How Jedis Pool works?

Question

I'm using Jedis pool to manage connections to Redis server. An example code of mine as follows:

public Set<String> getTopArticleList(int start, int end) {     Set<String> list = null;     Jedis j = JedisFactory.getInstance().getJedisPool().getResource();     Pipeline pipe = j.pipelined();     try {         // do stuff with redis         pipe.sync();     } catch (JedisConnectionException jex) {         JedisFactory.getInstance().getJedisPool().returnBrokenResource(j);     } finally {         JedisFactory.getInstance().getJedisPool().returnResource(j);     }     return list; } 

Code to create and retrieve the Jedis pool:

class JedisFactory {     private static JedisPool jedisPool;     public JedisFactory() {         JedisPoolConfig poolConfig = new JedisPoolConfig();         jedisPool = new JedisPool(             poolConfig,             RedisDBConfig.HOST,             RedisDBConfig.PORT,             RedisDBConfig.TIMEOUT,             RedisDBConfig.PASSWORD         );     }      public JedisPool getJedisPool() {         return jedisPool;     }      public static JedisFactory getInstance() {         if (instance == null) {             instance = new JedisFactory();         }         return instance;     }  }             

The problem is that after reaching the number of limited connections, the web cannot be accessed anymore. Am I doing something wrong?

Answer 1

You haven't configured the maxTotal size of the pool, and the default value is only 8. You could change the JedisFactory constructor to:

     public JedisFactory() {         JedisPoolConfig poolConfig = new JedisPoolConfig();         poolConfig.setMaxTotal(128);         jedisPool = new JedisPool(poolConfig, RedisDBConfig.HOST, RedisDBConfig.PORT, RedisDBConfig.TIMEOUT, RedisDBConfig.PASSWORD);     } 

Beware also of the default value of the WhenExhaustedAction (WHEN_EXHAUSTED_BLOCK), as it may not be your desired behavior.

Jedis uses Apache Commons Pool, and you can read about it's parameters here: GenericObjectPool