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Posted to issues@arrow.apache.org by "Yuliya Feldman (JIRA)" <ji...@apache.org> on 2017/09/30 07:54:02 UTC

[jira] [Created] (ARROW-1627) Reducing memory footprint in AllocationManager.BufferLedger

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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