moon-fall commented on issue #3909:
URL: https://github.com/apache/iceberg/issues/3909#issuecomment-1017062429
A large amount of memory is used because each datafile will read all the
data of the deletefile which seqNum is bigger than datafile in a hashSet for
filtering, In the optimized version of my company , I use a Datafile bloom
filter to filter out unnecessary eq-deletefile keys (datafile hashset also
works, but using hashset usually consumes more memory) , if the datafile
support storage Bloom filter Such as using parquet format based on #2642 ，It's
easier to read bloom filters directly from a datafile.
maybe I can pull a request if need.
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