jedispool 连 redis 高并发卡死

上一篇 / 下一篇  2018-02-11 16:12:06 / 个人分类:JMeter

https://www.2cto.com/kf/201504/395403.html


java端在使用jedispool 连接redis的时候,在高并发的时候经常卡死,或报连接异常,JedisConnectionException,或者getResource 异常等各种问题

在使用jedispool 的时候一定要注意两点

1。 在获取 jedisPool和jedis的时候加上线程同步,保证不要创建过多的jedispool 和 jedis

2。 用完Jedis实例后需要返还给JedisPool

整理了一下redis工具类,通过大量测试和高并发测试的

packagecom.caspar.util;
 
importorg.apache.log4j.Logger;
 
importredis.clients.jedis.Jedis;
importredis.clients.jedis.JedisPool;
importredis.clients.jedis.JedisPoolConfig;
 
/**
 * Redis 工具类
 * @author caspar
 */
publicclassRedisUtil {
     
    protectedstaticLogger logger = Logger.getLogger(RedisUtil.class);
     
    //Redis服务器IP
    privatestaticString ADDR_ARRAY = FileUtil.getPropertyValue("/properties/redis.properties","server");
     
    //Redis的端口号
    privatestaticintPORT = FileUtil.getPropertyValueInt("/properties/redis.properties","port");
     
    //访问密码
//    private static String AUTH = FileUtil.getPropertyValue("/properties/redis.properties", "auth");
     
    //可用连接实例的最大数目,默认值为8;
    //如果赋值为-1,则表示不限制;如果pool已经分配了maxActive个jedis实例,则此时pool的状态为exhausted(耗尽)。
    privatestaticintMAX_ACTIVE = FileUtil.getPropertyValueInt("/properties/redis.properties","max_active");;
     
    //控制一个pool最多有多少个状态为idle(空闲的)的jedis实例,默认值也是8。
    privatestaticintMAX_IDLE = FileUtil.getPropertyValueInt("/properties/redis.properties","max_idle");;
     
    //等待可用连接的最大时间,单位毫秒,默认值为-1,表示永不超时。如果超过等待时间,则直接抛出JedisConnectionException;
    privatestaticintMAX_WAIT = FileUtil.getPropertyValueInt("/properties/redis.properties","max_wait");;
 
    //超时时间
    privatestaticintTIMEOUT = FileUtil.getPropertyValueInt("/properties/redis.properties","timeout");;
     
    //在borrow一个jedis实例时,是否提前进行validate操作;如果为true,则得到的jedis实例均是可用的;
    privatestaticbooleanTEST_ON_BORROW = FileUtil.getPropertyValueBoolean("/properties/redis.properties","test_on_borrow");;
     
    privatestaticJedisPool jedisPool =null;
     
    /**
     * redis过期时间,以秒为单位
     */
    publicfinalstaticintEXRP_HOUR =60*60;         //一小时
    publicfinalstaticintEXRP_DAY =60*60*24;       //一天
    publicfinalstaticintEXRP_MONTH =60*60*24*30;  //一个月
     
    /**
     * 初始化Redis连接池
     */
    privatestaticvoidinitialPool(){
        try{
            JedisPoolConfig config =newJedisPoolConfig();
            config.setMaxTotal(MAX_ACTIVE);
            config.setMaxIdle(MAX_IDLE);
            config.setMaxWaitMillis(MAX_WAIT);
            config.setTestOnBorrow(TEST_ON_BORROW);
            jedisPool =newJedisPool(config, ADDR_ARRAY.split(",")[0], PORT, TIMEOUT);
        }catch(Exception e) {
            logger.error("First create JedisPool error : "+e);
            try{
                //如果第一个IP异常,则访问第二个IP
                JedisPoolConfig config =newJedisPoolConfig();
                config.setMaxTotal(MAX_ACTIVE);
                config.setMaxIdle(MAX_IDLE);
                config.setMaxWaitMillis(MAX_WAIT);
                config.setTestOnBorrow(TEST_ON_BORROW);
                jedisPool =newJedisPool(config, ADDR_ARRAY.split(",")[1], PORT, TIMEOUT);
            }catch(Exception e2){
                logger.error("Second create JedisPool error : "+e2);
            }
        }
    }
     
     
    /**
     * 在多线程环境同步初始化
     */
    privatestaticsynchronizedvoidpoolInit() {
        if(jedisPool ==null) { 
            initialPool();
        }
    }
 
     
    /**
     * 同步获取Jedis实例
     * @return Jedis
     */
    publicsynchronizedstaticJedis getJedis() { 
        if(jedisPool ==null) { 
            poolInit();
        }
        Jedis jedis =null;
        try
            if(jedisPool !=null) { 
                jedis = jedisPool.getResource();
            }
        }catch(Exception e) { 
            logger.error("Get jedis error : "+e);
        }finally{
            returnResource(jedis);
        }
        returnjedis;
    
     
     
    /**
     * 释放jedis资源
     * @param jedis
     */
    publicstaticvoidreturnResource(finalJedis jedis) {
        if(jedis !=null&& jedisPool !=null) {
            jedisPool.returnResource(jedis);
        }
    }
     
     
    /**
     * 设置 String
     * @param key
     * @param value
     */
    publicstaticvoidsetString(String key ,String value){
        try{
            value = StringUtil.isEmpty(value) ?"": value;
            getJedis().set(key,value);
        }catch(Exception e) {
            logger.error("Set key error : "+e);
        }
    }
     
    /**
     * 设置 过期时间
     * @param key
     * @param seconds 以秒为单位
     * @param value
     */
    publicstaticvoidsetString(String key ,intseconds,String value){
        try{
            value = StringUtil.isEmpty(value) ?"": value;
            getJedis().setex(key, seconds, value);
        }catch(Exception e) {
            logger.error("Set keyex error : "+e);
        }
    }
     
    /**
     * 获取String值
     * @param key
     * @return value
     */
    publicstaticString getString(String key){
        if(getJedis() ==null|| !getJedis().exists(key)){
            returnnull;
        }
        returngetJedis().get(key);
    }
     
}



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