Prashanth Pai a0977ab8ca dlo: Update doc about manifest containing data ...

Current behavior:
* If data/body is present in manifest file PUT request, the data/body gets
  saved onto disk, just like for a normal object.
* Generally, this data in manifest file is never served on a GET response.
  However, when the manifest object path itself is part of prefix, GET
  response would contain data present in manifest file as well.
* The query param multipart-manifest=get meant to retrieve SLO manifest
  also works in case of DLO manifest. Hence a COPY request with the
  multipart-manifest=get query param would actually copy DLO manifest.

How things should have been:
* The DLO manifest object is supposed to have no content and only have
  X-Object-Manifest metadata header.
* Query param multipart-manifest=get is SLO specific and shouldn't have
  any role in DLO.

This change intends to only document current behaviour and not change it,
assuming there are users who have previously saved some content in DLO
manifest file and/or have been using multipart-manifest=get to fetch
and/or COPY the DLO manifest file with it's content.

Change-Id: I0f6e175ad7752169ecf94df949336e0665928df7
Signed-off-by: Prashanth Pai <ppai@redhat.com>

2015-01-16 10:24:14 +05:30

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