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POPros & Cons of Google App Engine
 

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  1. POPros & Cons of Google App Engine
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    <p>[An Updated List 21st Aug 09]</p> <p>Help me Compile a List of all the Advantages &amp; Disadvantages of Building an Application on the Google App Engine</p> <p><strong>Pros:</strong></p> <ol> <li>No need to buy servers or server space (no maintenance).</li> <li>Makes solving the problem of scaling easier.</li> <li>Free up to a certain level of consumed resources.</li> </ol> <p><strong>Cons:</strong></p> <ol> <li>Locked into Google App Engine ?</li> <li>Developers have read-only access to the filesystem on App Engine.</li> <li>App Engine can only execute code called from an HTTP request (except for scheduled background tasks).</li> <li>Users may upload arbitrary Python modules, but only if they are pure-Python; C and Pyrex modules are not supported.</li> <li>App Engine limits the maximum rows returned from an entity get to 1000 rows per Datastore call. (<strong>Update</strong> - App Engine now supports cursors for accessing larger queries)</li> <li>Java applications may only use a subset (The JRE Class White List) of the classes from the JRE standard edition.</li> <li>Java applications cannot create new threads.</li> </ol> <p><strong>Known Issues!!</strong> : <a href="http://code.google.com/p/googleappengine/issues/list" rel="noreferrer">http://code.google.com/p/googleappengine/issues/list</a></p> <p><strong>Hard limits</strong></p> <p>Apps per developer - 10<br> Time per request - 30 sec<br> Files per app - 3,000<br> HTTP response size - 10 MB<br> Datastore item size - 1 MB<br> Application code size - 150 MB<br> <b>Update</b> Blob store now allows storage of files up to 50MB</p> <p><strong>Pro or Con?</strong><br> App Engine's infrastructure removes many of the system administration and development challenges of building applications to scale to millions of hits. Google handles deploying code to a cluster, monitoring, failover, and launching application instances as necessary.</p> <p>While other services let users install and configure nearly any *NIX compatible software, App Engine requires developers to use Python or Java as the programming language and a limited set of APIs. Current APIs allow storing and retrieving data from a BigTable non-relational database; making HTTP requests; sending e-mail; manipulating images; and caching. Most existing Web applications can't run on App Engine without modification, because they require a relational database.</p>
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    1. CONice how you manage to turn features like Cron and Task Queues into 'cons'.
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      1. POPros & Cons of Google App Engine
      1. USNick Johnson
    2. COI am a beginner looking to use Google App Engine, I have no idea what Cron or Task Queues does. You can help me pointing out to some beginner tutorials or books. Its a Wiki!!
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    3. COa lot of this data is out of date. app engine has added many features since this question was asked. It also seems pretty focused on the cons.
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      1. POPros & Cons of Google App Engine
      1. USPeter Recore
 

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