Arquivo.pt main goal is the preservation and access of web contents that are no longer available online. During the developing of the PWA IR (information retrieval) system we faced limitations in searching speed, quality of results, scalability and usability. To cope with this, we modified the archive-access project (http://archive-access.sourceforge.net/) to support our web archive IR requirements. Nutchwax, Nutch and Wayback’s code were adapted to meet the requirements. Several optimizations were added, such as simplifications in the way document versions are searched and several bottlenecks were resolved. The PWA search engine is a public service at http://archive.pt and a research platform for web archiving. As it predecessor Nutch, it runs over Hadoop clusters for distributed computing following the map-reduce paradigm. Its major features include fast full-text search, URL search, phrase search, faceted search (date, format, site), and sorting by relevance and date. The PWA search engine is highly scalable and its architecture is flexible enough to enable the deployment of different configurations to respond to the different needs. Currently, it serves an archive collection searchable by full-text with 180 million documents ranging between 1996 and 2010.
After testing the filtered CDXJ on preprod everything seems much better. Not only does it load much faster, but also some resources that weren't able to load before are now displaying properly:
VascoRatoFCCN
commented
1 year ago 
The Revisionista collection added a surprisingly high amount of versions for the publico.pt website, possibly other news websites as well:
Having too many versions of the same website leads to some problems:
This problem may be alleviated by distributing the CDX indexes on the document servers or by using ZipNum Sharded Indexes