Memcached

Sources: https://memcached.org/, http://libevent.org/

Building from source requires libevent module. which is an event notification library.

yum install memcached #install on Redhat(centos, fedora...)

apt-get install memcached #install on Ubuntu, debians..

memcached -u hadoop & # starts memcache in background as a non-root user "hadoop"

memcached <HOST>:11211 stats #shows stats.

memcached <HOST>:11211 display #shows slabs. or without display.

memcached <HOST>:11211 dump #dumps keys and values.

Java Clilent: #dependencies in build.gradle are : compile 'net.spy:spymemcached:2.9.1'

import java.io.IOException;

import java.net.InetSocketAddress;

import net.spy.memcached.MemcachedClient;

public class MemcacheClient {

    public static void main(String[] args) throws IOException {

        MemcachedClient client = new MemcachedClient(new InetSocketAddress("pig", 11211));

        System.out.println(client.getStats());

        client.shutdown();

    }

}

#once client is initialized, it can be used as simple Map. set(String key, int Age[timestamp or seconds from now], Object anything) to store and get(String key) to fetch. Note any object that implement Serialzable interface can be set or get to or from memcached store. Happy coding...