Harshavardhana 361940706d fix: avoid races in NewMultipartUpload under multiple pools (#12233) ...

It is possible in some scenarios that in multiple pools,
two concurrent calls for the same object as a multipart operation
can lead to duplicate entries on two different pools.

This PR fixes this

- hold locks to serialize multiple callers so that we don't race.
- make sure to look for existing objects on the namespace as well
  not just for existing uploadIDs

2021-05-06 10:45:33 -07:00

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