Hi, this is true, yes. If the number of Kafka partitions is less than the parallelism then some of the sources might not be utilized. If you insert a rebalance after the sources you should be able to utilize all the downstream operations equally.
Cheers, Aljoscha On Mon, 4 Jul 2016 at 11:13 Vinay Patil <vinay18.pa...@gmail.com> wrote: > Just an update, the task will be executed by multiple threads , my bad I > asked the wrong way. > Can you please clarify other things. > > Out of 8 node only 3 of them are getting utilized, reading the data from > Kafka , does it mean that the Kafka partitions are set to less number ? > > What if we use rescale or rebalance since it evenly distributes , would > that ensure maximum use of resources ? > > Regards, > Vinay Patil > > On Fri, Jul 1, 2016 at 11:09 PM, Vinay Patil <vinay18.pa...@gmail.com> > wrote: > > > Hi, > > > > According to the documentation : > > *"**Each task is executed by one thread ,**Chaining operators together > > into tasks is a useful optimization: it reduces the overhead of > > thread-to-thread handover and buffering, and increases overall throughput > > while decreasing latency"* > > So does it mean that the single box (refer below mails) represent it as > a *single > > task* and the task will be executed by single thread only ? > > > > I am having 8 node cluster (parallelism set to 56), so what is the > correct > > way to achieve maximum CPU utilization and parallelism ? Does complete > > stream chaining into a single box achieve maximum parallelism ? > > > > The data we are processing is huge volume of data (60,000 records per > > second), so wanted to be sure what we can correct to achieve better > > results. > > > > Regards, > > Vinay Patil > > > > > > On Fri, Jul 1, 2016 at 9:23 PM, Aljoscha Krettek <aljos...@apache.org> > > wrote: > > > >> Hi, > >> yes, the window operator is stateful, which means that it will pick up > >> where it left in case of a failure and restore. > >> > >> You're right about the graph, chained operators are shown as one box. > >> > >> Cheers, > >> Aljoscha > >> > >> On Fri, 1 Jul 2016 at 04:52 Vinay Patil <vinay18.pa...@gmail.com> > wrote: > >> > >> > Hi, > >> > > >> > Just watched the video on Robust Stream Processing . > >> > So when we say Window is a stateful operator , does it mean that even > if > >> > the task manager doing the window operation fails, will it pick up > from > >> > the state left earlier when it comes up ? (Have not read more on state > >> for > >> > now) > >> > > >> > > >> > Also in one of our project when we deploy on cluster and check the Job > >> > Graph , everything is shown in one box , why this happens ? Is it > >> because > >> > of chaining of streams ? > >> > So the box here represent the function flow, right ? > >> > > >> > > >> > > >> > Regards, > >> > Vinay Patil > >> > > >> > > >
