mcvsubbu commented on a change in pull request #8176:
URL: https://github.com/apache/pinot/pull/8176#discussion_r804213703



##########
File path: 
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/SegmentDeletionManager.java
##########
@@ -54,21 +56,22 @@
   private static final long MAX_DELETION_DELAY_SECONDS = 300L;  // Maximum of 
5 minutes back-off to retry the deletion
   private static final long DEFAULT_DELETION_DELAY_SECONDS = 2L;
   private static final String DELETED_SEGMENTS = "Deleted_Segments";
+  private static final String RETENTION_MS_SEPARATOR = "__RETENTION_MS__";

Review comment:
       I prefer the absolute time. It is human readable, so if an administrator 
lists the files in the deleted_segments directory, they know exactly when some 
files will go away, or how long some files may remain.
   




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