[Improvement] Avoid copying direct memory when flushing data.

[zhengchenyu]

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• I agree to follow this project's Code of Conduct

Search before asking

• I have searched in the issues and found no similar issues.

What would you like to be improved?

When flush data to local disk, will copy data. See code below:

incubator-uniffle/storage/src/main/java/org/apache/uniffle/storage/handler/impl/LocalFileWriteHandler.java

Line 106 in 0f9d9bc

dataWriter.writeData(ByteBufUtils.readBytes(block.getData()));

In fact, we can direct write ByteBuffer to file channel. For netty mode, the ByteBuffer is DirectByteBuffer, will avoid copy the memory.

How should we improve?

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[xianjingfeng]

Similar issue: #1613

[zhengchenyu]

Similar issue: #1613

I do not notice that pr. I will try to test and check to see if the problem described in #1613 occurs

[maobaolong]

@zhengchenyu Have you reproduced that issue?