========   redis   ========

1. redis setup and test : 

    1. download the package from https://redis.io/download

    2. compile source code:

        tar xzf redis-3.2.5.tar.gz

        cd redis-3.2.5

        make

    3. start redis server :

        [dy83694@retailvm1d redis-3.2.5]$ src/redis-server

        28855:C 05 Dec 00:53:54.476 # Warning: no config file specified, using the default config. In order to specify a config file use src/redis-server /path/to/redis.conf

        ..

        28855:M 05 Dec 00:53:54.485 * The server is now ready to accept connections on port 6379

    4. test redis :

        [dy83694@retailvm1d redis-3.2.5]$ src/redis-cli

        127.0.0.1:6379> set foo bar

        OK

        127.0.0.1:6379> get foo

        "bar"

        127.0.0.1:6379> 

    5. Data type in redis :

        1) String :

            redis 127.0.0.1:6379> SET name "yiibai"

            OK

            redis 127.0.0.1:6379> GET name

            "yiibai"

        2) HashMap :

            redis 127.0.0.1:6379> HMSET user:1 username yiibai password yiibai points 200

            OK

            redis 127.0.0.1:6379> HGETALL user:1

            1) "username"

            2) "yiibai"

            3) "password"

            4) "yiibai"

            5) "points"

            6) "200"

        3) List (1. The max size = 2^32 -1 = 4294967295 ; 2. sort by insert sequence)

            redis 127.0.0.1:6379> lpush tutoriallist redis

            (integer) 1

            redis 127.0.0.1:6379> lpush tutoriallist mongodb

            (integer) 2

            redis 127.0.0.1:6379> lpush tutoriallist rabitmq

            (integer) 3

            redis 127.0.0.1:6379> lrange tutoriallist 0 10

            1) "rabitmq"

            2) "mongodb"

            3) "redis"

        4) Set (delete and test : o(1))

            redis 127.0.0.1:6379> sadd tutoriallist redis

            (integer) 1

            redis 127.0.0.1:6379> sadd tutoriallist mongodb

            (integer) 1

            redis 127.0.0.1:6379> sadd tutoriallist rabitmq

            (integer) 1

            redis 127.0.0.1:6379> sadd tutoriallist rabitmq

            (integer) 0

            redis 127.0.0.1:6379> smembers tutoriallist

            1) "rabitmq"

            2) "mongodb"

            3) "redis"

    6. Redis HyperLogLog : calculate the count of element

        redis 127.0.0.1:6379> PFADD tutorials "redis"

        redis 127.0.0.1:6379> PFCOUNT tutorials

        (integer) 3

    7. subscribe and publish message

        client 1 : redis 127.0.0.1:6379> SUBSCRIBE redisChat

        client 2 : redis 127.0.0.1:6379> PUBLISH redisChat "Redis is a great caching technique"

    8. transaction

        redis 127.0.0.1:6379> MULTI

        OK

        List of commands here

        redis 127.0.0.1:6379> EXECs

    9. Redis script

        redis 127.0.0.1:6379> EVAL script numkeys key [key ...] arg [arg ...]

    10. Redis Connect between server and client

        redis 127.0.0.1:6379> AUTH "password"

        OK

        redis 127.0.0.1:6379> PING

        PONG

    11. Redis backup ( dump.rdb in the redis directory  )

        1) backup

            127.0.0.1:6379> CONFIG get dir

            1) "dir"

            2) "/user/yiibai/redis-2.8.13/src"

            127.0.0.1:6379> SAVE

            or

            127.0.0.1:6379> BGSAVE

            Background saving started

        2) recovery

            copy the dump.rdb into redis directory and restart the redis server

    12. redis security

        1) client 1 :

            127.0.0.1:6379> CONFIG set requirepass "redis"

            OK

        2) client 2 :

            127.0.0.1:6379>  CONFIG get requirepass

            (error) NOAUTH Authentication required.

            127.0.0.1:6379> auth redis

            OK

            127.0.0.1:6379>  CONFIG get requirepass

            1) "requirepass"

            2) "redis"

    13. redis performance test

        src/redis-benchmark [option] [option value]

        src/redis-benchmark -n 100000

    14. Redis connect client

        1. maxclients in redis.conf :

            127.0.0.1:6379> config get maxclients

        2. set maxclients = 100000 once server start

            src/redis-server --maxclients 100000

    15. Redis pipe

    16. Redis Partition

2. Redis jedis test

    1. java connection : JedisPool and Jedis

    2. create redis slave :

        src/redis-server --port 6380 --slaveof 127.0.0.1 6379 --masterauth  "redis"