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

    https://github.com/apache/twill/pull/59#discussion_r131708495
  
    --- Diff: 
twill-core/src/main/java/org/apache/twill/internal/TwillRuntimeSpecification.java
 ---
    @@ -171,9 +168,27 @@ public String getKafkaZKConnect() {
       /**
        * Returns the minimum heap ratio ({@link 
Configs.Keys#HEAP_RESERVED_MIN_RATIO}) based on the given configuration.
        */
    -  private double getMinHeapRatio(Map<String, String> config) {
    -    return config.containsKey(Configs.Keys.HEAP_RESERVED_MIN_RATIO) ?
    -      Double.parseDouble(config.get(Configs.Keys.HEAP_RESERVED_MIN_RATIO)) 
:
    -      Configs.Defaults.HEAP_RESERVED_MIN_RATIO;
    +  private double getMinHeapRatio(@Nullable Map<String, String> config, 
double defaultValue) {
    +    if (config == null) {
    --- End diff --
    
    I think this would be easier to read, and it would give better errors, as 
follows:
    ```
    if (config == null || !config.containsKey(...)) {
      return defaultValue;
    } 
    try {
      double ratio = Double.parseDouble(config.get(...));
    } catch (NumberFormatException) {
      // either warn or throw a more informative exn (including runnable name 
and the bad value)
    }
    if (ratio <= 0d) {
      // either warn or throw a more informative exn (including runnable name 
and the bad value)
    }
    return ratio;
    ```


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