public PooledByteBufferPair getPooledBufferPair() {
        return byteBufferPool.getPooledBufferPair(keyBufferCapacity, valueBufferCapacity);
    }
@return A {@link PooledByteBufferPair} containing direct {@link ByteBuffer}s from the
pool, each with sufficient capacity for their respective key/value type.
stroom-lmdb/src/main/java/stroom/lmdb/AbstractLmdbDb.java