jedis - Could not get a resource from the pool

[박종현]

Hi, I'm using Jedis from a multi threaded environment and I'm getting this error code

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool

at redis.clients.util.Pool.getResource(Pool.java:53)

at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226)

at HelloRedis.<init>(HelloRedis.java:22)

at HelloRedis.main(HelloRedis.java:38)

Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect

at redis.clients.jedis.Connection.connect(Connection.java:207)

at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)

at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)

at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)

at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868)

at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435)

at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)

at redis.clients.util.Pool.getResource(Pool.java:49)

... 3 more

Caused by: java.net.ConnectException: Connection refused: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)

at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)

at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)

at java.net.AbstractPlainSocketImpl.connect(Unknown Source)

at java.net.PlainSocketImpl.connect(Unknown Source)

at java.net.SocksSocketImpl.connect(Unknown Source)

at java.net.Socket.connect(Unknown Source)

at redis.clients.jedis.Connection.connect(Connection.java:184)

... 10 more

Here is my Jedis test code.

import java.util.ArrayList;

import redis.clients.jedis.Jedis;

import redis.clients.jedis.JedisPool;

import redis.clients.jedis.JedisPoolConfig;

public class HelloRedis implements Runnable{

int seq;

Jedis jedis;

static JedisPool pool;

static JedisPoolConfig config;

String str = "@";

        public HelloRedis(int seq){

this.seq = seq;

this.jedis = pool.getResource();

}

public static void main(String args[]) {

config = new JedisPoolConfig();

config.setMaxTotal(1000000);

config.setMaxIdle(1000000);

pool = new JedisPool(config, "localhost", 6379, 0);

long startTime = System.currentTimeMillis(); 

ArrayList<Thread> threads = new ArrayList<Thread>();

for(int i=0; i<100000; i++) {

                      Thread t = new Thread(new HelloRedis(i));

                      t.start();

                      threads.add(t);

                }

for(int j = 0; j<threads.size(); j++){

Thread t = threads.get(j);

try{

t.join();

}catch(Exception e){

e.printStackTrace();

}

}

long endTime = System.currentTimeMillis(); 

System.out.println(":::::::::"+(endTime-startTime));

}

@Override

public void run() {

for(int i=0; i < 10000; i++){

jedis.set(seq+"key"+i, i+str);

}

jedis.close();

}

}

I set the number of maxclients is 10,000,000 in redis.conf file. 

I wonder why this code occur error although I set that Jedis pool size is bigger than the number of threads.

I'm using Redis 3.2.1, Jedis 2.9.0 and commons-pool2 2.4.2

[CharSyam]

Did you run redis server?

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[박종현]

Yes. I run redis server in windows

2016년 11월 15일 화요일 오후 5시 4분 47초 UTC+9, CharSyam 님의 말:

[CharSyam]

Please check like below.
1] just try to connect your redis server, is it OK?

2] set below and test again.
1. set maxclient just as 1024 for test
2. set config.setMaxTotal(100);
3. set config.setMaxIdle(100);

[박종현]

Thank you! It runs well when I set 2]. 

By the way, why did this code occur the error when maxclient, setMaxTotal and setMaxIdle are high values?

2016년 11월 15일 화요일 오후 6시 5분 44초 UTC+9, CharSyam 님의 말:

[CharSyam]

It depens on operating systems. :)
Because of Open File Descriptor or just over spending of socket(you
can just use maximum 65535 clients)