hy00nc commented on issue #213: [NEMO-383] Implement DirectByteBufferOutputStream for Off-heap SerializedMemoryStore URL: https://github.com/apache/incubator-nemo/pull/213#issuecomment-482940459 > +1 for adding getByteBuffer(). However, I think there would be some cases where toByteArray() is still necessary. How about implementing both methods and add comments for toByteArray() that it can degrade the performance due to the array copies? 2019년 4월 14일 (일) 오후 4:56, Taegeon Um <[email protected]>님이 작성: > […](#) > ***@***.**** commented on this pull request. ------------------------------ In common/src/main/java/org/apache/nemo/common/DirectByteBufferOutputStream.java <[#213 (comment)](https://github.com/apache/incubator-nemo/pull/213#discussion_r275144557)>: > + temp.flip(); + byteToWrite = temp.remaining(); + temp.get(byteArray, start, byteToWrite); + start += byteToWrite; + } + // The limit of the last buffer has to be set to the capacity for re-write. + lastBuf.limit(lastBuf.capacity()); + + return byteArray; + } + + /** + * Closes this output stream and releases resources. + */ + @override + public void close() { Avro also implemented ByteBufferOutputStream, which returns the list of ByteBuffer. https://avro.apache.org/docs/1.5.4/api/java/org/apache/avro/util/ByteBufferOutputStream.html — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <[#213 (comment)](https://github.com/apache/incubator-nemo/pull/213#discussion_r275144557)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AETjDIpO-5R5WKCV4dWdKuoHFGycy8qBks5vgt8lgaJpZM4cuZ5J> . I think creating `getByteBuffer()` is a nice idea too. I will add comments regarding the performance issue of `toByteArray()`. And just like @taegeonum mentioned, I assume `close()` method should do nothing for this output stream for now as long as there is a usage for `toByteArray()`. In Nemo, I found the usage of obtaining the byte array after closing the `wrappedStream` which includes the output stream. (though the comments say that closing the `wrapperStream` is dependent on the property of `DirectByteArrayOutputStream`.)
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