Hi Pankaj, I have no experience with Hadoop but from the book I gathered there's one Job Manager per application i.e. per jar (as in the example in the first chapter). This is not to say there's one Job Manager per job. Actually I don't think the word Job is defined in the book, I've seen Task defined, and those do have Task Managers
Hope this is along the right lines Regards, Eduardo On Tue, 18 Jun 2019, 08:42 Pankaj Chand, <pankajchanda...@gmail.com> wrote: > I am trying to understand the role of Job Manager in Flink, and have come > across two possibly distinct interpretations. > > 1. The online documentation v1.8 signifies that there is at least one Job > Manager in a cluster, and it is closely tied to the cluster of machines, by > managing all jobs in that cluster of machines. > > This signifies that Flink's Job Manager is much like Hadoop's Application > Manager. > > 2. The book, "Stream Processing with Apache Flink", writes that, "The Job > Manager is the master process that controls the execution of a single > application—each application is controlled by a different Job Manager." > > This signifies that Flink defaults to one Job Manager per job, and the Job > Manager is closely tied to that single job, much like Hadoop's Application > Master for each job. > > Please let me know which one is correct. > > Pankaj >
