Hi Ken, >From regular time-based windows do you mean keyed windows?
On Wed, Jan 9, 2019, 10:22 PM Ken Krugler <kkrugler_li...@transpac.com wrote: > Hi there, > > You should be able to use a regular time-based window(), and emit the > HyperLogLog binary data as your result, which then would get merged in your > custom function (which you set a parallelism of 1 on). > > Note that if you are generating unique counts per non-overlapping time > window, you’ll need to keep N HLL structures in each operator. > > — Ken > > > On Jan 9, 2019, at 10:26 AM, CPC <acha...@gmail.com> wrote: > > Hi Stefan, > > Could i use "Reinterpreting a pre-partitioned data stream as keyed stream" > feature for this? > > On Wed, 9 Jan 2019 at 17:50, Stefan Richter <s.rich...@da-platform.com> > wrote: > >> Hi, >> >> I think your expectation about windowAll is wrong, from the method >> documentation: “Note: This operation is inherently non-parallel since all >> elements have to pass through the same operator instance” and I also cannot >> think of a way in which the windowing API would support your use case >> without a shuffle. You could probably build the functionality by hand >> through, but I guess this is not quite what you want. >> >> Best, >> Stefan >> >> > On 9. Jan 2019, at 13:43, CPC <acha...@gmail.com> wrote: >> > >> > Hi all, >> > >> > In our implementation,we are consuming from kafka and calculating >> distinct with hyperloglog. We are using windowAll function with a custom >> AggregateFunction but flink runtime shows a little bit unexpected behavior >> at runtime. Our sources running with parallelism 4 and i expect add >> function to run after source calculate partial results and at the end of >> the window i expect it to send 4 hll object to single operator to merge >> there(merge function). Instead, it sends all data to single instance and >> call add function there. >> > >> > Is here any way to make flink behave like this? I mean calculate >> partial results after consuming from kafka with paralelism of sources >> without shuffling(so some part of the calculation can be calculated in >> parallel) and merge those partial results with a merge function? >> > >> > Thank you in advance... >> >> > -------------------------- > Ken Krugler > +1 530-210-6378 > http://www.scaleunlimited.com > Custom big data solutions & training > Flink, Solr, Hadoop, Cascading & Cassandra > >
