object versioning

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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

This commit is contained in:

John Dickinson

2011年12月29日 11:29:19 -06:00

parent 7044066f66

commit 156f27c921

8 changed files with 579 additions and 238 deletions

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1
etc/container-server.conf-sample

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@@ -27,6 +27,7 @@ use = egg:swift#container

# set log_requests = True

# node_timeout = 3

# conn_timeout = 0.5

# allow_versions = False

[container-replicator]

# You can override the default log routing for this app here (don't use set!):

object versioning

1 etc/container-server.conf-sample Unescape Escape View File

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etc/container-server.conf-sample

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