One problem with this is that we are creating a lot of iterables containing a lot of repeated data. Is there a way to do this so that we can calculate a moving average incrementally?
On Tue, Jan 6, 2015 at 4:44 PM, Sean Owen <so...@cloudera.com> wrote: > Yes, if you break it down to... > > tickerRDD.map(ticker => > (ticker.timestamp, ticker) > ).map { case(ts, ticker) => > ((ts / 60000) * 60000, ticker) > }.groupByKey > > ... as Michael alluded to, then it more naturally extends to the sliding > window, since you can flatMap one Ticker to many (bucket, ticker) pairs, > then group. I think this would implementing 1 minute buckets, sliding by 10 > seconds: > > tickerRDD.flatMap(ticker => > (ticker.timestamp - 60000 to ticker.timestamp by 15000).map(ts => (ts, > ticker)) > ).map { case(ts, ticker) => > ((ts / 60000) * 60000, ticker) > }.groupByKey > > On Tue, Jan 6, 2015 at 8:47 PM, Asim Jalis <asimja...@gmail.com> wrote: > >> I guess I can use a similar groupBy approach. Map each event to all the >> windows that it can belong to. Then do a groupBy, etc. I was wondering if >> there was a more elegant approach. >> >> On Tue, Jan 6, 2015 at 3:45 PM, Asim Jalis <asimja...@gmail.com> wrote: >> >>> Except I want it to be a sliding window. So the same record could be in >>> multiple buckets. >>> >>>