Thanks guys thought it should be easy. I am looking to paginate through the records, not return the most recent value.
If I need to toggle -- which I might -- I was planning on using token api. The KuduScanToken actually implements Comparable and it's implementation is around the tablet. I think this means you can sort the list of KuduScanTokens and call out to each one sequentially. Does that sound crazy? On Mon, Apr 23, 2018 at 3:23 PM Dan Burkert <danburk...@apache.org> wrote: > Hey Scott, > > Patrick's answer is spot on. I'm curious, though, is your usecase to find > the latest value? Effectively a 'SORT BY DESC date LIMIT 1', or are you > looking for the last n values, or all values? I ask because we frequently > get the 'last value' question, and the solution for that might be more > specific (and simpler) than a generalized reverse sort + limit. > > - Dan > > On Mon, Apr 23, 2018 at 1:25 PM, Patrick Angeles <patr...@cloudera.com> > wrote: > >> The common technique is to use (MAX_LONG - timestamp). Unfortunately this >> won't let you toggle the sort order back-and-forth on the same table. You >> could have a duplicate table with the inverse key, effectively using it as >> a secondary index. >> >> As of version 0.98, HBase supports a reverse scan without a 'secondary >> index' table (HBASE-4811), so with a bit of work Kudu may be able to >> provide something similar. >> >> >> Patrick Angeles >> Chief Architect Financial Services >> 151 West 26th Street Suite 1002 | >> <https://maps.google.com/?q=151+West+26th+Street+Suite+1002+%7C%C2%A0+New+York,+NY+10001&entry=gmail&source=g>New >> York, NY 10001 >> <https://maps.google.com/?q=151+West+26th+Street+Suite+1002+%7C%C2%A0+New+York,+NY+10001&entry=gmail&source=g> >> +1 (917) 633-4524 <(917)%20633-4524> >> >> On Sat, Apr 21, 2018 at 10:36 PM, Scott Reynolds <sdrreyno...@gmail.com> >> wrote: >> >>> Today we are using Kudu to store timeseries information and would like >>> the ability to toggle the sort direction. It is unclear to me at the moment >>> how to achieve this efficiently. I naively assumed Kudu could read the >>> primary key in reverse but there doesn't appear to be the case ATM. >>> >>> If you were tasked with implementing a reverse sort on the primary key >>> (Date Desc) how would you go about implementing it ? >>> >>> Thanks! >>> >> >> >
