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From "Karol Brejna (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GEARPUMP-149) Binding tasks to workers
Date Sat, 21 May 2016 12:12:12 GMT
Karol Brejna created GEARPUMP-149:
-------------------------------------

             Summary: Binding tasks to workers
                 Key: GEARPUMP-149
                 URL: https://issues.apache.org/jira/browse/GEARPUMP-149
             Project: Apache Gearpump
          Issue Type: Improvement
            Reporter: Karol Brejna
            Priority: Minor


Let's assume that we have a cluster with some "specialized" nodes (for
example a worker on IoT device that is responsible for controlling some
actuators, dedicated workers to achieve data locality, some hardware
specific - mem/cpu - tasks, etc.).

There should be a way to "hint" Gearpump to prefer some nodes (workers) over others for certain
tasks (executors). 

We already have "localities" feature. Developer can add a configuration (when submitting 
the application) to bind a task with a worker:
{code}
gearpump {
  streaming {
    localities {
      app1: {            //This is the application name to be submitted
        workerId: [    //The worker id where to launch Task0_0 and Task0_1
          TaskId(0,0), TaskId(0,1)
        ]
      }
    }
  }
}
{code}

The problem is: users have no idea what each Task's task ID is (especially if there are lots
of nodes in a DAG).

We could introduce more flexible "binding" mechanism, for example labeling tasks and workers
or using some other "awareness" algorithm.



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