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https://issues.apache.org/jira/browse/FLINK-4490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15457902#comment-15457902
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ASF GitHub Bot commented on FLINK-4490:
---------------------------------------

Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2447#discussion_r77309411
  
    --- Diff: 
flink-mesos/src/main/scala/org/apache/flink/mesos/runtime/clusterframework/MesosTaskManager.scala
 ---
    @@ -19,20 +19,19 @@
     package org.apache.flink.mesos.runtime.clusterframework
     
     import org.apache.flink.runtime.clusterframework.types.ResourceID
    -import org.apache.flink.runtime.instance.InstanceConnectionInfo
     import org.apache.flink.runtime.io.disk.iomanager.IOManager
     import org.apache.flink.runtime.io.network.NetworkEnvironment
     import org.apache.flink.runtime.leaderretrieval.LeaderRetrievalService
     import org.apache.flink.runtime.memory.MemoryManager
    -import org.apache.flink.runtime.taskmanager.{TaskManager, 
TaskManagerConfiguration}
    +import org.apache.flink.runtime.taskmanager.{TaskManager, 
TaskManagerConfiguration, TaskManagerLocation}
     
     /** An extension of the TaskManager that listens for additional 
Mesos-related
       * messages.
       */
     class MesosTaskManager(
         config: TaskManagerConfiguration,
         resourceID: ResourceID,
    -    connectionInfo: InstanceConnectionInfo,
    +    connectionInfo: TaskManagerLocation,
    --- End diff --
    
    Shall we rename the variable accordingly?


> Decouple Slot and Instance
> --------------------------
>
>                 Key: FLINK-4490
>                 URL: https://issues.apache.org/jira/browse/FLINK-4490
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Distributed Coordination
>            Reporter: Kurt Young
>             Fix For: 1.2.0
>
>
> Currently, {{Slot}} and {{Instance}} holds each other. For {{Instance}} 
> holding {{Slot}}, it makes sense because it reflects how many resources it 
> can provide and how many are using. 
> But it's not very necessary for {{Slot}} to hold {{Instance}} which it 
> belongs to. It only needs to hold some connection information and gateway to 
> talk to. Another downside for {{Slot}} holding {{Instance}} is that 
> {{Instance}} actually contains some allocate/de-allocation logicals, it will 
> be difficult if we want to do some allocation refactor without letting 
> {{Slot}} noticed. 
> We should abstract the connection information of {{Instance}} to let {{Slot}} 
> holds. (Actually we have {{InstanceConnectionInfo}} now, but lacks of 
> instance's akka gateway, maybe we can just adding the akka gateway to the 
> {{InstanceConnectionInfo}})



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