日期:2014-05-16  浏览次数:20517 次

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);
        confi