fix: store object multipart upload metadata compressed#2125
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Store multipart upload metadata through shared backend helpers so POSIX and Azure use the same encode/decode path. POSIX stores raw gzipped JSON in metadata stores, while Azure stores base64-encoded gzip for string metadata. Retrieval falls back to the legacy raw JSON format for existing objects. Storing the mp metadata compressed in posix will guarantee that for any allowed number of parts, the metadata won't exceed the xattr threshold(64KB).
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Store multipart upload metadata through shared backend helpers so POSIX and Azure use the same encode/decode path. POSIX stores raw gzipped JSON in metadata stores, while Azure stores base64-encoded gzip for string metadata. Retrieval falls back to the legacy raw JSON format for existing objects. Storing the mp metadata compressed in posix will guarantee that for any allowed number of parts, the metadata won't exceed the xattr threshold(64KB).