e1140666d6
This patch adds methods to increase the partition power of an existing object ring without downtime for the users using a 3-step process. Data won't be moved to other nodes; objects using the new increased partition power will be located on the same device and are hardlinked to avoid data movement. 1. A new setting "next_part_power" will be added to the rings, and once the proxy server reloaded the rings it will send this value to the object servers on any write operation. Object servers will now create a hard-link in the new location to the original DiskFile object. Already existing data will be relinked using a new tool in the new locations using hardlinks. 2. The actual partition power itself will be increased. Servers will now use the new partition power to read from and write to. No longer required hard links in the old object location have to be removed now by the relinker tool; the relinker tool reads the next_part_power setting to find object locations that need to be cleaned up. 3. The "next_part_power" flag will be removed. This mostly implements the spec in [1]; however it's not using an "epoch" as described there. The idea of the epoch was to store data using different partition powers in their own namespace to avoid conflicts with auditors and replicators as well as being able to abort such an operation and just remove the new tree. This would require some heavy change of the on-disk data layout, and other object-server implementations would be required to adopt this scheme too. Instead the object-replicator is now aware that there is a partition power increase in progress and will skip replication of data in that storage policy; the relinker tool should be simply run and afterwards the partition power will be increased. This shouldn't take that much time (it's only walking the filesystem and hardlinking); impact should be low therefore. The relinker should be run on all storage nodes at the same time in parallel to decrease the required time (though this is not mandatory). Failures during relinking should not affect cluster operations - relinking can be even aborted manually and restarted later. Auditors are not quarantining objects written to a path with a different partition power and therefore working as before (though they are reading each object twice in the worst case before the no longer needed hard links are removed). Co-Authored-By: Alistair Coles <alistair.coles@hpe.com> Co-Authored-By: Matthew Oliver <matt@oliver.net.au> Co-Authored-By: Tim Burke <tim.burke@gmail.com> [1] https://specs.openstack.org/openstack/swift-specs/specs/in_progress/ increasing_partition_power.html Change-Id: I7d6371a04f5c1c4adbb8733a71f3c177ee5448bb |
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| api-ref/source | ||
| bin | ||
| doc | ||
| etc | ||
| examples | ||
| install-guide/source | ||
| releasenotes | ||
| swift | ||
| test | ||
| .alltests | ||
| .coveragerc | ||
| .functests | ||
| .gitignore | ||
| .gitreview | ||
| .mailmap | ||
| .manpages | ||
| .probetests | ||
| .testr.conf | ||
| .unittests | ||
| AUTHORS | ||
| babel.cfg | ||
| bandit.yaml | ||
| bindep.txt | ||
| CHANGELOG | ||
| CONTRIBUTING.rst | ||
| LICENSE | ||
| MANIFEST.in | ||
| README.rst | ||
| requirements.txt | ||
| REVIEW_GUIDELINES.rst | ||
| setup.cfg | ||
| setup.py | ||
| test-requirements.txt | ||
| tox.ini | ||
Team and repository tags
Swift
A distributed object storage system designed to scale from a single machine to thousands of servers. Swift is optimized for multi-tenancy and high concurrency. Swift is ideal for backups, web and mobile content, and any other unstructured data that can grow without bound.
Swift provides a simple, REST-based API fully documented at http://docs.openstack.org/.
Swift was originally developed as the basis for Rackspace's Cloud Files and was open-sourced in 2010 as part of the OpenStack project. It has since grown to include contributions from many companies and has spawned a thriving ecosystem of 3rd party tools. Swift's contributors are listed in the AUTHORS file.
Docs
To build documentation install sphinx
(pip install sphinx), run
python setup.py build_sphinx, and then browse to
/doc/build/html/index.html. These docs are auto-generated after every
commit and available online at http://docs.openstack.org/developer/swift/.
For Developers
Getting Started
Swift is part of OpenStack and follows the code contribution, review, and testing processes common to all OpenStack projects.
If you would like to start contributing, check out these notes to help you get started.
The best place to get started is the "SAIO - Swift All In One". This document will walk you through setting up a development cluster of Swift in a VM. The SAIO environment is ideal for running small-scale tests against swift and trying out new features and bug fixes.
Tests
There are three types of tests included in Swift's source tree.
- Unit tests
- Functional tests
- Probe tests
Unit tests check that small sections of the code behave properly. For example, a unit test may test a single function to ensure that various input gives the expected output. This validates that the code is correct and regressions are not introduced.
Functional tests check that the client API is working as expected. These can be run against any endpoint claiming to support the Swift API (although some tests require multiple accounts with different privilege levels). These are "black box" tests that ensure that client apps written against Swift will continue to work.
Probe tests are "white box" tests that validate the internal workings of a Swift cluster. They are written to work against the "SAIO - Swift All In One" dev environment. For example, a probe test may create an object, delete one replica, and ensure that the background consistency processes find and correct the error.
You can run unit tests with .unittests, functional tests
with .functests, and probe tests with
.probetests. There is an additional .alltests
script that wraps the other three.
Code Organization
- bin/: Executable scripts that are the processes run by the deployer
- doc/: Documentation
- etc/: Sample config files
- examples/: Config snippets used in the docs
- swift/: Core code
- account/: account server
- cli/: code that backs some of the CLI tools in bin/
- common/: code shared by different modules
- middleware/: "standard", officially-supported middleware
- ring/: code implementing Swift's ring
- container/: container server
- locale/: internationalization (translation) data
- obj/: object server
- proxy/: proxy server
- test/: Unit, functional, and probe tests
Data Flow
Swift is a WSGI application and uses eventlet's WSGI server. After
the processes are running, the entry point for new requests is the
Application class in swift/proxy/server.py.
From there, a controller is chosen, and the request is processed. The
proxy may choose to forward the request to a back- end server. For
example, the entry point for requests to the object server is the
ObjectController class in
swift/obj/server.py.
For Deployers
Deployer docs are also available at http://docs.openstack.org/developer/swift/. A good starting point is at http://docs.openstack.org/developer/swift/deployment_guide.html
There is an ops runbook that gives information about how to diagnose and troubleshoot common issues when running a Swift cluster.
You can run functional tests against a swift cluster with
.functests. These functional tests require
/etc/swift/test.conf to run. A sample config file can be
found in this source tree in test/sample.conf.
For Client Apps
For client applications, official Python language bindings are provided at http://github.com/openstack/python-swiftclient.
Complete API documentation at http://docs.openstack.org/api/openstack-object-storage/1.0/content/
There is a large ecosystem of applications and libraries that support and work with OpenStack Swift. Several are listed on the associated projects page.
For more information come hang out in #openstack-swift on freenode.
Thanks,
The Swift Development Team