Kommentare zu: Cache strategies for Google App Engine http://blog.cloudme.org/2010/02/cache-strategies-for-google-app-engine/ Blog of the CloudMe Project by Moritz Petersen Sun, 27 Mar 2011 15:18:10 +0000 hourly 1 http://wordpress.org/?v=3.3.1 Von: Moritz http://blog.cloudme.org/2010/02/cache-strategies-for-google-app-engine/comment-page-1/#comment-161 Moritz Wed, 17 Mar 2010 19:43:11 +0000 http://blog.cloudme.org/?p=79#comment-161 So far, my application works quite good and there are only few over quota exceptions, so I haven't looked at task queues yet… Why do I want to have the cache built up lazily? That's because I believe that I have a better control about the thumbnail creation process that way and don't need to worry about if a thumbnail was created or not. If I were storing thumbnails only in DB, then I had to handle errors with some custom retry mechanism or a combination of all sort of methods (including the one described in the post). So I decided to go with the simple solution. So far, my application works quite good and there are only few over quota exceptions, so I haven’t looked at task queues yet…
Why do I want to have the cache built up lazily? That’s because I believe that I have a better control about the thumbnail creation process that way and don’t need to worry about if a thumbnail was created or not. If I were storing thumbnails only in DB, then I had to handle errors with some custom retry mechanism or a combination of all sort of methods (including the one described in the post). So I decided to go with the simple solution.

]]> Von: Simon Luijk http://blog.cloudme.org/2010/02/cache-strategies-for-google-app-engine/comment-page-1/#comment-160 Simon Luijk Wed, 17 Mar 2010 19:18:22 +0000 http://blog.cloudme.org/?p=79#comment-160 The task queue tasks are also killed at 30 seconds. You will have to break the task into smaller chunks. How about generating the thumbs when they are uploaded. The task queue tasks are also killed at 30 seconds. You will have to break the task into smaller chunks. How about generating the thumbs when they are uploaded.

]]> Von: Moritz http://blog.cloudme.org/2010/02/cache-strategies-for-google-app-engine/comment-page-1/#comment-96 Moritz Mon, 15 Feb 2010 11:37:17 +0000 http://blog.cloudme.org/?p=79#comment-96 That is another good idea. However, I also like to reduce the number of datastore queries, and decided for memcache instead. I'm using a scheduled task to refresh the cache, but haven't looked at the task queue API yet. There are two problems I'm dealing with when generating thumbnails: (1) The images service gets over quota quite quickly and (2) the scheduled task I've written so far (and which is using a brute-force approach) gets killed after 30 seconds. Maybe a task queue is a better solution. That is another good idea. However, I also like to reduce the number of datastore queries, and decided for memcache instead. I’m using a scheduled task to refresh the cache, but haven’t looked at the task queue API yet.

There are two problems I’m dealing with when generating thumbnails: (1) The images service gets over quota quite quickly and (2) the scheduled task I’ve written so far (and which is using a brute-force approach) gets killed after 30 seconds. Maybe a task queue is a better solution.

]]> Von: Rusty Wright http://blog.cloudme.org/2010/02/cache-strategies-for-google-app-engine/comment-page-1/#comment-95 Rusty Wright Sun, 14 Feb 2010 22:16:21 +0000 http://blog.cloudme.org/?p=79#comment-95 Are you generating the thumbnails every time the page with a thumbnail is requested? If so, instead, why not store the thumbnails in the GAE data store? You could generate the thumbnails using the GAE task queue. Are you generating the thumbnails every time the page with a thumbnail is requested? If so, instead, why not store the thumbnails in the GAE data store? You could generate the thumbnails using the GAE task queue.

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