“MongoDB was used early on at Scrapinghub to store scraped data because it’s convenient. Scraped data is represented as (possibly nested) records which can be serialized to JSON. The schema is not known ahead of time and may change from one job to the next. We need to support browsing, querying and downloading the stored data. This was very easy to implement using MongoDB (easier than the alternatives available a few years ago) and it worked well for some time.
Usage has grown from a simple store for scraped data used on a few projects to the back end of our Scrapy Cloud platform. Now we are experiencing limitations with our current architecture and rather than continue to work with MongoDB, we have decided to move to a different technology (more in a later blog post). Many customers are surprised to hear that we are moving away from MongoDB, I hope this blog post helps explain why it didn’t work for us…”