swift/doc/source/overview_object_versioning.rst

Object Versioning
=================

.. automodule:: swift.common.middleware.versioned_writes
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object versioning Object versioning in swift is implemented by setting a flag on the container to tell swift to version all objects in the container. The flag is the ``X-Versions-Location`` header on the container, and its value is the container where the versions are stored. When data is ``PUT`` into a versioned container (a container with the versioning flag turned on), the existing data in the file is redirected to a new object and the data in the ``PUT`` request is saved as the data for the versioned object. The new object name (for the previous version) is ``<versions_container>/<object_name>/<timestamp>``, where the timestamp is generated by converting the ``Last-Modified`` header value of the current version to a unix timestamp. A ``GET`` to a versioned object will return the current version of the object without having to do any request redirects or metadata lookups. Change-Id: I4fcd723145e02bbb2ec1d3ad356713f5dea43b8b 2011-12-29 11:29:19 -06:00			`Object Versioning`
			`=================`

versioned writes middleware Rewrite object versioning as middleware to simplify the PUT method in the object controller. The functionality remains basically the same with the only major difference being the ability to now version slo manifest files. dlo manifests are still not supported as part of this patch. Co-Authored-By: Clay Gerrard <clay.gerrard@gmail.com> DocImpact Change-Id: Ie899290b3312e201979eafefb253d1a60b65b837 Signed-off-by: Thiago da Silva <thiago@redhat.com> Signed-off-by: Prashanth Pai <ppai@redhat.com> 2014-11-09 13:13:27 -05:00			`.. automodule:: swift.common.middleware.versioned_writes`
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