@InterfaceAudience.Public @InterfaceStability.Evolving public interface ByteBufferReadable
int read(ByteBuffer buf) throws IOException
UnsupportedOperationException, so callers that are not confident in support for this method from the underlying filesystem should be prepared to handle that exception. Implementations should treat 0-length requests as legitimate, and must not signal an error upon their receipt.
buf- the ByteBuffer to receive the results of the read operation.
IOException- if there is some error performing the read
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