FelixYBW commented on issue #11542:
URL: 
https://github.com/apache/incubator-gluten/issues/11542#issuecomment-3839440357

   > I'm guessing that spill works like this, is that correct? cc 
[@FelixYBW](https://github.com/FelixYBW) 
[@marin-ma](https://github.com/marin-ma)
   > 
   > ```
   > VeloxSortShuffleWriter::reclaimFixedSize --> 
VeloxSortShuffleWriter::evictAllPartitions --> 
VeloxSortShuffleWriter::evictPartition --> RssPartitionWriter::sortEvict
   >                 ^                                                          
                                                                         |
   >                 |                                                          
                                                           require memory to 
compress data
   >                 |                                                          
                                                                         |
   >                 ---------------------------------------- cannot recalim 
memory from shuffle writer again --------------------------------------------
   > ```
   
   We should allocate global memory instead of offheap memory during spill. 
@marin-ma . Did we ?


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