLock) {
+      currentCache = cachedPendingDeletion;
+      if (currentCache != null && !currentCache.isExpired()) {
+        return currentCache.getSize();
+      }
+      long total = 0L;
+      List<Container<?>> containers = new ArrayList<>(containerMap.values());
+      for (Container<?> container : containers) {
+        total += container.getContainerData()
+            .getStatistics()
+            .getBlockPendingDeletionBytes();
+      }
+      long cacheDurationMillis = 5 * 60 * 1000;

Review Comment:
   Please relate this with storage report interval, for example, if storage 
report interval is 60s, then 
   
   cacheDurationMillis = 5 * storage report interval
   
   This way, we can avoid introducing a new property for this trivial cache by 
leveraging storage policy report interval. 



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