bxfjb commented on issue #8017:
URL: https://github.com/apache/rocketmq/issues/8017#issuecomment-2051537917
> `ByteStreams.toByteArray()` creates large array in memory and is
unnecessary. It seems `FileChannel.transferFrom()` with NIO channel would be
more efficient for writing streams to a file.
Thx for reply, I tried `FileChannel.transferFrom()` but find out some
unittest failed:
```
@Test
public void consumeQueueTest() throws ClassNotFoundException,
NoSuchMethodException {
...
ByteBuffer cqItem1 = fileSegment.read(initPosition, unitSize);
Assert.assertEquals(baseOffset, cqItem1.getLong()); // failed
...
}
```
> java.lang.AssertionError:
Expected :1000
Actual :0
It turns out the cq data was not flush correctly by debugging, I wonder if
the way I use `FileChannel.transferFrom()` is wrong:
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