redis Could not get a resource

场景：Redis一个错误的解决方法，错误描述：Could not get a resource from the pool

Redis一个异常的解决办法，异常描述：Could not get a resource from the pool
异常描述：

redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
	at redis.clients.util.Pool.getResource(Pool.java:22)
	at com.derbysoft.jredis.longkeytest.BorrowObject.run(BorrowObject.java:22)
	at java.lang.Thread.run(Thread.java:662)
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
	at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1134)
	at redis.clients.util.Pool.getResource(Pool.java:20)
	... 2 more

1、产生原因：客户端去redis服务器拿连接（代码描述的是租用对象borrowObject）的时候，池中无可用连接，即池中所有连接被占用，且在等待时候设定的超时时间后还没拿到时，报出此异常。

2、解决办法：调整JedisPoolConfig中maxActive为适合自己系统的阀值。

<bean id="dataJedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        [color=red]<property name="maxActive" value="5000"/>[/color]
        <property name="maxIdle" value="5000"/>
        <property name="maxWait" value="10000"/>
        <property name="testOnBorrow" value="true"/>
</bean>

3、重现：

public class BorrowObject implements Runnable {
    private ShardedJedisPool jedisPool;

    public BorrowObject(ShardedJedisPool jedisPool) {
        this.jedisPool = jedisPool;
    }

    @Override
    public void run() {
        ShardedJedis shardedJedis = null;
        try {
            shardedJedis = jedisPool.getResource();
            String value = shardedJedis.hget("LONG_KEY_TEST:AA059E03E0AB7D806E6C351F87404B06C1190", "Roc El Pinar Aparthotel");
            System.out.println(value);
        } catch (Exception e) {
            //logger.error(e);
            e.printStackTrace();
        } finally {
            jedisPool.returnResource(shardedJedis);
        }
    }
}

public class BorrowObjectTest {
    private ShardedJedisPool jedisPool = null;

    public BorrowObjectTest() {
        List<JedisShardInfo> jedisShardInfos = new ArrayList<JedisShardInfo>();
        JedisShardInfo jedisShardInfo = new JedisShardInfo("192.168.1.112");
        jedisShardInfo.setTimeout(1000000);
        jedisShardInfos.add(jedisShardInfo);
        jedisPool = new ShardedJedisPool(createJedisConfig(), jedisShardInfos);
    }

    private JedisPoolConfig createJedisConfig() {
        JedisPoolConfig jedisConfig = new JedisPoolConfig();
        [color=red]jedisConfig.setMaxActive(2);[/color]
        jedisConfig.setMaxIdle(2);
        jedisConfig.setMaxWait(5);
        jedisConfig.setTestOnBorrow(true);
        return jedisConfig;
    }

    public static void main(String[] args) {
        BorrowObjectTest borrowObjectTest = new BorrowObjectTest();
        for (int i = 0; i < 300; i++) {
            new Thread(new BorrowObject(borrowObjectTest.jedisPool)).start();
        }
    }
}

1 楼 dilaomi123 2012-05-07

你好~~~看了您的文章收益匪浅，我也遇到类似的问题，但是我设置了阀值以后，同时跑5000个线程去取数据，还是报同样的错误，非常郁闷.还请不吝啬赐教，不胜感激

package com.sz7road.web.action.online.user;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class JedisFactory {

    private static JedisPool jedisPool;

    public JedisFactory() {
        super();
    }

    static {
        JedisPoolConfig config = new JedisPoolConfig();
        config.setMaxActive(50000);
        config.setMaxIdle(10000);
        config.setMaxWait(10000);
        config.setTestOnBorrow(true);

        jedisPool = new JedisPool(config, "XXX.XXX.XXX.XXX",6379,10000);
    }

    public Jedis getJedisInstance() {
    Jedis jedis = jedisPool.getResource();
    //jedis.auth("love7road");
        return jedis;
    }

import java.util.UUID;

import redis.clients.jedis.Jedis;

/**
* @Company:www.shopin.net User: minxr
* Date: 11-9-9
* Time: 下午5:44
*/
public class Test {

public void testThread() {

long begin = System.currentTimeMillis();

Thread thread[] = new Thread[5000];
for (int i = 0; i < thread.length; i++) {
thread[i] = new TestThread();
thread[i].start();
}

long end = System.currentTimeMillis();
System.out.println("线程执行时间是：" + (end - begin) + " ms");

}

public void insertActiveCode() {
JedisFactory factory = new JedisFactory();
Jedis jedis = factory.getJedisInstance();
//先向key java framework中存放三条数据
for (int i = 0; i < 10000; i++) {
jedis.rpush("activeCode", UUID.randomUUID().toString());
}
factory.release(jedis);
}

public static void main(String args[]) {
Test test = new Test();
test.insertActiveCode();
test.testThread();
}

class TestThread extends Thread {

@Override
public void run() {
JedisFactory factory = new JedisFactory();
Jedis jedis = factory.getJedisInstance();
String code = jedis.rpop("activeCode");
System.out.println("激活码：" + code);
System.out.println("长度：" + jedis.llen("activeCode"));
System.out.println("#############################");
factory.release(jedis);
}

}

}

    /**
     * 配合使用getJedisInstance方法后将jedis对象释放回连接池中
     *
     * @param jedis 使用完毕的Jedis对象
     * @return true 释放成功；否则返回false
     */
    public boolean release(Jedis jedis) {
        if (jedisPool != null && jedis != null) {
            jedisPool.returnResource(jedis);
            return true;
        }
        return false;
    }

}

2 楼 dilaomi123 2012-05-07

还有个问题，ShardedJedisPool 这个是如何用的？哪里有对应的资料啊，兄弟，我急需！非常感谢

3 楼 dilaomi123 2012-05-07

我的qq：11210999
希望能获得您的帮助！

4 楼 lhc1002 2012-05-16

楼上哥们，我按LZ描述所说的对阀门进行了设置，线程只要超过100也会报Could not get a resource from the pool ，这个问题你解决了吗？还望指教。

5 楼 jiasky 2012-05-16

dilaomi123 写道

我也比较懊恼，我做了调整之后，经测试偶尔也会出现此异常。

6 楼 jiasky 2012-05-16

dilaomi123 写道

还有个问题，ShardedJedisPool 这个是如何用的？哪里有对应的资料啊，兄弟，我急需！非常感谢

而且我新增了一个redis实例之后问题依旧，初步怀疑是redis server的实现bug.

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