I meant the global whole token range which is -(2^64/2) to ((2^64) / 2 - 1) I remember there are classes that already generate the right slices but don't know by heart which one it was.
2017-01-19 13:29 GMT+01:00 Frank Hughes <frankhughes...@gmail.com>: > I have tried to retrieve the token range and slice in 4, but the response > i get for the following code is different on each node: > > TokenRange[] tokenRanges = > unwrapTokenRanges(metadata.getTokenRanges(keyspaceName, > localHost)).toArray(new TokenRange[0]); > > On each node, the 1024 token ranges are different, so Im not sure how to > do the split. > > e.g. from node 1 > > Token ranges - start:-5144720537407094184 end:-5129226025397315327 > > This token range isn't returned by node 2, 3 or 4. > > Thanks again > > Frank > > On 19 January 2017 at 12:19, Benjamin Roth <benjamin.r...@jaumo.com> > wrote: > >> If you have 4 Nodes with RF 4 then all data is on every node. So you can >> just slice the whole token range into 4 pieces and let each node process 1 >> slice. >> Determining local ranges also only helps if you read with CL_ONE. >> >> 2017-01-19 13:05 GMT+01:00 Frank Hughes <frankhughes...@gmail.com>: >> >>> Hello there, >>> >>> I'm running a 4 node cluster of Cassandra 3.9 with a replication factor >>> of 4. >>> >>> I want to be able to run a java process on each node only selecting a >>> 25% of the data on each node, >>> so i can process all of the data in parallel on each node. >>> >>> What is the best way to do this with the java driver ? >>> >>> I was assuming I could retrieve the token ranges for each node and page >>> through the data using these ranges, but this includes the replicated data. >>> I was hoping there was away of only selecting the data that a node is >>> responsible for and avoiding the replicated data. >>> >>> Many thanks for any help and guidance, >>> >>> Frank Hughes >>> >> >> >> >> -- >> Benjamin Roth >> Prokurist >> >> Jaumo GmbH · www.jaumo.com >> Wehrstraße 46 · 73035 Göppingen · Germany >> Phone +49 7161 304880-6 <+49%207161%203048806> · Fax +49 7161 304880-1 >> <+49%207161%203048801> >> AG Ulm · HRB 731058 · Managing Director: Jens Kammerer >> > > -- Benjamin Roth Prokurist Jaumo GmbH · www.jaumo.com Wehrstraße 46 · 73035 Göppingen · Germany Phone +49 7161 304880-6 · Fax +49 7161 304880-1 AG Ulm · HRB 731058 · Managing Director: Jens Kammerer
