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https://issues.apache.org/jira/browse/ARROW-3191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-3191:
--------------------------------
Component/s: Java
> [Java] Add support for ArrowBuf to point to arbitrary memory.
> -------------------------------------------------------------
>
> Key: ARROW-3191
> URL: https://issues.apache.org/jira/browse/ARROW-3191
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Java
> Reporter: Jacques Nadeau
> Priority: Major
>
> Right now ArrowBuf can only point to memory managed by an Arrow Allocator.
> This is because in many cases we want to be able to support hierarchical
> accounting of memory and the ability to transfer memory ownership between
> separate allocators within the same hierarchy.
> At the same time, there are definitely times where someone might want to map
> some amount of arbitrary off-heap memory. In these situations they should
> still be able to use ArrowBuf.
> I propose we have a new ArrowBuf constructor that takes an input that
> subclasses an interface similar to:
> {code}
> public abstract class Memory {
> protected final int length;
> protected final long address;
> protected abstract void release();
> }
> {code}
> We then make it so all the memory transfer semantics and accounting behavior
> are noops for this type of memory. The target of this work will be to make
> sure that all the fast paths continue to be efficient but some of the other
> paths like transfer can include a conditional (either directly or through
> alternative implementations of things like ledger).
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