0.22.0 Released

The latest Apache Aurora release, 0.22.0, is now available for download. Here are some highlights in this release:

• Updated to Mesos 1.6.1.
• New update strategy added: Variable Batch Update. With this strategy, a job may be updated in in batches of different sizes. For example, an update which modifies a total of 10 instances may be done in batch sizes of 2, 3, and 5. The number of updated instances must equal the size of the current group size in order to move to the next group size. If the number of updated instances is greater to the sum of all group sizes, the last group size will be used in perpetuity until all instances are updated. A new field has been added to UpdateConfig called update_strategy. Update strategy may take a QueueUpdateStrategy, BatchUpdateStrategy, or a VariableBatchUpdateStrategy object. QueueUpdateStrategy and BatchUpdateStrategy take a single integer argument while VariableBatchUpdateStrategy takes a list of positive integers as an argument.
• Users may now set a value for the URI fetcher to rename a downloaded artifact to after it has been downloaded.
• Auto pause feature added to VariableBatch strategy and Batch strategy. With this feature enabled, when an update is ROLLING_FORWARD, the update will automatically pause itself right before a new batch is started. (This feature is being released as tested but in beta state. We are looking to collect feedback before we consider it fully stable.)
• loader.load() now uses memoization on the config file path so that we only load and process each config file once.
• Instances run with custom executors will no longer show links to thermos observer.
• Add observer command line option --disable_task_resource_collection to disable the collection of CPU, memory, and disk metrics for observed tasks. This is useful in setups where metrics cannot be gathered reliable (e.g. when using PID namespaces) or when it is expensive due to hundreds of active tasks per host.
• Added flag -sla_aware_kill_non_prod which allows operators to enable SLA aware killing for non-production jobs. Jobs are considered non-production when they are preemptable and/or revocable.

Deprecations and removals:

• Deprecated use of Thrift fields JobUpdateSettings.waitForBatchCompletion and JobUpdateSettings.updateGroupSize. Please set the proper JobUpdateSettings.updateStrategy instead. Note that these same constructs, as represented in the Aurora DSL, are still valid as they will be converted to the new field automatically by the client for backwards compatibility.
• Backfill code for finding a matching tier to for a Job has been removed. Tier will now be set when a Job is received by the scheduler. If no tier is provided, the default tier defined in -tier_config.

Full release notes are available in the release CHANGELOG.

Thanks

Thanks to the 8 contributors who made Apache Aurora 0.22.0 possible:

• Se Choi
• Raúl Cuza
• Renan DelValle
• Stephan Erb
• Mauricio Garavaglia
• Daniel Knightly
• Philipp Sontag
• Justin Venus