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。

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();
jedisConfig.setMaxActive(2);
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();
}
}
}

转载自：<a href="http://www.iteye.com/topic/1122212">http://www.iteye.com/topic/1122212</a>

摘抄自：http://blog.csdn.net/freebird_lb/article/details/7460328

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