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("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");

        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("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");

    }

}

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:

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。。

巴特西

redis在应用中使用连接不释放问题解决

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