redis在应用中使用连接不释放问题解决

今天测试，发现redis使用的时候，调用的链接一直不释放。后查阅蛮多资料，才发现一个配置导致的。并不是他们说的服务没有启动导致的。

1）配置文件

#redis连接配置===================start=========================
# Redis settings
redis.host=192.168.10.102
redis.port=6379
redis.pass=
redis.maxIdle=1
redis.maxActive=9
redis.maxWait=1000
redis.testOnBorrow=true
#redis连接配置===================end=========================
<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"  
    xmlns:aop="http://www.springframework.org/schema/aop"  
    xsi:schemaLocation="  
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd  
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">  
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}" />
        <property name="maxTotal" value="${redis.maxActive}" />
        <property name="maxWaitMillis" value="${redis.maxWait}" />
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />
    </bean>
    <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="poolConfig" ref="poolConfig" /> 
         <property name="port" value="${redis.port}" /> 
         <property name="hostName" value="${redis.host}" /> 
         <property name="password" value="${redis.pass}" /> 
        </bean>
    <bean id="stringSerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer"/>    
    <bean id="jdkSerializationRedisSerializer" class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/>    
    <bean id="stringRedisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
        <property name="connectionFactory" ref="jedisConnectionFactory" />
        <property name="keySerializer" ref="stringSerializer" />
        <property name="valueSerializer" ref="jdkSerializationRedisSerializer"/>
        <property name="enableTransactionSupport" value="true"/>
    </bean>
    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="jedisConnectionFactory" />
        <property name="keySerializer" ref="stringSerializer" />
        <property name="valueSerializer" ref="jdkSerializationRedisSerializer"/>
    </bean>
</beans>

2）测试例子

写了一个springmvc的controller类，然后调用线程使用连接，出现问题。

DemoMvcController.java

package com.iafclub.demo.web.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.iafclub.baseTools.util.MyDateUtil;

@Controller
public class DemoMvcController {
    
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 跳转方式3
     * */
    @RequestMapping("/testRedis.do")
    public void testRedis(Model model, HttpServletRequest request){

        System.out.println("














");
        for(int i=0;i<5;i++){
            Thread thread = new RedisThread(stringRedisTemplate);
            thread.setName("线程：" + i);
            thread.start();
        }
        model.addAttribute("status", "完成"+MyDateUtil.getCurrentDateTimeStr());
        System.out.println("完成");
        System.out.println("














");
    
    }
}

RedisThread.java线程类

package com.iafclub.demo.web.controller;

import org.junit.runner.RunWith;
import org.springframework.data.redis.core.BoundValueOperations;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.iafclub.baseTools.util.MyDateUtil;

@RunWith(SpringJUnit4ClassRunner.class)
public class RedisThread extends Thread {
    private StringRedisTemplate redisTemplate;
    
    private String REVERSE_KEY = "batchJob:task_";

    public RedisThread(StringRedisTemplate redisTemplate){
        this.redisTemplate = redisTemplate;
    }
    
    @Override
    public void run() {
        // 其实这里使用了多次，但是使用的也都是一个链接
        for(int i=0;i<50;i++){
            String value = Thread.currentThread().getName() + "{user:user"+MyDateUtil.getCurrentDateTimeStr()+";name:chenweixian"+System.currentTimeMillis()+"}";
            redisTemplate.opsForValue().set(REVERSE_KEY+System.currentTimeMillis(), value);
            redisTemplate.getConnectionFactory().getConnection().close();
//            BoundValueOperations<String, String> opt = redisTemplate.boundValueOps(REVERSE_KEY+System.currentTimeMillis());
//            opt.set(value);
//            System.out.println(opt.get());
        }
        System.out.println("完成");
    }
    
}

启动应用，访问链接：http://chenweixian-pc:8480/demo-system/testRedis.do，多刷新几次

出现问题异常：Cannot get Jedis connection

Exception in thread "线程：3" org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
    at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:162)
    at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:251)
    at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.getConnection(JedisConnectionFactory.java:58)
    at com.iafclub.demo.web.controller.RedisThread.run(RedisThread.java:26)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
    at redis.clients.util.Pool.getResource(Pool.java:50)
    at redis.clients.jedis.JedisPool.getResource(JedisPool.java:88)
    at redis.clients.jedis.JedisPool.getResource(JedisPool.java:12)
    at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.fetchJedisConnector(JedisConnectionFactory.java:155)
    ... 3 more
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:442)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:360)
    at redis.clients.util.Pool.getResource(Pool.java:48)
    ... 6 more

3）查看链接数

通过客户端工具到服务器去查询当前连接数:当前10个

[root@dev2 bin]# ./redis-cli info clients
# Clients
connected_clients:10
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0

4）分析问题 

因为我们设置最初的连接数最大是9个，加上我自己通过客户端访问连接数10个，理论上应该释放才对，这里没有释放，是有问题的。因为这个链接应该是与数据库链接一样，会释放，才能长久。。。

间隔很久访问，依旧是10个。没有释放。一旦有httprequest请求发出来，错误依旧是：没有取到链接。

Exception in thread "线程：3" org.springframework.data.redis.RedisConnectionFailureException: Cannot get Jedis connection; nested exception is redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool

5）修改配置

经过反复查找属性，最终在配置文件中发现一个配置，是事务处理的，网上查询得知，如果启动了redis中的事务管理，必须使用mul和execute执行后才能生效。而我们这里没有使用这个事务。so去掉这个配置。

    <bean id="stringRedisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
        <property name="connectionFactory" ref="jedisConnectionFactory" />
        <property name="keySerializer" ref="stringSerializer" />
        <property name="valueSerializer" ref="jdkSerializationRedisSerializer"/>
        <property name="enableTransactionSupport" value="true"/>
    </bean>

6）重新测试

重新部署，启动，多次刷新后连接数都没有出现无法获取的异常，很正常。

# Clients
connected_clients:1
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0

7)问题解决

总结：这个配置项，需要注意。。

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原文地址：https://www.cnblogs.com/a393060727/p/5281950.html