GXM2333 opened a new issue #8258:
URL: https://github.com/apache/pinot/issues/8258


   In terms of  MergeRollupTask task, from the [design 
docs](https://docs.google.com/document/d/1gcRBibLvyu4jPQLthVeyhrK68PqqHnC6gpiaSEkYlx0/edit#),
 
   
   I see old segments should be deleted by configuring ` 
“oldSegmentCleanup”:"true"` in offline table config, and this config is default 
to be `true`. But I couldn't find this config from source codes and my offline 
table didn't delete old segments, either.
   
   ![offline table 
segment](https://user-images.githubusercontent.com/24871202/155941703-f1d0a35d-fb41-4dec-8f47-57f5bd5290d4.png)
   my offline table segments are first generated by 
RealtimeToOfflineSegmentsTask, and then merged segments are generated by 
MergeRollupTask.
   
   And same thing happened to RealtimeToOfflineSegmentsTask task which didn't 
delete old realtime segments after the task finished.
   
   ![realtime table 
segment](https://user-images.githubusercontent.com/24871202/155941765-ed0cc023-177a-468f-bdd0-c6467ebf70a5.png)
   
   
   Could you help me how to clean up old segments for MergeRollupTasks and 
RealtimeToOfflineSegmentsTasks? Thanks a lot.
   
   


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