[GitHub] [iceberg] szehon-ho commented on pull request #3457: [WIP] Core: Improve performance of expire snapshot by not double-scanning retained Snapshots

[GitBox]

szehon-ho commented on pull request #3457:
URL: https://github.com/apache/iceberg/pull/3457#issuecomment-964782339


   I think this is actually promising, the performance gain is in line with 
expectation.
   
   Test: table with 1000 small snapshots, expire 1 at a time.  The time spent 
in expire-snapshot and input/shuffle sizes falls as most snapshots are not 
double-scanned.
   
   Current:
   <img width="1508" alt="Screenshot 2021-11-09 at 20 38 28" 
src="https://user-images.githubusercontent.com/20555759/141051133-0e66e65d-054d-49c7-9981-31c789b24596.png";>
   
   Optimized:
   <img width="1508" alt="Screenshot 2021-11-09 at 20 38 22" 
src="https://user-images.githubusercontent.com/20555759/141051111-16bef85c-9e89-4e2c-9917-358029e75919.png";>
   
   So I think it's worth to continue.  @rdblue  thanks for the early review, I 
will look at the comments and make the changes
   
   
   


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