---
features:
  - |
    Experimental support for Python 3.6 and 3.7 is now available.
    Note that this requires ``eventlet>=0.25.0``. All unit tests pass,
    and running functional tests under Python 2 will pass against
    services running under Python 3. Expect full support in the
    next minor release.

  - |
    Log formats are now more configurable and include support for
    anonymization. See the ``log_msg_template`` option in ``proxy-server.conf``
    and `the Swift documentation <https://docs.openstack.org/swift/latest/logs.html#proxy-logs>`__
    for more information.

  - |
    Added an operator tool, ``swift-container-deleter``, to asynchronously
    delete some or all objects in a container using the object expirers.

  - |
    Swift-all-in-one Docker images are now built and published to
    https://hub.docker.com/r/openstackswift/saio. These are intended
    for use as development targets, but will hopefully be useful as a
    starting point for other work involving containerizing Swift.

upgrade:
  - |
    The ``object-expirer`` may now be configured in ``object-server.conf``.
    This is in anticipation of a future change to allow the ``object-expirer``
    to be deployed on all nodes that run the ``object-server``.

  - |
    **Dependency updates**: we've increased our minimum supported version
    of ``cryptography`` to 2.0.2 and ``netifaces`` to 0.8. This is largely due
    to the difficulty of continuing to test with the old versions.

    If running Swift under Python 3, ``eventlet`` must be at least 0.25.0.

fixes:
  - |
    Correctness improvements

    * The ``proxy-server`` now ignores 404 responses from handoffs without
      databases when deciding on the correct response for account and
      container requests.

    * Object writes to a container whose existence cannot be verified
      now 503 instead of 404.

  - |
    Sharding improvements

    * The ``container-replicator`` now only attempts to fetch shard ranges if
      the remote indicates that it has shard ranges. Further, it does so
      with a timeout to prevent the process from hanging in certain cases.

    * The ``proxy-server`` now caches 'updating' shards, improving write
      performance for sharded containers. A new config option,
      ``recheck_updating_shard_ranges``, controls the cache time; set it to
      0 to disable caching.

    * The ``container-replicator`` now correctly enqueues
      ``container-reconciler`` work for sharded containers.

  - |
    S3 API improvements

    * Unsigned payloads work with v4 signatures once more.

    * Multipart upload parts may now be copied from other multipart uploads.

    * CompleteMultipartUpload requests with a ``Content-MD5`` now work.

    * ``Content-Type`` can now be updated when copying an object.

    * Fixed v1 listings that end with a non-ASCII object name.

  - |
    Background corruption-detection improvements

    * Detect and remove invalid entries from ``hashes.pkl``

    * When object path is not a directory, just quarantine it,
      rather than the whole suffix.

  - |
    Various other minor bug fixes and improvements.