ashishkumar50 commented on code in PR #9635:
URL: https://github.com/apache/ozone/pull/9635#discussion_r2689430486


##########
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/service/KeyDeletingService.java:
##########
@@ -139,23 +139,53 @@ Pair<Pair<Integer, Long>, Boolean> 
processKeyDeletes(Map<String, PurgedKey> keyB
       String snapTableKey, UUID expectedPreviousSnapshotId) throws IOException 
{
     long startTime = Time.monotonicNow();
     Pair<Pair<Integer, Long>, Boolean> purgeResult = Pair.of(Pair.of(0, 0L), 
false);
+    
+    // Filter out empty files (files with no blocks) before sending to SCM
+    Map<String, PurgedKey> nonEmptyKeyBlocksList = 
keyBlocksList.entrySet().stream()
+        .filter(entry -> entry.getValue().getBlockGroup() != null && 
+                         entry.getValue().getBlockGroup().getDeletedBlocks() 
!= null &&
+                         
!entry.getValue().getBlockGroup().getDeletedBlocks().isEmpty())
+        .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    
     if (LOG.isDebugEnabled()) {
-      LOG.debug("Send {} key(s) to SCM: {}",
-          keyBlocksList.size(), keyBlocksList);
+      LOG.debug("Send {} key(s) to SCM (filtered {} empty files): {}",
+          nonEmptyKeyBlocksList.size(), keyBlocksList.size() - 
nonEmptyKeyBlocksList.size(), nonEmptyKeyBlocksList);
     } else if (LOG.isInfoEnabled()) {
       int logSize = 10;
-      if (keyBlocksList.size() < logSize) {
-        logSize = keyBlocksList.size();
+      if (nonEmptyKeyBlocksList.size() < logSize) {
+        logSize = nonEmptyKeyBlocksList.size();
       }
-      LOG.info("Send {} key(s) to SCM, first {} keys: {}",
-          keyBlocksList.size(), logSize, 
keyBlocksList.entrySet().stream().limit(logSize)
+      LOG.info("Send {} key(s) to SCM (filtered {} empty files), first {} 
keys: {}",
+          nonEmptyKeyBlocksList.size(), keyBlocksList.size() - 
nonEmptyKeyBlocksList.size(), logSize,
+          nonEmptyKeyBlocksList.entrySet().stream().limit(logSize)

Review Comment:
   These empty files can happen mostly in testing, No need to update normal 
logs to avoid confusion. Instead please add separate debug log if any empty 
files/blocks are present.



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