sajjad-moradi commented on code in PR #10754:
URL: https://github.com/apache/pinot/pull/10754#discussion_r1195998765


##########
pinot-controller/src/test/java/org/apache/pinot/controller/helix/core/retention/RetentionManagerTest.java:
##########
@@ -233,6 +233,39 @@ public void testRealtimeLLCCleanup()
     verify(pinotHelixResourceManager, times(1)).deleteSegments(anyString(), 
anyList());
   }
 
+  // This test makes sure that we do not clean up last llc completed segments
+  @Test
+  public void testRealtimeLastLLCCleanup()
+      throws Exception {
+    final long now = System.currentTimeMillis();
+    final int replicaCount = 1;
+
+    TableConfig tableConfig = createRealtimeTableConfig1(replicaCount);
+    List<String> removedSegments = new ArrayList<>();
+    LeadControllerManager leadControllerManager = 
mock(LeadControllerManager.class);
+    when(leadControllerManager.isLeaderForTable(anyString())).thenReturn(true);
+    PinotHelixResourceManager pinotHelixResourceManager =
+        setupSegmentMetadataForPausedTable(tableConfig, now, removedSegments);
+    setupPinotHelixResourceManager(tableConfig, removedSegments, 
pinotHelixResourceManager, leadControllerManager);
+
+    ControllerConf conf = new ControllerConf();
+    ControllerMetrics controllerMetrics = new 
ControllerMetrics(PinotMetricUtils.getPinotMetricsRegistry());
+    conf.setRetentionControllerFrequencyInSeconds(0);
+    conf.setDeletedSegmentsRetentionInDays(0);
+    RetentionManager retentionManager =
+        new RetentionManager(pinotHelixResourceManager, leadControllerManager, 
conf, controllerMetrics);
+    retentionManager.start();
+    retentionManager.run();
+
+    SegmentDeletionManager deletionManager = 
pinotHelixResourceManager.getSegmentDeletionManager();
+
+    // Verify that the removeAgedDeletedSegments() method in deletion manager 
is actually called.
+    verify(deletionManager, 
times(1)).removeAgedDeletedSegments(leadControllerManager);
+
+    // Verify that the deleteSegments method is actually called.
+    verify(pinotHelixResourceManager, times(1)).deleteSegments(anyString(), 
anyList());

Review Comment:
   ```suggestion
       String tableNameWithType = tableConfig.getTableName();
       String deletedSegmentName = new LLCSegmentName("testTable", 5, 0, 
now).getSegmentName();
       verify(pinotHelixResourceManager, 
times(1)).deleteSegments(tableNameWithType, 
ImmutableList.of(deletedSegmentName));
   ```



##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/PinotHelixResourceManager.java:
##########
@@ -872,6 +874,24 @@ public List<SegmentZKMetadata> 
getSegmentsZKMetadata(String tableNameWithType) {
     return ZKMetadataProvider.getSegmentsZKMetadata(_propertyStore, 
tableNameWithType);
   }
 
+  public List<String> getLastLLCCompletedSegments(String tableNameWithType) {
+    Map<Integer, String> partitionIdToLastLLCCompletedSegmentMap = new 
HashMap<>();
+    List<SegmentZKMetadata> realtimeSegments = 
getSegmentsZKMetadata(tableNameWithType);
+    for (SegmentZKMetadata segMetadata : realtimeSegments) {
+      if 
(SegmentName.isLowLevelConsumerSegmentName(segMetadata.getSegmentName())
+          && segMetadata.getStatus() == 
CommonConstants.Segment.Realtime.Status.DONE) {
+        LLCSegmentName llcName = 
LLCSegmentName.of(segMetadata.getSegmentName());
+        int partitionGroupId = llcName.getPartitionGroupId();
+        int sequenceNumber = llcName.getSequenceNumber();
+        String curSegName = 
partitionIdToLastLLCCompletedSegmentMap.get(partitionGroupId);

Review Comment:
   Maybe `s/curSegName/lastCompletedSegName/`



##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/PinotHelixResourceManager.java:
##########
@@ -872,6 +874,24 @@ public List<SegmentZKMetadata> 
getSegmentsZKMetadata(String tableNameWithType) {
     return ZKMetadataProvider.getSegmentsZKMetadata(_propertyStore, 
tableNameWithType);
   }
 
+  public List<String> getLastLLCCompletedSegments(String tableNameWithType) {
+    Map<Integer, String> partitionIdToLastLLCCompletedSegmentMap = new 
HashMap<>();
+    List<SegmentZKMetadata> realtimeSegments = 
getSegmentsZKMetadata(tableNameWithType);
+    for (SegmentZKMetadata segMetadata : realtimeSegments) {

Review Comment:
   ```suggestion
       for (SegmentZKMetadata segMetadata : 
getSegmentsZKMetadata(tableNameWithType)) {
   ```



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