LakshSingla commented on PR #15420:
URL: https://github.com/apache/druid/pull/15420#issuecomment-1881038647

   Regarding acquisition and freeing up the merge buffers, the 
`GroupByResources` instance will acquire the merge buffers when created with 
the appropriate number. It internally acquires all the merge buffers in a 
single take and separates them into two pools. The individual call sites can 
acquire and release the merge buffers from their respective pools when they 
require them. The GroupByResources instance when closed will release all the 
merge buffers to the Druid byte buffer pool.  


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