public List<Host> commonPrefixIssues(String prefix) {
        List<Host> list = new ArrayList<Host>();
        PGridPath prefixPath = new PGridPath(prefix);
        for (String path : unsolvedPaths_.keySet()) {
            PGridPath otherPath = new PGridPath(path);
            if (otherPath.hasPrefix(prefixPath)) {
                list.add(Deserializer.deserializeHost(unsolvedPaths_.get(path).failedPeer));
            }
        }
        return list;
    }