setup redis overcommit_memory

Setup Redis

1 - Make sure to set the Linux kernel overcommit memory setting to 1. Add vm.overcommit_memory = 1 to /etc/sysctl.conf and then reboot or run the command sysctl vm.overcommit_memory=1 for this to take effect immediately.

2 - Make sure to setup some swap in your system (we suggest as much as swap as memory). If Linux does not have swap and your Redis instance accidentally consumes too much memory, either Redis will crash for out of memory or the Linux kernel OOM killer will kill the Redis process.

3 - Connector Configs

  final int numClients = 150;
  final JedisPoolConfig config = new JedisPoolConfig();
		
  // Tests whether connection is dead when connection retrieval method is called
  config.setTestOnBorrow(true);
        
  // Tests whether connection is dead when returning a connection to the pool
  config.setTestOnReturn(true);
  
  // Tests whether connections are dead during idle periods
  config.setTestWhileIdle(true);
  
  // Maximum active connections to Redis instance
  config.setMaxActive(numClients < 100 ? 100 : numClients);
  
  // Minimum number of idle connections to Redis - these can be seen as always open and ready to serve
  config.setMinIdle(1);

  // Number of connections to Redis that just sit there and do nothing
  config.setMaxIdle(30);
  
  // Maximum number of connections to test in each idle check
  config.setNumTestsPerEvictionRun(10);
  
  // Idle connection checking period
  config.setTimeBetweenEvictionRunsMillis(60000);

  // Fail-fast behaviour, we don't like to keep the kids waiting :)
  config.setWhenExhaustedAction(GenericObjectPool.WHEN_EXHAUSTED_FAIL);