Motivation:
AbstractDiskHttpData#getChunk opens and closes fileChannel every time when it is invoked,
as a result the uploaded file is corrupted. This is a regression caused by #10270.
Modifications:
- Close the fileChannel only if everything was read or an exception is thrown
- Add unit test
Result:
AbstractDiskHttpData#getChunk closes fileChannel only if everything was read or an exception is thrown
4ce6774336