@Henrik Olsen The FetchSFTP will make a separate connection for each file being retrieved. Concurrent Tasks will allow you to specify the number of concurrent connections allowing more then one file to retrieved per processor execution schedule (still one file per connection). - Yes, HDF 3.1 will have all these goodies. Suggest skipping directly to HDF 3.1.2 which was just released since it has a loyt of fixes for some annoying bugs in HDF 3.1 and 3.1.1. - You will have the option to use either an external REDIS configured how you like or an internal NiFi DistributedMapCacheServer with the WAIT and NOTIFY processors. - The DistributedMapCacheServer provides the following configurations: There is no TTL for the DistributedMapCacheServer option. - There also isn't a processor that will dump out the current contents of the DistirbutedMapCacheServer, but you should be able to write a script that can do that for you. Here is an example script that is used to remove a cached entry: https://gist.github.com/ijokarumawak/14d560fec5a052b3a157b38a11955772 - I do not know a lot about REDIS, but as an externally managed cache service, it probably will give you a lot more options as well as a cluster capability so you don't have a single point of failure like you would have with the DistributedMapCacheServer. - Thank you, Matt ... View more