NealSun96 commented on a change in pull request #1231:
URL: https://github.com/apache/helix/pull/1231#discussion_r468221660



##########
File path: helix-core/src/main/java/org/apache/helix/task/JobConfig.java
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@@ -147,10 +147,17 @@
     StartTime,
 
     /**
-     * The expiration time for the job
+     * The expiration time for the job if it's completed; once the expiry is 
reached and the job is
+     * completed, the job will be purged
      */
     Expiry,
 
+    /**
+     * The expiration time for the job if it's failed or timed out; once the 
expiry is reached and
+     * the job has failed or timed out, the job will be purged
+     */
+    TerminalStateExpiry,

Review comment:
       @dasahcc The default behavior being not purging is already implemented: 
not specifying the expiry = not purging; we don't need an extra boolean flag. 
   
   I understand where your came from, but the flexibility should be a good 
thing; after all, wouldn't users be more inclined to investigate 
failed/timed-out jobs comparing to completed jobs? The investigation 
flexibility should be more suited for the terminal state expiry. 
   
   For what its worth, if a user want to "keep an eye out for Job0 if it fails, 
but don't care if the other jobs fail", then it's easy to config that way: give 
Job0 no expiry (not purging), and give other jobs an expiry. 




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