private Map<String, Object> findVariables(String prefix) {
        Map<String, Object> map = new HashMap<>();
        Iterator<String> keyIterator = jobProps.keySet().iterator();
        while (keyIterator.hasNext()) {
            String next = keyIterator.next();
            if (next.startsWith(prefix)) {
                map.put(next.substring(prefix.length()), jobProps.get(next));
            }
        }
        return map;
    }
Looking for custom variables through the corresponding prefix
For example, flow.variable.a=test returns map{a->test}

@param prefix
@return
plugins/azkaban/linkis-jobtype/src/main/java/com/webank/wedatasphere/dss/plugins/azkaban/linkis/jobtype/job/AzkanbanBuilder.java