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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
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Copyright 2010-2011 OpenStack LLC
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All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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Welcome to Swift's documentation!
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=================================
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Swift is a highly available, distributed, eventually consistent object/blob
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store. Organizations can use Swift to store lots of data efficiently, safely, and cheaply.
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This documentation is generated by the Sphinx toolkit and lives in the source
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tree. Additional documentation on Swift and other components of OpenStack can
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be found on the `OpenStack wiki`_.
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.. _`OpenStack wiki`: http://wiki.openstack.org
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.. toctree::
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:maxdepth: 1
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getting_started
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Overview and Concepts
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=====================
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.. toctree::
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:maxdepth: 1
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overview_architecture
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overview_ring
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overview_reaper
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overview_auth
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overview_replication
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ratelimit
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overview_large_objects
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overview_object_versioning
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overview_container_sync
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overview_expiring_objects
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Developer Documentation
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=======================
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.. toctree::
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:maxdepth: 1
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development_guidelines
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development_saio
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development_auth
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Administrator Documentation
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===========================
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.. toctree::
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:maxdepth: 1
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howto_installmultinode
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deployment_guide
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admin_guide
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debian_package_guide
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Source Documentation
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====================
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.. toctree::
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:maxdepth: 2
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ring
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proxy
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account
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container
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db
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object
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misc
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Indices and tables
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==================
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* :ref:`genindex`
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* :ref:`modindex`
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* :ref:`search`
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