advancedxy commented on issue #67:
URL: 
https://github.com/apache/arrow-datafusion-comet/issues/67#issuecomment-1964319590

   > Probably we can print java/scala test durations in the CI and then we can 
decided which parts are most time consuming
   
   
   After enable test duration, the most time consuming tests(exceeds one 
minute) on X86 mac runners with JDK 1.8 are: 
   ```
   - Comet columnar shuffle shuffle: different data type (8 minutes, 5 seconds)
   - all types, with nulls (23 minutes, 55 seconds)
   - Comet columnar shuffle shuffle: different data type (8 minutes, 18 seconds)
   - Comet columnar shuffle shuffle: different data type (5 minutes, 59 seconds)
   - Comet columnar shuffle shuffle: different data type (6 minutes, 50 seconds)
   - fix: Too many task completion listener of ArrowReaderIterator causes OOM 
(34 minutes, 33 seconds)
   - Comet columnar shuffle shuffle: different data type (7 minutes, 22 seconds)
   - Comet columnar shuffle shuffle: different data type (6 minutes, 59 seconds)
   ```
   The source is 
https://github.com/apache/arrow-datafusion-comet/actions/runs/8047518357/job/21976917198?pr=116
 
   
   The `fix: Too many task completion listener of ArrowReaderIterator causes 
OOM (34 minutes, 33 seconds)` case looks extreme.  Maybe we should fix it 
first, cc @viirya 


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