abh1sar commented on code in PR #14310:
URL: https://github.com/apache/cloudstack/pull/14310#discussion_r4219035333


##########
engine/schema/src/main/java/com/cloud/usage/dao/UsageBackupDaoImpl.java:
##########
@@ -42,19 +43,50 @@ public class UsageBackupDaoImpl extends 
GenericDaoBase<UsageBackupVO, Long> impl
             " OR ((created <= ?) AND (removed >= ?)))";
 
     @Override
-    public void updateMetrics(final Long vmId, Long backupOfferingId, final 
Long size, final Long virtualSize) {
-        try (TransactionLegacy txn = 
TransactionLegacy.open(TransactionLegacy.USAGE_DB)) {
-            SearchCriteria<UsageBackupVO> sc = this.createSearchCriteria();
-            sc.addAnd("vmId", SearchCriteria.Op.EQ, vmId);
-            sc.addAnd("backupOfferingId", SearchCriteria.Op.EQ, 
backupOfferingId);
-            UsageBackupVO vo = findOneBy(sc);
-            if (vo != null) {
-                vo.setSize(size);
-                vo.setProtectedSize(virtualSize);
-                update(vo.getId(), vo);
+    public List<UsageBackupVO> listActiveUsage(Long vmId, Long 
backupOfferingId) {
+        SearchCriteria<UsageBackupVO> sc = this.createSearchCriteria();
+        sc.addAnd("vmId", SearchCriteria.Op.EQ, vmId);
+        sc.addAnd("backupOfferingId", SearchCriteria.Op.EQ, backupOfferingId);
+        sc.addAnd("removed", SearchCriteria.Op.NULL);
+        return listBy(sc, new Filter(UsageBackupVO.class, "created", false));
+    }
+
+    @Override
+    public void updateMetrics(final Long vmId, final Long backupOfferingId, 
final Long size, final Long virtualSize, final Date eventDate) {
+        final long newSize = size != null ? size : 0L;
+        final long newProtectedSize = virtualSize != null ? virtualSize : 0L;
+        TransactionLegacy txn = 
TransactionLegacy.open(TransactionLegacy.USAGE_DB);
+        try {
+            txn.start();
+            List<UsageBackupVO> activeUsage = listActiveUsage(vmId, 
backupOfferingId);
+            if (activeUsage.isEmpty()) {
+                logger.warn("No active backup usage for VM [{}] and backup 
offering [{}], ignoring backup metrics of size [{}] and protected size [{}].",
+                        vmId, backupOfferingId, newSize, newProtectedSize);
+                txn.commit();
+                return;
+            }
+
+            UsageBackupVO latest = activeUsage.get(0);
+            if (activeUsage.size() == 1 && latest.getSize() == newSize && 
latest.getProtectedSize() == newProtectedSize) {
+                txn.commit();
+                return;
+            }
+
+            // Close the active rows and open one with the new size; this also 
merges duplicates.
+            for (UsageBackupVO usage : activeUsage) {
+                usage.setRemoved(eventDate);
+                update(usage.getId(), usage);
             }
+            UsageBackupVO newUsage = new UsageBackupVO(latest.getZoneId(), 
latest.getAccountId(), latest.getDomainId(), vmId, backupOfferingId, eventDate);
+            newUsage.setSize(newSize);
+            newUsage.setProtectedSize(newProtectedSize);
+            persist(newUsage);
+            txn.commit();
         } catch (final Exception e) {
+            txn.rollback();
             logger.error("Error updating backup metrics: " + e.getMessage(), 
e);

Review Comment:
   It will cause the usage job to throw an exception. The event will not be 
marked as processed and the usage server will try processing it again in the 
next run



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