Thank you, Bryce. I would like to consider this option. Toshiya
2012年6月23日土曜日 6時52分46秒 UTC+9 Bryce Cutt: > > If you have large amounts of text in a single field you should get better > compression from zlib than Snappy will get so your data will still be > smaller if you do your own compression. YMMV. > > Also, if you have large text fields you may save on storage costs by > storing this data in the blobstore as the blobstore costs 54% as much as > the datastore. One of my apps does this because I am storing more than 1MB > of text per entity (so it won't fit in the datastore anyways) and it is a > nice side effect that it costs me less to store in the blobstore. > > In my simple tests my compressed text is about 10% of the original size > for large bodies of text and I pay about 54% as much for storage (thanks to > the blobstore) for a "theoretical" cost savings of 94.6% over uncompressed > text. YMMV. Also, keep in mind this adds an extra API call to get your data > as you must request it from the blobstore (plus the time to decompress the > text) which will increase your request time and writing files to the > blobstore does not appear to be possible inside a transaction (unless I am > missing something). > > - Bryce > > > On Thursday, June 21, 2012 10:19:03 PM UTC-7, Toshiya wrote: >> >> Hi, >> >> I've read that compression called snappy ( >> http://code.google.com/p/snappy/) is used in BigTable. >> This means the entities in GAE are compressed when it is stored in >> BigTable. >> But the cost of data stored is calculated before compression, right? >> >> Then, how meaningful is data compression in entities like >> compressed property of python NDB, because using it means double >> compression? >> >> I want to reduce my cost because there are many text in my application. >> But I am wondering is it really better to compress them. >> >> -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/-MAQtWohESUJ. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
