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

    https://github.com/apache/brooklyn-server/pull/916#discussion_r157902790
  
    --- Diff: 
core/src/main/java/org/apache/brooklyn/entity/group/DynamicClusterImpl.java ---
    @@ -799,6 +795,14 @@ protected Entity replaceMember(Entity member, 
@Nullable Location memberLoc, Map<
         /** <strong>Note</strong> for sub-classes; this method can be called 
while synchronized on {@link #mutex}. */
         protected Collection<Entity> grow(int delta) {
             Preconditions.checkArgument(delta > 0, "Must call grow with 
positive delta.");
    +        Integer maxSize = config().get(MAX_SIZE);
    +        if (maxSize != null) {
    +            final int desiredSize = getCurrentSize() + delta;
    +            if (desiredSize > maxSize) {
    +                throw new Resizable.InsufficientCapacityException(
    --- End diff --
    
    Should we throw if we'd be willing to grow a bit? e.g. if we're current 
size 1 and asked to resize by delta of 10, but max size is 10 then should we 
resize to 10 or should we fail? I think we should only fail if 
`getCurrentSize() == maxSize`


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