Hazelcast近缓存

Question

我设置了两个节点hazelcast 3.2，每个节点包含500 MB数据。我已经配置了客户端近缓存。

我有以下问题

1. 如何验证是否从近缓存hashmap中提取数据？
2. 我的一些地图只有一个条目，即size = 1，有时会打开 重负载需要20到30毫秒才能获取数据？
3. 重载时间在4ms到20 ms之间。如果是这样的话 从近缓存中获取，最佳获取时间是什么 毫秒。
4. 在服务器上设置的最佳GC策略是什么？

我的服务器端配置

mapCfg = new MapConfig();
mapCfg.setName("TL_MAP_2");
mapCfg.setBackupCount(1);
mapCfg.setReadBackupData(true);//enabled as it is sync backup
mapCfg.setInMemoryFormat(InMemoryFormat.BINARY);
cfg.addMapConfig(mapCfg);

我的客户端代码是单身

public enum CacheService {
    INSTANCE;

    private static ClientConfig clientConfig = null;
    private static HazelcastInstance cacheClient = null;
    private static Set<String> nearcaches = new HashSet<String>(Arrays.asList("TL_MAP_1","TL_MAP_2","TL_MAP_3","TL_MAP_4","TL_MAP_5","TL_MAP_6","TL_MAP_7","TL_MAP_8","TL_MAP_9","TL_MAP_10"));

    static{

        if(clientConfig ==null || cacheClient ==null){

        clientConfig = new ClientConfig();
        clientConfig.getGroupConfig().setName("dev").setPassword("dev-pass");
        clientConfig.getNetworkConfig().addAddress("XXX.XX.XXX.XXX:5701","XXX.XX.XXX.XXX:5702").setSmartRouting(true);;


        clientConfig.setExecutorPoolSize(120);
        Iterator<String> iterator = nearcaches.iterator();
        String near = null;
        while(iterator.hasNext()){
            near = iterator.next();
            clientConfig.addNearCacheConfig(near, new NearCacheConfig().setInMemoryFormat(InMemoryFormat.OBJECT));
        }


        cacheClient = HazelcastClient.newHazelcastClient(clientConfig);
        }
    }

    public HazelcastInstance getCacheClient(){
        return cacheClient;
    }

    public Map get(String cacheName) {

        Map cacheMap = cacheClient.getMap(cacheName);

    if (nearcaches.contains(cacheName)) {

            NearCacheStats stats = ((IMap) cacheMap).getLocalMapStats()
                    .getNearCacheStats();
            logger.info("Near Cache HITS for map " + cacheName + "  ::"
                    + stats.getHits());
        }


        return cacheMap;
    }


}