繁体   English   中英

Jedis:无法从池中获取资源

[英]Jedis : Could not get a resource from the pool

背景

我们的应用程序使用Jedis-2.2.1并连接到Redis-2.6 ,这是我获取 jedis 资源的方法:

protected static JedisWrapper getRedisUserWrite(String UDID) {
        if (redisUserWritePools.get(0) == null) init();

        int hash = hash(UDID);
        Jedis jedis = redisUserWritePools.get(hash).getResource();
        jedis.select(dbs.get("redisUserWritePools" + hash));

        return new JedisWrapper(jedis, redisUserWritePools.get(hash));
    }

这是我的JedisWrapper (统一资源管理):

public class JedisWrapper {
    private Jedis jedis;
    private JedisPool pool;

    public JedisWrapper(Jedis jedis, JedisPool pool) {
        this.jedis = jedis;
        this.pool = pool;
    }

    public Jedis get(){
        return this.jedis;
    }

    public void returnResource() {
        if(null != this.jedis){
            this.pool.returnResource(this.jedis);
        }
    }

    public void returnBrokenResource() {
        if(null != this.jedis) {
            this.pool.returnBrokenResource(this.jedis);
        }
        this.jedis = null;
    }
}

JedisWrapper是 Jedis 实例的容器,这是我如何使用它:

private static void cacheSDKIDs(String UDID, String[] SDKIDs) {

        JedisWrapper wrapper = getRedisUserWrite(UDID);
        try {
            if (SDKIDs != null) {
                wrapper.get().del(UDID);
                wrapper.get().sadd(UDID, SDKIDs);
            }
        } catch (JedisConnectionException e) {
            e.printStackTrace();
            wrapper.returnBrokenResource();
        }catch (Exception e) {
            e.printStackTrace();
        } finally {
            wrapper.returnResource();
        }
    }

请注意, SKDIDs可能非常大(例如可能达到 8KB 的最大值)。

问题来了

每次重启我们的应用,所有redis连接都正常,但是几个小时后, Could not get a resource from the pool Exception就出来了。 并且频率越来越高,然后所有到Redis的连接都断开了,可以创建新的连接。

这是我的配置:

<bean id = "redisConfig" class="redis.clients.jedis.JedisPoolConfig">
    <property name="maxActive"  value="400" />
    <property name="maxIdle" value="100" />
    <property name="minIdle" value="20" />
    <property name="maxWait" value="4000" />
    <property name="testOnBorrow"  value="true"/>
    <property name="testOnReturn" value="true" />
  </bean>

异常堆栈跟踪:

Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
    at redis.clients.util.Pool.getResource(Pool.java:40)
    at com.xxxice.redis.BaseRedis.getRedisUserWrite(BaseRedis.java:158)
    at com.xxx.service.redis.DeviceRedis.cacheSDKIds(DeviceRedis.java:128)
    at com.xxx.redis.DeviceRedis.cacheDevice(DeviceRedis.java:65)
    at com.xxx.service.DeviceService.update(DeviceService.java:88)
    at com.xxx.controller.Devices.update(Devices.java:25)
    ... 32 more
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
    at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1174)
    at redis.clients.util.Pool.getResource(Pool.java:38)
    ... 37 more

在您的 JedisWrapper 中,Jedis 被创建为一个实例化一次的类变量。 请在getJedis方法里面声明一下,问题就解决了

检查是否有权限通过代码访问redis

暂无
暂无

声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM