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

    https://github.com/apache/twill/pull/59#discussion_r131511023
  
    --- Diff: 
twill-core/src/main/java/org/apache/twill/internal/TwillRuntimeSpecification.java
 ---
    @@ -87,19 +86,46 @@ public String getTwillAppName() {
         return twillAppName;
       }
     
    -  public int getReservedMemory() {
    -    return reservedMemory;
    +  /**
    +   * Returns the minimum heap ratio for the application master.
    +   */
    +  public double getAMMinHeapRatio() {
    +    return getMinHeapRatio(config);
    +  }
    +
    +  /**
    +   * Returns the minimum heap ratio for the given runnable.
    +   */
    +  public double getMinHeapRatio(String runnableName) {
    +    return getMinHeapRatio(runnableConfigs.containsKey(runnableName) ? 
runnableConfigs.get(runnableName) : config);
    --- End diff --
    
    I think this logic is incorrect. It might be that the runnable has its own 
config but does specify a min heap ratio. In that case the min heap ratio 
should come from the (appllication) config, and only if that does not specify a 
min heap ratio, use the default. 


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