Bruce J Schuchardt created GEODE-8506:
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Summary: BufferPool returns byte buffers that may be much larger
than requested
Key: GEODE-8506
URL: https://issues.apache.org/jira/browse/GEODE-8506
Project: Geode
Issue Type: Improvement
Components: membership
Reporter: Bruce J Schuchardt
BufferPool manages several pools of direct-memory ByteBuffers. When asked for
a ByteBuffer of size X you may receive a buffer that is any size greater than
or equal to X. For users of this pool this is unexpected behavior and is
causing some trouble.
MessageStreamer, for instance, performs message "chunking" based on the size of
a socket's buffer size. It requests a byte buffer of that size and then fills
it over and over again with message chunks to be written to the socket. But it
does this based on the buffer's capacity, which may be much larger than the
expected buffer size. This results in incorrect chunking and requires larger
buffers in the receiver of these message chunks.
BufferPool should always return a buffer that has exactly the requested
capacity. It could be a _slice_ of a pooled buffer, for instance. That would
let it hand out a larger buffer while not confusing the code that requested the
buffer.
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