Distributed Transactions on App Engine - Nick's Blog
Posted by Nick Johnson | Filed under coding, app-engine, cookbook, tech This is the fourth in a series of 'cookbook' posts describing useful strategies and functionality for writing better App Engine applications. As promised, today we're going to discuss Distributed Transactions on App Engine. Distributed transactions are that feature that you didn't know you needed until they were gone: The abil
Using the new bulkloader - Nick's Blog
Posted by Nick Johnson | Filed under tech, app-engine, coding, bulkloader Recently, Matthew Blain, of the App Engine team, announced the prerelease of a new bulkloader. The new bulkloader uses yaml files for configuration, and takes a 'declarative' rather than procedural approach to configuration for downloading and uploading data. As a result, you don't have to understand Python in order to confi
Exploring the new mapper API - Nick's Blog
Posted by Nick Johnson | Filed under app-engine, google-io, coding, mapreduce One of the new features announced at this year's Google I/O is the new mapper library. This library makes it easy to perform bulk operations on your data, such as updating it, deleting it, or transforming/filtering/processing it in some fashion, using the 'map' (and soon, 'reduce') pattern. I'm happy to say that I'm depr
Under the hood with App Engine APIs - Nick's Blog
Posted by Nick Johnson | Filed under python, app-engine, coding, datastore In the past, I've discussed various details of the way various App Engine APIs work under the hood. If you've used certain tools, such as Appstats, too, you probably already have a basic overview of how the App Engine APIs function. Today, we'll take a closer look at the interface between the App Engine runtime and its APIs
ReferenceProperty prefetching in App Engine - Nick's Blog
Posted by Nick Johnson | Filed under python, tech, app-engine, cookbook, coding This post is a brief interlude in the webapps on App Engine series. Fear not, it'll be back! Frequently, we need to do a datastore query for a set of records, then do something with a property referenced by each of those records. For example, supposing we are writing a blogging system, and we want to display a list of
Handling downtime: The capabilities API and testing - Nick's Blog
Posted by Nick Johnson | Filed under python, tech, app-engine, coding, capabilities After the unfortunate outage the other day, how to handle downtime with your App Engine app is a bit of a hot topic. So what better time to address proper error handling for situations where App Engine isn't performing at 100%? There's three major topics to cover here: Handling timeouts from API calls, using the Ca
Modeling relationships in App Engine - Nick's Blog
Posted by Nick Johnson | Filed under python, app-engine, datastore, relational-modelling One source of difficulty for people who are used to relational databases - and certain ORMs in particular - is how to handle references and relationships on App Engine. There's two basic questions here: First, what does a relationship entail, in any database system? And second, how do we use them in App Engine
Storage options on App Engine - Nick's Blog
Posted by Nick Johnson | Filed under app-engine, memcache, storage, datastore, task-queue App Engine provides a number of ways for your app to store data. Some, such as the datastore, are well known, but others are less so, and all of them have different characteristics. This article is intended to enumerate the different options, and describe the pros and cons of each, so you can make more inform
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