Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/18979
Related to this, updated spec on [Hadoop output stream, Syncable and
StreamCapabilities](https://github.com/steveloughran/hadoop/blob/s3/HADOOP-13327-outputstream-trunk/hadoop-common-project/hadoop-common/src/site/markdown/filesystem/outputstream.md).
As the doc notes, object stores != filesystems, and while a lot can be done
to preserve the metaphor on input, its on output where CRUD inconsistencies
surface. along with the logic as "does a 0-byte file get created in create()",
"when is data written?", etc.
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