Yuliya Feldman created ARROW-1627:
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Summary: Reducing memory footprint in
AllocationManager.BufferLedger
Key: ARROW-1627
URL: https://issues.apache.org/jira/browse/ARROW-1627
Project: Apache Arrow
Issue Type: Improvement
Components: Java - Memory
Reporter: Yuliya Feldman
Currently we instantiate IdentityHashMap while creating an instance of
AllocationManager which is in turn is part of BufferLedger
By default IdentityHashMap allocates an array of 64 objects which is 272 bytes
of heap from the start. In reality a lot of ArrowBuf(s) will not need that many
entries in the map, since they want share BufferAllocators with many other
BufferLedgers.
Suggestion is to come up with different collection to save heap w/o sacrificing
much of the performance (if any).
I have a suggestion in mind that I will share via a doc. later today
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