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Posted to dev@flink.apache.org by "vim (JIRA)" <ji...@apache.org> on 2019/06/21 02:41:00 UTC

[jira] [Created] (FLINK-12921) Flink Job Scheduling

vim created FLINK-12921:
---------------------------

             Summary: Flink Job Scheduling
                 Key: FLINK-12921
                 URL: https://issues.apache.org/jira/browse/FLINK-12921
             Project: Flink
          Issue Type: Improvement
          Components: API / DataSet, API / DataStream
    Affects Versions: 1.8.0
         Environment: flink 1.7.0

jdk8
            Reporter: vim


This is an example from flink-docs:

Consider a program with a data source, a _MapFunction_, and a _ReduceFunction_. The source and MapFunction are executed with a parallelism of 4, while the ReduceFunction is executed with a parallelism of 3. A pipeline consists of the sequence Source - Map - Reduce. On a cluster with 2 TaskManagers with 3 slots each, the program will be executed as described below.

!https://ci.apache.org/projects/flink/flink-docs-release-1.8/fig/slots.svg!

But after I tried, I found that it was not like this. My result is TaskManager 1 used 3 slot, but TaskManager 2 just used 1 slot. Who else has tested this example?



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