Xuanwo commented on code in PR #2074:
URL: 
https://github.com/apache/incubator-opendal/pull/2074#discussion_r1174508021


##########
core/src/docs/upgrade.md:
##########
@@ -1,3 +1,18 @@
+# Upgrade to v0.33
+
+OpenDAL 0.33 redesigned the `Writer` API.
+
+- All `writer.append()` should be replaced by `writer.write()` instead.
+
+Please refer to [`Writer`](crate::Writer) for more details.
+
+And internally, services should handle `OpWrite::content_length` correctly.
+
+- If writer doesn't support upload unsized data, please return `NotSupported` 
if `content_length` is `None`.

Review Comment:
   PTAL.



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