Hi, I'm currently storing data in MongoDB and would like to evaluate Riak as an alternative. Riak is appealing to me because LevelDB uses Snappy, so I would expect it to take less disk space to store my data set than MongoDB which does not use compression. However, when I benchmarked it by inserting a few hundred thousand JSON records into each datastore, Riak in fact took far more disk space. I'm wondering if there's something I might be missing here as a newcomer to Riak. E.g. I checked the disk space used by running "du -ch /var/lib/riak/leveldb". Is this perhaps not a good way to check disk space usage because perhaps Riak/LevelDB preallocates files? (I know MongoDB does this and has a built-in db.collection.stats command to provide true disk usage information). Are there any other reasons why Riak might be taking more space or anything I could have screwed up?
Thanks, Ben -- about.me/benmccann
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