Connection refused

[SergioMendes93]

Hello everyone, I'm running the following code to fill a Redis server quickly:

public static void main(String[] args) { 
      Jedis jedis = new Jedis(args[0], Integer.parseInt(args[1])); 
        long fiveMega = 524288000; //500mb
        long correspondentValue = 2097151; //Value to get 500mb being consumed
        long memoryRequirement = Long.parseLong(args[2],10); 

        long value = (memoryRequirement * correspondentValue) / fiveMega; 

        Pipeline pipeline = jedis.pipelined();
        for (long i = 0 ; i < value; i++) {
                pipeline.sadd("key"+i, "value");
        }
        pipeline.sync();
   } 

However sometimes I get the connection exception bellow but other times it works and I can't understand why. The ports and everything are correct.

By the way, if there is another way to fill up a redis server quickly with junk data I would appreciate to see if there is no error! Thanks for the help!

exit status 1: Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused (Connection refused)
at redis.clients.jedis.Connection.connect(Connection.java:148)
at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:75)
at redis.clients.jedis.Connection.sendCommand(Connection.java:77)
at redis.clients.jedis.BinaryClient.sadd(BinaryClient.java:325)
at redis.clients.jedis.Client.sadd(Client.java:242)
at redis.clients.jedis.PipelineBase.sadd(PipelineBase.java:474)
at redis.clients.jedis.Pipeline.sadd(Pipeline.java:8)
at fillRedis.main(fillRedis.java:32)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at redis.clients.jedis.Connection.connect(Connection.java:142)
... 7 more

[ushachar]

Hi @SergioMendes93 - You should probably ask this question on the Jedis repo page. This repository is for the Redis Dockerfile.
In any case:

• For a command line tool for quickly filling up a Redis instance see memtier_benchmark
• In order to debug your connectivity issues you should probably take a look using tcpdump....