途中までですが、翻訳したものを掲載します。Backendを使いこなせれば化けそうな気がします。TaskQueueの変更も気になりますが、まずはBackendを実際につかってみようと思いました。
Version 1.5.0 - May 10, 2011
- Support for Backends which allow developers to create infrastructure components that complement the existing dynamic apps that App Engine already provides. Instances of a backend can maintain state, be addressed individually, and are not subject to per-request time limits. They can also be configured to consume more memory and CPU than ordinary dynamic instances.
⇒Backendを導入しました。Backendは既存のダイナミックな（リクエストに応じて生成される）アプリケーションを補完するサービスです。Backendは実行時間の制約を受けることなく動作し続けます。Backend上のインスタンスは、通常のインスタンスと比べ、多くのメモリとCPUを使用できます。常駐型のアプリケーションを作成できるようです。実現できるアプリケーションの幅が広がりそうですが、いまいち使い方がわかりません。これから調査します！
- Task Queues support pull mode, allowing for more control over task queue work rates. To use pull queues, include the ‘mode’ argument in your queue.yaml.
TaskQueueがプルモード（引っ張るモード）をサポートしました。プルモードを使うと実行頻度をより柔軟に制御できます。プルモードを使うためには、queue.yamlにmode要素を追加してください。
- Pull queues are supported by a REST API, allowing access from outside App Engine. To use the REST API, you must also include a valid ACL section specifying which users can lease tasks from the pull queue.
プルキューは、REST APIをサポートしているため、AppEngineの外部から利用できます。REST APIを使うためには、どのユーザがキューを利用してよいのかACLセクションに記述しなければなりません。
- Task Queue payload limits have been increased. Queues support 100KB per task. Within App Engine, the new limit is 32 MB per batch of tasks. With the REST API the limit is 1 MB per batch.
TaskQueueのPayloadの上限が100KBに増加しました。taskのbatch当たりでの上限は32MB。REST APIでの上限は1MBです。
⇒TaskQueueの利用制限が緩和されているようです。
- HTTP request and response sizes have been increased to 32 MB.
HTTPリクエストとHTTPレスポンスの容量制限が32MBに緩和されました。
⇒これはかなり重要な更新です。2009年2月2日に1.1.9がリリースされた際に1MBから10MBに緩和されて以来の変更です。- We have removed the rate quotas for requests, datastore operations, memcache operations, and image API operations. Resource quotas still apply.
HTTPリクエスト、データストアの操作、Memcachedの操作、画像APIに対するQuota制限を撤廃しました。リソースQuotaは依然として適用されます。
- When creating new applications, developers will now see the High Replication Datastore as the default configuration option. Developers that still wish to use the Master/Slave configuration must explicitly choose this option at application creation time.
High Replication Datastoreを選択できるようになりました。利用する場合はアプリケーション作成時に明示的に選択する必要があります。
→従来のMaster/SlaveタイプのDatastoreと比べると安全性が高いですが、利用料金も高いです。
- The Task Queue maximum configurable processing rate has been increased to 500/s.
TaskQueueの最大処理速度が、1秒間に500回まで設定できるようになりました。
- We have added two restrictions to the Mail API to improve the reliability of the service for all application.
MailAPIの利用制限を厳格にしました。
- Emails must be sent from email accounts managed by Google (either Gmail or a domain signed up for Google Apps).
送信主のメールアドレスは、Google（ドメインはGmailであっても、ユーザの独自ドメインであっても構わない）が管理しているアドレスを使わなければならない。- Reduced the number of free recipients per day from 2000 to 100 for new applications.
無料で使える送信対象の数は、2000から100に減ります。- All application Owners, as listed in the Admin Console, can download the app’s code, unless code download is disabled for the application.
- Added db.py support for making calls to the datastore asynchronously. Available functions are get_async(), put_async(), delete_async(), allocate_ids_async(). Call get_result on the return value of asynchronous datastore functions to block on the call.
- Metadata queries can now get all namespaces, kinds, and properties in a given range.
- The Testbed API now supports the Channel API.
- Users can provide Django settings to be loaded in webapp’s django_setup.
- Modified Dashboard latency graphs to indicate they only include dynamic requests.
- Fixed an issue where metadata queries did not support unicode characters.
- Fixed an issue where HTTP headers could contain new line characters.
- A warning message is shown when the Python version used to run the SDK is different than the Python version used in production.
- Fixed an issue with Federated Users causing the Admin Console dataviewer to fail.
- MacOS and Windows style newlines are now supported for logging in the SDK.
- Fixed an issue where sending mail with smtp_host set did not work.
- Fixed the file permissions for appinfo_errors.py and appinfo.py in the SDK.
- Fixed an issue deploying an app with version set to 0.
- Fixed an issue where the SDK allowed GET or DELETE with a body, which does not work in production.
- Fixed an issue where URLFetch/urllib did not work with MacOS and Python 2.6.0-2.6.3.
- Fixed the an issue in the SDK where the mail body was incorrectly generated when the sendmail option was enabled.
- Fixed an issue in the SDK dataviewer where editing a ListProperty(db.Category) resulted in a BadValueError.
- Fixed an issue in the SDK where the signal module could be imported, as it is not supported.
- Improved support for reserving an app id that is a canonicalized version of a user’s Gmail address.
- Added a more useful error messages for unavailable App Ids.
- The SDK now uses hashlib instead of sha. Python 2.4 is no longer supported.
- Fixed an issue where images.composite() did not support PNG transparency in the SDK.
- Added better error messages for cron.yaml parsing.
- Fixed an issue where uploading an index.yaml file with DOS line endings caused an error.
- Fixed an issue where unicode characters in a script caused an error.
- Task Queue names can now include the “” character.
- The sender of an email is no longer BCC’d when they are already included in the email.
- Fixed an issue where non-string types were interpreted as strings when parsing the index.yaml file.
- Image API now supplies image format.
- Fixed webapp.request.get_range to work with default=None.
- Added a more helpful error message when trying to send email to a malformed address.
- The SDK now returns an error if the Content-length header is not included in a post request, matching production.
- Fixed an issue using URLFetch to fetch pages where the URL contained unicode.
- Fixed an issue where the SDK looked in the wrong folder for the SDK Version file.
- Fixed a webapp.Request get() issue where the default was not being properly returned when allow_multiple was set to True.
- Fixed an issue where handler.get_url did not work for non-default versions of Django.
- Fixed an issue where X-AppEngine-TaskRetryCount did not increment in the SDK.
- Applied a user patch that partially fixed an issue where bulkloader resume was not working.
- Fixed a logging issue with the SDK BlobImageDispatcher.
- ListProperty now supports datetime.time and datetime.date, as documented.
- Fixed an issue where the Content-length header was being incorrectly stored as an integer.
- Fixed an issue where the Admin Console didn’t keep the app version viewed consistent across actions.
- Fixed an issue using os.environ in appengine_config.py in the SDK.
- Fixed an issue where HTTP requests on the SDK where truncated if a semicolon was included in the request.
- Fixed an issue where images.get_serving_url() did not handle blob_info.key() correctly.
- Fixed an issue where checking for a new version caused the appcfg download_app command to fail.
- Fixed a typo in the Admin Console on the New App page.
- Return a better error when a ReferenceProperty fails to resolve.
- Fixed an issue where sending mail from an app registered on the HR datastore required the app id be prefaced with s~.
- Fixed an issue where URLFetch with urllib over HTTPS didn’t work.
