There has been in the community for a couple of years now a set of patches to support REINDEX CONCURRENTLY, and there have been discussions for having a CLUSTER

There has been in the community for a couple of years now a set of patches to support REINDEX CONCURRENTLY, and there have been discussions for having a CLUSTER CONCURRENTLY, but nothing has materialized. Pushing forward into having such patches would make sense. There are many users asking for the possibility to do tuple reordering without holding an exclusive lock on the relations involved.