Wes McKinney created ARROW-3192:
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Summary: [Java] Implement "ArrowBufReadChannel" abstraction and
alternate MessageSerializer that uses this
Key: ARROW-3192
URL: https://issues.apache.org/jira/browse/ARROW-3192
Project: Apache Arrow
Issue Type: Improvement
Components: Java
Reporter: Wes McKinney
Fix For: 0.12.0
The current MessageSerializer imlementation is wasteful when used to read an
IPC payload that is already in-memory in an {{ArrowBuf}}. In particular, reads
out of a {{ReadChannel}} require memory allocation
*
https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/ipc/message/MessageSerializer.java#L569
*
https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/ipc/message/MessageSerializer.java#L290
In C++, we have abstracted memory allocation out of the IPC read path so that
zero-copy is possible. I suggest that a similar mechanism can be developed for
Java to improve deserialization performance for in-memory messages. The new
interface would return {{ArrowBuf}} when performing reads, which could be
zero-copy when possible, but when not the current strategy of allocate-copy
could be used
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