It is not possible to change the Heap size or other "-X" params of the Hub JVM

[charlescapps]

In Config.java, you can see the param string is computed by always prepending "-D" to a key-value pair:
Consequently, using the "grid_jvm_options" option, it's impossible to set "-Xmx4g" or something like that to increase the heap size of the hub.

I will fix this by adding an additional config option, "grid_jvm_x_options" which is just a raw string you can add to the commandline options.

Here's the faulty code that limits us too much:

protected String mapToJvmParams(Map params) {
        String returnString = "";

        for (String key : params.keySet()) {
            Object value = params.get(key);
            String formattedValue = "";

            if (value instanceof Number) {
                formattedValue = "" + ((Number) value).intValue() + "";
            } else {
                formattedValue = value.toString();
            }

            returnString = returnString + "-D" + key + "=" + formattedValue + " ";
        }

        return returnString;
    }

[charlescapps]

Thanks for merging my pull request!

[smccarthy]

You're welcome!