问不频繁的写入和频繁读取

EN

public class Cluster {
    private List<String> hostPorts;
    private Map<String, JedisPool> hostPool =
            new ConcurrentHashMap<String, JedisPool>();

    public add(String node) {
        hostPorts.add(node);
        hostPool.add(node, create_pool);
    } 

    public remove(String node) {
        hostPorts.remove(node);
        JedisPool pool = hostPool.remove(node)
        pool.destroy();
    }

    public String getMaster(String key) {
        return hostPorts.get(some_hash() % hostPool.size());
    }

    public JedisPool getPool(String node) {
        return redisHostPool.get(node);
    }