Prefect

Released May 28, 2019

Features

- Add new `UnionSchedule` for combining multiple schedules, allowing for complex schedule specifications - [428](https://github.com/PrefectHQ/prefect/issues/428)
- Allow for Cloud users to securely pull Docker images from private registries - [1028](https://github.com/PrefectHQ/prefect/pull/1028)

Enhancements

- Add `prefect_version` kwarg to `Docker` storage for controlling the version of prefect installed into your containers - [1010](https://github.com/PrefectHQ/prefect/pull/1010), [#533](https://github.com/PrefectHQ/prefect/issues/533)
- Warn users if their Docker storage base image uses a different python version than their local machine - [999](https://github.com/PrefectHQ/prefect/issues/999)
- Add flow run id to k8s labels on Cloud Environment jobs / pods for easier filtering in deployment - [1016](https://github.com/PrefectHQ/prefect/pull/1016)
- Allow for `SlackTask` to pull the Slack webhook URL from a custom named Secret - [1023](https://github.com/PrefectHQ/prefect/pull/1023)
- Raise informative errors when Docker storage push / pull fails - [1029](https://github.com/PrefectHQ/prefect/issues/1029)
- Standardized `__repr__`s for various classes, to remove inconsistencies - [617](https://github.com/PrefectHQ/prefect/issues/617)
- Allow for use of local images in Docekr storage - [1052](https://github.com/PrefectHQ/prefect/pull/1052)
- Allow for doc tests and doc generation to run without installing `all_extras` - [1057](https://github.com/PrefectHQ/prefect/issues/1057)

Task Library

- Add task for creating new branches in a GitHub repository - [1011](https://github.com/PrefectHQ/prefect/pull/1011)
- Add tasks to create, delete, invoke, and list AWS Lambda functions [1009](https://github.com/PrefectHQ/prefect/issues/1009)
- Add tasks for integration with spaCy pipelines [1018](https://github.com/PrefectHQ/prefect/issues/1018)
- Add tasks for querying Postgres database [1022](https://github.com/PrefectHQ/prefect/issues/1022)
- Add task for waiting on a Docker container to run and optionally raising for nonzero exit code - [1061](https://github.com/PrefectHQ/prefect/pull/1061)
- Add tasks for communicating with Redis [1021](https://github.com/PrefectHQ/prefect/issues/1021)

Fixes

- Ensure that state change handlers are called even when unexpected initialization errors occur - [1015](https://github.com/PrefectHQ/prefect/pull/1015)
- Fix an issue where a mypy assert relied on an unavailable import - [1034](https://github.com/PrefectHQ/prefect/pull/1034)
- Fix an issue where user configurations were loaded after config interpolation had already taken place - [1037](https://github.com/PrefectHQ/prefect/pull/1037)
- Fix an issue with saving a flow visualization to a file from a notebook - [1056](https://github.com/PrefectHQ/prefect/pull/1056)
- Fix an issue in which mapped tasks incorrectly tried to run when their upstream was skipped - [1068](https://github.com/PrefectHQ/prefect/issues/1068)
- Fix an issue in which mapped tasks were not using their caches locally - [1067](https://github.com/PrefectHQ/prefect/issues/1067)

Breaking Changes

- Changed the signature of `configuration.load_configuration()` - [1037](https://github.com/PrefectHQ/prefect/pull/1037)
- Local Secrets now raise `ValueError`s when not found in context - [1047](https://github.com/PrefectHQ/prefect/pull/1047)

Contributors

- [Zach Angell](https://github.com/zangell44)
- [Nanda H Krishna](https://nandahkrishna.me)
- [Brett Naul](https://github.com/bnaul)
- [Jeremiah Lewis](https://github.com/jlewis91)
- [Dave Hirschfeld](https://github.com/dhirschfeld)

Released May 7, 2019

Features

- Add new `Storage` and `Environment` specifications - [936](https://github.com/PrefectHQ/prefect/pull/936), [#956](https://github.com/PrefectHQ/prefect/pull/956)

Enhancements

- Flow now has optional `storage` keyword - [936](https://github.com/PrefectHQ/prefect/pull/936)
- Flow `environment` argument now defaults to a `CloudEnvironment` - [936](https://github.com/PrefectHQ/prefect/pull/936)
- `Queued` states accept `start_time` arguments - [955](https://github.com/PrefectHQ/prefect/pull/955)
- Add new `Bytes` and `Memory` storage classes for local testing - [956](https://github.com/PrefectHQ/prefect/pull/956), [#961](https://github.com/PrefectHQ/prefect/pull/961)
- Add new `LocalEnvironment` execution environment for local testing - [957](https://github.com/PrefectHQ/prefect/pull/957)
- Add new `Aborted` state for Flow runs which are cancelled by users - [959](https://github.com/PrefectHQ/prefect/issues/959)
- Added an `execute-cloud-flow` CLI command for working with cloud deployed flows - [971](https://github.com/PrefectHQ/prefect/pull/971)
- Add new `flows.run_on_schedule` configuration option for affecting the behavior of `flow.run` - [972](https://github.com/PrefectHQ/prefect/issues/972)
- Allow for Tasks with `manual_only` triggers to be root tasks - [667](https://github.com/PrefectHQ/prefect/issues/667)
- Allow compression of serialized flows [993](https://github.com/PrefectHQ/prefect/pull/993)
- Allow for serialization of user written result handlers - [623](https://github.com/PrefectHQ/prefect/issues/623)
- Allow for state to be serialized in certain triggers and cache validators - [949](https://github.com/PrefectHQ/prefect/issues/949)
- Add new `filename` keyword to `flow.visualize` for automatically saving visualizations - [1001](https://github.com/PrefectHQ/prefect/issues/1001)
- Add new `LocalStorage` option for storing Flows locally - [1006](https://github.com/PrefectHQ/prefect/pull/1006)

Task Library

- None

Fixes

- Fix Docker storage not pulling correct flow path - [968](https://github.com/PrefectHQ/prefect/pull/968)
- Fix `run_flow` loading to decode properly by use cloudpickle - [978](https://github.com/PrefectHQ/prefect/pull/978)
- Fix Docker storage for handling flow names with spaces and weird characters - [969](https://github.com/PrefectHQ/prefect/pull/969)
- Fix non-deterministic issue with mapping in the DaskExecutor - [943](https://github.com/PrefectHQ/prefect/issues/943)

Breaking Changes

- Remove `flow.id` and `task.id` attributes - [940](https://github.com/PrefectHQ/prefect/pull/940)
- Removed old WIP environments - [936](https://github.com/PrefectHQ/prefect/pull/936)
(_Note_: Changes from [936](https://github.com/PrefectHQ/prefect/pull/936) regarding environments don't break any Prefect code because environments weren't used yet outside of Cloud.)
- Update `flow.deploy` and `client.deploy` to use `set_schedule_active` kwarg to match Cloud - [991](https://github.com/PrefectHQ/prefect/pull/991)
- Removed `Flow.generate_local_task_ids()` - [992](https://github.com/PrefectHQ/prefect/pull/992)

Contributors

- None

Released April 19, 2019

Features

- Implement two new triggers that allow for specifying bounds on the number of failures or successes - [933](https://github.com/PrefectHQ/prefect/issues/933)

Enhancements

- `DaskExecutor(local_processes=True)` supports timeouts - [886](https://github.com/PrefectHQ/prefect/issues/886)
- Calling `Secret.get()` from within a Flow context raises an informative error - [927](https://github.com/PrefectHQ/prefect/issues/927)
- Add new keywords to `Task.set_upstream` and `Task.set_downstream` for handling keyed and mapped dependencies - [823](https://github.com/PrefectHQ/prefect/issues/823)
- Downgrade default logging level to "INFO" from "DEBUG" - [935](https://github.com/PrefectHQ/prefect/pull/935)
- Add start times to queued states - [937](https://github.com/PrefectHQ/prefect/pull/937)
- Add `is_submitted` to states - [944](https://github.com/PrefectHQ/prefect/pull/944)
- Introduce new `ClientFailed` state - [938](https://github.com/PrefectHQ/prefect/issues/938)

Task Library

- Add task for sending Slack notifications via Prefect Slack App - [932](https://github.com/PrefectHQ/prefect/issues/932)

Fixes

- Fix issue with timeouts behaving incorrectly with unpickleable objects - [886](https://github.com/PrefectHQ/prefect/issues/886)
- Fix issue with Flow validation being performed even when eager validation was turned off - [919](https://github.com/PrefectHQ/prefect/issues/919)
- Fix issue with downstream tasks with `all_failed` triggers running if an upstream Client call fails in Cloud - [938](https://github.com/PrefectHQ/prefect/issues/938)

Breaking Changes

- Remove `prefect make user config` from cli commands - [904](https://github.com/PrefectHQ/prefect/issues/904)
- Change `set_schedule_active` keyword in Flow deployments to `set_schedule_inactive` to match Cloud - [941](https://github.com/PrefectHQ/prefect/pull/941)

Contributors

- None

Released April 4, 2019

Features

- API reference documentation is now versioned - [270](https://github.com/PrefectHQ/prefect/issues/270)
- Add `S3ResultHandler` for handling results to / from S3 buckets - [879](https://github.com/PrefectHQ/prefect/pull/879)
- Add ability to use `Cached` states across flow runs in Cloud - [885](https://github.com/PrefectHQ/prefect/pull/885)

Enhancements
- Bump to latest version of `pytest` (4.3) - [814](https://github.com/PrefectHQ/prefect/issues/814)
- `Client.deploy` accepts optional `build` kwarg for avoiding building Flow environment - [876](https://github.com/PrefectHQ/prefect/pull/876)
- Bump `distributed` to 1.26.1 for enhanced security features - [878](https://github.com/PrefectHQ/prefect/pull/878)
- Local secrets automatically attempt to load secrets as JSON - [883](https://github.com/PrefectHQ/prefect/pull/883)
- Add task logger to context for easily creating custom logs during task runs - [884](https://github.com/PrefectHQ/prefect/issues/884)

Task Library

- Add `ParseRSSFeed` for parsing a remote RSS feed - [856](https://github.com/PrefectHQ/prefect/pull/856)
- Add tasks for working with Docker containers and imaged - [864](https://github.com/PrefectHQ/prefect/pull/864)
- Add task for creating a BigQuery table - [895](https://github.com/PrefectHQ/prefect/pull/895)

Fixes

- Only checkpoint tasks if running in cloud - [839](https://github.com/PrefectHQ/prefect/pull/839), [#854](https://github.com/PrefectHQ/prefect/pull/854)
- Adjusted small flake8 issues for names, imports, and comparisons - [849](https://github.com/PrefectHQ/prefect/pull/849)
- Fix bug preventing `flow.run` from properly using cached tasks - [861](https://github.com/PrefectHQ/prefect/pull/861)
- Fix tempfile usage in `flow.visualize` so that it runs on Windows machines - [858](https://github.com/PrefectHQ/prefect/issues/858)
- Fix issue caused by Python 3.5.2 bug for Python 3.5.2 compatibility - [857](https://github.com/PrefectHQ/prefect/issues/857)
- Fix issue in which `GCSResultHandler` was not pickleable - [879](https://github.com/PrefectHQ/prefect/pull/879)
- Fix issue with automatically converting callables and dicts to tasks - [894](https://github.com/PrefectHQ/prefect/issues/894)

Breaking Changes

- Change the call signature of `Dict` task from `run(**task_results)` to `run(keys, values)` - [894](https://github.com/PrefectHQ/prefect/issues/894)

Contributors

- [ColCarroll](https://github.com/ColCarroll)
- [dhirschfeld](https://github.com/dhirschfeld)
- [BasPH](https://github.com/BasPH)
- [Miloš Garunović](https://github.com/milosgarunovic)
- [Nash Taylor](https://github.com/ntaylorwss)

Released March 24, 2019

Features

- Add `checkpoint` option for individual `Task`s, as well as a global `checkpoint` config setting for storing the results of Tasks using their result handlers - [649](https://github.com/PrefectHQ/prefect/pull/649)
- Add `defaults_from_attrs` decorator to easily construct `Task`s whose attributes serve as defaults for `Task.run` - [293](https://github.com/PrefectHQ/prefect/issues/293)
- Environments follow new hierarchy (PIN-3) - [670](https://github.com/PrefectHQ/prefect/pull/670)
- Add `OneTimeSchedule` for one-time execution at a specified time - [680](https://github.com/PrefectHQ/prefect/pull/680)
- `flow.run` is now a blocking call which will run the Flow, on its schedule, and execute full state-based execution (including retries) - [690](https://github.com/PrefectHQ/prefect/issues/690)
- Pre-populate `prefect.context` with various formatted date strings during execution - [704](https://github.com/PrefectHQ/prefect/pull/704)
- Add ability to overwrite task attributes such as "name" when calling tasks in the functional API - [717](https://github.com/PrefectHQ/prefect/issues/717)
- Release Prefect Core under the Apache 2.0 license - [762](https://github.com/PrefectHQ/prefect/pull/762)

Enhancements

- Refactor all `State` objects to store fully hydrated `Result` objects which track information about how results should be handled - [612](https://github.com/PrefectHQ/prefect/pull/612), [#616](https://github.com/PrefectHQ/prefect/pull/616)
- Add `google.cloud.storage` as an optional extra requirement so that the `GCSResultHandler` can be exposed better - [626](https://github.com/PrefectHQ/prefect/pull/626)
- Add a `start_time` check for Scheduled flow runs, similar to the one for Task runs - [605](https://github.com/PrefectHQ/prefect/issues/605)
- Project names can now be specified for deployments instead of IDs - [633](https://github.com/PrefectHQ/prefect/pull/633)
- Add a `createProject` mutation function to the client - [633](https://github.com/PrefectHQ/prefect/pull/633)
- Add timestamp to auto-generated API docs footer - [639](https://github.com/PrefectHQ/prefect/pull/639)
- Refactor `Result` interface into `Result` and `SafeResult` - [649](https://github.com/PrefectHQ/prefect/pull/649)
- The `manual_only` trigger will pass if `resume=True` is found in context, which indicates that a `Resume` state was passed - [664](https://github.com/PrefectHQ/prefect/issues/664)
- Added DockerOnKubernetes environment (PIN-3) - [670](https://github.com/PrefectHQ/prefect/pull/670)
- Added Prefect docker image (PIN-3) - [670](https://github.com/PrefectHQ/prefect/pull/670)
- `defaults_from_attrs` now accepts a splatted list of arguments - [676](https://github.com/PrefectHQ/prefect/issues/676)
- Add retry functionality to `flow.run(on_schedule=True)` for local execution - [680](https://github.com/PrefectHQ/prefect/pull/680)
- Add `helper_fns` keyword to `ShellTask` for pre-populating helper functions to commands - [681](https://github.com/PrefectHQ/prefect/pull/681)
- Convert a few DEBUG level logs to INFO level logs - [682](https://github.com/PrefectHQ/prefect/issues/682)
- Added DaskOnKubernetes environment (PIN-3) - [695](https://github.com/PrefectHQ/prefect/pull/695)
- Load `context` from Cloud when running flows - [699](https://github.com/PrefectHQ/prefect/pull/699)
- Add `Queued` state - [705](https://github.com/PrefectHQ/prefect/issues/705)
- `flow.serialize()` will always serialize its environment, regardless of `build` - [696](https://github.com/PrefectHQ/prefect/issues/696)
- `flow.deploy()` now raises an informative error if your container cannot deserialize the Flow - [711](https://github.com/PrefectHQ/prefect/issues/711)
- Add `_MetaState` as a parent class for states that modify other states - [726](https://github.com/PrefectHQ/prefect/pull/726)
- Add `flow` keyword argument to `Task.set_upstream()` and `Task.set_downstream()` - [749](https://github.com/PrefectHQ/prefect/pull/749)
- Add `is_retrying()` helper method to all `State` objects - [753](https://github.com/PrefectHQ/prefect/pull/753)
- Allow for state handlers which return `None` - [753](https://github.com/PrefectHQ/prefect/pull/753)
- Add daylight saving time support for `CronSchedule` - [729](https://github.com/PrefectHQ/prefect/pull/729)
- Add `idempotency_key` and `context` arguments to `Client.create_flow_run` - [757](https://github.com/PrefectHQ/prefect/issues/757)
- Make `EmailTask` more secure by pulling credentials from secrets - [706](https://github.com/PrefectHQ/prefect/issues/706)

Task Library

- Add `GCSUpload` and `GCSDownload` for uploading / retrieving string data to / from Google Cloud Storage - [673](https://github.com/PrefectHQ/prefect/pull/673)
- Add `BigQueryTask` and `BigQueryInsertTask` for executing queries against BigQuery tables and inserting data - [678](https://github.com/PrefectHQ/prefect/pull/678), [#685](https://github.com/PrefectHQ/prefect/pull/685)
- Add `FilterTask` for filtering out lists of results - [637](https://github.com/PrefectHQ/prefect/issues/637)
- Add `S3Download` and `S3Upload` for interacting with data stored on AWS S3 - [692](https://github.com/PrefectHQ/prefect/issues/692)
- Add `AirflowTask` and `AirflowTriggerDAG` tasks to the task library for running individual Airflow tasks / DAGs - [735](https://github.com/PrefectHQ/prefect/issues/735)
- Add `OpenGitHubIssue` and `CreateGitHubPR` tasks for interacting with GitHub repositories - [771](https://github.com/PrefectHQ/prefect/pull/771)
- Add Kubernetes tasks for deployments, jobs, pods, and services - [779](https://github.com/PrefectHQ/prefect/pull/779)
- Add Airtable tasks - [803](https://github.com/PrefectHQ/prefect/pull/803)
- Add Twitter tasks - [803](https://github.com/PrefectHQ/prefect/pull/803)
- Add `GetRepoInfo` for pulling GitHub repository information - [816](https://github.com/PrefectHQ/prefect/pull/816)

Fixes

- Fix edge case in doc generation in which some `Exception`s' call signature could not be inspected - [513](https://github.com/PrefectHQ/prefect/issues/513)
- Fix bug in which exceptions raised within flow runner state handlers could not be sent to Cloud - [628](https://github.com/PrefectHQ/prefect/pull/628)
- Fix issue wherein heartbeats were not being called on a fixed interval - [669](https://github.com/PrefectHQ/prefect/pull/669)
- Fix issue wherein code blocks inside of method docs couldn't use `**kwargs` - [658](https://github.com/PrefectHQ/prefect/issues/658)
- Fix bug in which Prefect-generated Keys for S3 buckets were not properly converted to strings - [698](https://github.com/PrefectHQ/prefect/pull/698)
- Fix next line after Docker Environment push/pull from overwriting progress bar - [702](https://github.com/PrefectHQ/prefect/pull/702)
- Fix issue with `JinjaTemplate` not being pickleable - [710](https://github.com/PrefectHQ/prefect/pull/710)
- Fix issue with creating secrets from JSON documents using the Core Client - [715](https://github.com/PrefectHQ/prefect/pull/715)
- Fix issue with deserialization of JSON secrets unnecessarily calling `json.loads` - [716](https://github.com/PrefectHQ/prefect/pull/716)
- Fix issue where `IntervalSchedules` didn't respect daylight saving time after serialization - [729](https://github.com/PrefectHQ/prefect/pull/729)

Breaking Changes

- Remove the `BokehRunner` and associated webapp - [609](https://github.com/PrefectHQ/prefect/issues/609)
- Rename `ResultHandler` methods from `serialize` / `deserialize` to `write` / `read` - [612](https://github.com/PrefectHQ/prefect/pull/612)
- Refactor all `State` objects to store fully hydrated `Result` objects which track information about how results should be handled - [612](https://github.com/PrefectHQ/prefect/pull/612), [#616](https://github.com/PrefectHQ/prefect/pull/616)
- `Client.create_flow_run` now returns a string instead of a `GraphQLResult` object to match the API of `deploy` - [630](https://github.com/PrefectHQ/prefect/pull/630)
- `flow.deploy` and `client.deploy` require a `project_name` instead of an ID - [633](https://github.com/PrefectHQ/prefect/pull/633)
- Upstream state results now take precedence for task inputs over `cached_inputs` - [591](https://github.com/PrefectHQ/prefect/issues/591)
- Rename `Match` task (used inside control flow) to `CompareValue` - [638](https://github.com/PrefectHQ/prefect/pull/638)
- `Client.graphql()` now returns a response with up to two keys (`data` and `errors`). Previously the `data` key was automatically selected - [642](https://github.com/PrefectHQ/prefect/pull/642)
- `ContainerEnvironment` was changed to `DockerEnvironment` - [670](https://github.com/PrefectHQ/prefect/pull/670)
- The environment `from_file` was moved to `utilities.environments` - [670](https://github.com/PrefectHQ/prefect/pull/670)
- Removed `start_tasks` argument from `FlowRunner.run()` and `check_upstream` argument from `TaskRunner.run()` - [672](https://github.com/PrefectHQ/prefect/pull/672)
- Remove support for Python 3.4 - [671](https://github.com/PrefectHQ/prefect/issues/671)
- `flow.run` is now a blocking call which will run the Flow, on its schedule, and execute full state-based execution (including retries) - [690](https://github.com/PrefectHQ/prefect/issues/690)
- Remove `make_return_failed_handler` as `flow.run` now returns all task states - [693](https://github.com/PrefectHQ/prefect/pull/693)
- Refactor Airflow migration tools into a single `AirflowTask` in the task library for running individual Airflow tasks - [735](https://github.com/PrefectHQ/prefect/issues/735)
- `name` is now required on all Flow objects - [732](https://github.com/PrefectHQ/prefect/pull/732)
- Separate installation "extras" packages into multiple, smaller extras - [739](https://github.com/PrefectHQ/prefect/issues/739)
- `Flow.parameters()` always returns a set of parameters - [756](https://github.com/PrefectHQ/prefect/pull/756)

Major Features

- Add ability to run scheduled flows locally via `on_schedule` kwarg in `flow.run()` - [519](https://github.com/PrefectHQ/prefect/issues/519)
- Allow tasks to specify their own result handlers, ensure inputs and outputs are stored only when necessary, and ensure no raw data is sent to the database - [587](https://github.com/PrefectHQ/prefect/pull/587)

Minor Features

- Allow for building `ContainerEnvironment`s locally without pushing to registry - [514](https://github.com/PrefectHQ/prefect/issues/514)
- Make mapping more robust when running children tasks multiple times - [541](https://github.com/PrefectHQ/prefect/pull/541)
- Always prefer `cached_inputs` over upstream states, if available - [546](https://github.com/PrefectHQ/prefect/pull/546)
- Add hooks to `FlowRunner.initialize_run()` for manipulating task states and contexts - [548](https://github.com/PrefectHQ/prefect/pull/548)
- Improve state-loading strategy for Prefect Cloud - [555](https://github.com/PrefectHQ/prefect/issues/555)
- Introduce `on_failure` kwarg to Tasks and Flows for user-friendly failure callbacks - [551](https://github.com/PrefectHQ/prefect/issues/551)
- Include `scheduled_start_time` in context for Flow runs - [524](https://github.com/PrefectHQ/prefect/issues/524)
- Add GitHub PR template - [542](https://github.com/PrefectHQ/prefect/pull/542)
- Allow flows to be deployed to Prefect Cloud without a project id - [571](https://github.com/PrefectHQ/prefect/pull/571)
- Introduce serialization schemas for ResultHandlers - [572](https://github.com/PrefectHQ/prefect/issues/572)
- Add new `metadata` attribute to States for managing user-generated results - [573](https://github.com/PrefectHQ/prefect/issues/573)
- Add new 'JSONResultHandler' for serializing small bits of data without external storage - [576](https://github.com/PrefectHQ/prefect/issues/576)
- Use `JSONResultHandler` for all Parameter caching - [590](https://github.com/PrefectHQ/prefect/pull/590)

Fixes

- Fixed `flow.deploy()` attempting to access a nonexistent string attribute - [503](https://github.com/PrefectHQ/prefect/pull/503)
- Ensure all logs make it to the logger service in deployment - [508](https://github.com/PrefectHQ/prefect/issues/508), [#552](https://github.com/PrefectHQ/prefect/issues/552)
- Fix a situation where `Paused` tasks would be treated as `Pending` and run - [535](https://github.com/PrefectHQ/prefect/pull/535)
- Ensure errors raised in state handlers are trapped appropriately in Cloud Runners - [554](https://github.com/PrefectHQ/prefect/pull/554)
- Ensure unexpected errors raised in FlowRunners are robustly handled - [568](https://github.com/PrefectHQ/prefect/pull/568)
- Fixed non-deterministic errors in mapping caused by clients resolving futures of other clients - [569](https://github.com/PrefectHQ/prefect/pull/569)
- Older versions of Prefect will now ignore fields added by newer versions when deserializing objects - [583](https://github.com/PrefectHQ/prefect/pull/583)
- Result handler failures now result in clear task run failures - [575](https://github.com/PrefectHQ/prefect/issues/575)
- Fix issue deserializing old states with empty metadata - [590](https://github.com/PrefectHQ/prefect/pull/590)
- Fix issue serializing `cached_inputs` - [594](https://github.com/PrefectHQ/prefect/pull/594)

Breaking Changes

- Move `prefect.client.result_handlers` to `prefect.engine.result_handlers` - [512](https://github.com/PrefectHQ/prefect/pull/512)
- Removed `inputs` kwarg from `TaskRunner.run()` - [546](https://github.com/PrefectHQ/prefect/pull/546)
- Moves the `start_task_ids` argument from `FlowRunner.run()` to `Environment.run()` - [544](https://github.com/PrefectHQ/prefect/issues/544), [#545](https://github.com/PrefectHQ/prefect/pull/545)
- Convert `timeout` kwarg from `timedelta` to `integer` - [540](https://github.com/PrefectHQ/prefect/issues/540)
- Remove `timeout` kwarg from `executor.wait` - [569](https://github.com/PrefectHQ/prefect/pull/569)
- Serialization of States will _ignore_ any result data that hasn't been processed - [581](https://github.com/PrefectHQ/prefect/pull/581)
- Removes `VersionedSchema` in favor of implicit versioning: serializers will ignore unknown fields and the `create_object` method is responsible for recreating missing ones - [583](https://github.com/PrefectHQ/prefect/pull/583)
- Convert and rename `CachedState` to a successful state named `Cached`, and also remove the superfluous `cached_result` attribute - [586](https://github.com/PrefectHQ/prefect/issues/586)