Wallaby Series Release Notes

2.27.0

New Features

• Added “audit watcher” hooks to allow operators to run arbitrary code against every diskfile in a cluster. For more information, see the documentation.

• Added support for system-scoped “reader” roles when authenticating using Keystone. Operators may configure this using the system_reader_roles option in the [filter:keystoneauth] section of their proxy-server.conf.

  A comparable group, .reseller_reader, is now available for development purposes when authenticating using tempauth.

• Allow static large object segments to be deleted asynchronously. Operators may opt into this new behaviour by enabling the new allow_async_delete option in the [filter:slo] section in their proxy-server.conf. For more information, see the documentation.

• Added the ability to connect to Memcached over TLS. See the tls_* options in etc/memcache.conf-sample

• The proxy-server now caches ‘listing’ shards, improving listing performance for sharded containers. A new config option, recheck_listing_shard_ranges, controls the cache time and defaults to 10 minutes; set it to 0 to disable caching (the previous behaviour).

• Added a new optional proxy-logging field {wire_status_int} for the status code returned to the client. For more information, see the documentation.

• Memcache client error-limiting is now configurable. See the error_suppression_* options in etc/memcache.conf-sample

• Added tasks_per_second option to rate-limit the object-expirer.

• Added usedforsecurity annotations for use on FIPS-compliant systems.

• S3 API improvements:

  • Make allowable clock skew configurable, with a default value of 15 minutes to match AWS. Note that this was previously hardcoded at 5 minutes; operators may want to preserve the prior behavior by setting allowable_clock_skew = 300 in the [filter:s3api] section of their proxy-server.conf.

  • Container ACLs are now cloned to the +segments container when it is created.

  • Added the ability to configure auth region in s3token middleware.

  • CORS-related headers are now passed through appropriately when using the S3 API. Note that allowed origins and other container metadata must still be configured through the Swift API.

    Preflight requests do not contain enough information to map a bucket to an account/container pair; a new cluster-wide option cors_preflight_allow_origin may be configured for such OPTIONS requests. The default (blank) rejects all S3 preflight requests.

• Sharding improvements:

  • A --no-auto-shard option has been added to swift-container-sharder.

  • The sharder daemon has been enhanced to better support the shrinking of shards that are no longer required. Shard containers will now discover from their root container if they should be shrinking. They will also discover the shards into which they should shrink, which may include the root container itself.

  • A ‘compact’ command has been added to swift-manage-shard-ranges that enables sequences of contiguous shards with low object counts to be compacted into another existing shard, or into the root container.

  • swift-manage-shard-ranges can now accept a config file; this may be used to ensure consistency of threshold values with the container-sharder config.

  • The sharding progress reports in recon cache now continue to be included for a period of time after sharding has completed. The time period may be configured using the recon_sharded_timeout option in the [container-sharder] section of container-server.conf, and defaults to 12 hours.

  • Add root containers with compatible ranges to recon cache.

  • Expose sharding statistics in the backend recon middleware.

• Replication improvements:

  • The post-rsync REPLICATE call no longer recalculates hashes immediately.

  • Hashes are no longer invalidated after a successful ssync; they were already invalidated during the data transfer.

• Added support for Python 3.9.

• Partition power increase improvements:

  • Fixed a bug where stale state files would cause misplaced data during multiple partition power increases.

  • Removed a race condition that could cause newly-written data to not be linked into the new partition for the new partition power.

  • Improved safety during cleanup to ensure files have been relinked appropriately before unlinking.

  • Added an option to drop privileges when running the relinker as root.

  • Added an option to rate-limit how quickly data files are relinked or cleaned up. This may be used to reduce I/O load during partition power increases, improving end-user performance.

  • Rehash partitions during the partition power increase. Previously, we relied on the replication engine to perform the rehash, which could cause an unexpected I/O spike after a partition power increase.

  • Warn when relinking/cleaning up and any disks are unmounted.

  • Log progress per partition when relinking/cleaning up.

  • During clean-up, stop warning about tombstones that got reaped from the new location but not the old.

  • Added the ability to read options from object-server.conf, similar to background daemons.

Known Issues

• Operators should verify that encryption is not enabled in their reconciler pipelines; having it enabled there may harm data durability. For more information, see bug 1910804.

Upgrade Notes

• Added an option to write EC fragments with legacy CRC to ensure a smooth upgrade from liberasurecode<=1.5.0 to >=1.6.2. For more information, see bug 1886088.

Bug Fixes

• Errors downloading a Static Large Object that cause a shorter-than-expected response are now logged as 500s.

• S3 API fixes:

  • Fixed a bug that prevented the s3api pipeline validation described in proxy-server.conf-sample from being performed. As documented, operators can disable this via the auth_pipeline_check option if proxy startup fails with validation errors.

  • Fixed an issue where SHA mismatches in client XML payloads would cause a server error. Swift now correctly responds with a client error about the bad digest.

  • Fixed an issue where non-base64 signatures would cause a server error. Swift now correctly responds with a client error about the invalid digest.

  • The correct storage policy is now logged for S3 requests.

• Sharding fixes:

  • Prevent shard databases from losing track of their root database when deleted.

  • Prevent sharded root databases from being reclaimed to ensure that shards can detect that they have been deleted.

  • Overlapping shrinking shards no longer generate audit warnings; these are expected to sometimes overlap.

• Replication fixes:

  • Fixed a race condition in ssync that could lead to a loss of data durability (or even loss of data, for two-replica policies) when some object servers have outdated rings. Replication via rsync is likely still affected by a similar bug.

  • Non-durable fragments can now be reverted from handoffs.

  • Reduced log noise for common ssync errors.

• Python 3 fixes:

  • Staticweb correctly handles listings when paths include non-ASCII characters.

  • S3 API now allows multipart uploads with non-ASCII characters in the object name.

  • Fixed an import-ordering issue in swift-dispersion-populate.

• Turned off thread-logging when monkey-patching with eventlet. This addresses a potential hang in the proxy-server while logging client disconnects.

• Fixed a bug that could cause EC GET responses to return a server error.

• Fixed an issue with swift-drive-audit when run around New Year’s.

• Server errors encountered when validating the first segment of a Static or Dynamic Large Object now return a 503 to the client, rather than a 409.

• Errors when setting keys in memcached are now logged. This helps operators detect when shard ranges for caching have gotten too large to be stored, for example.

• Various other minor bug fixes and improvements.