public PooledByteBuffer getPooledKeyBuffer() {
        return byteBufferPool.getPooledByteBuffer(keyBufferCapacity);
    }
@return A {@link PooledByteBuffer} containing a direct {@link ByteBuffer} from the
pool with sufficient capacity for this database's key type.
stroom-lmdb/src/main/java/stroom/lmdb/AbstractLmdbDb.java