vanzin commented on issue #26508: [SPARK-26260][Core]For disk store tasks 
summary table should show only successful tasks summary
URL: https://github.com/apache/spark/pull/26508#issuecomment-554540314
 
 
   So, to solve this problem, you're changing the format of the data on disk. 
That breaks backwards compatibility (you'll run into problems if you run with 
an old disk store). So you have to update `AppStatusStore.CURRENT_VERSION`.
   
   Given that I don't see a way to fix this without changing the disk format, I 
wonder if there are better alternatives than basically doubling the amount of 
disk space needed to store metrics.
   
   What if you use the same existing fields and indices, but record successful 
tasks with positive numbers, and in progress or failed tasks as negative? You 
need some slight adjustments (e.g. `TaskDataWrapper.hasMetrics` needs to be a 
field now instead of computed from metrics, you need to use `math.abs` when 
returning metrics, etc), but wouldn't it result in the same thing?

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