[stable33] fix(ObjectStore): reset multipart upload byte counter on retry - #62995
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writeMultiPart() initializes $totalWritten once outside the retry loop, so bytes from a failed first attempt accumulate into the second attempt. Since $state is never resumed, each retry rewinds the stream and re-uploads the whole object from scratch, making before_complete compare roughly twice the object size against the expected size. The retry then always fails with "Incomplete multi part upload, expected X bytes, wrote 2X" and the upload is aborted. Reset the counter per attempt so the size check validates only the bytes written by the current attempt. Fixes #59505 Signed-off-by: Ching Kuo <igene@igene.tw> Assisted-by: Claude Code:claude-fable-5
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Backport of PR #62919