Redis 2.8 Client Application (Jedis), Jedis Shard

1 RedisClient Applications (Jedis),JedisShards1.1   What isJedis?

Jedis is a client-side technology for Java to connect to a Redis server, which is equivalent to connecting a database with JDBC . ( JDBC is required to connect to MySQL, and Jedis is required to connect with Redis)

1.2   JedisClient ConnectionsRedisCaching Steps1.2.1  The first way to create a project:

a) Download Jedis jar Package: The official website Www.redis.io is based on maven's simplest configuration to obtain a redis dependent jar package.

The official website provides the following methods:

1) Configure maven configuration in Pom.xml: Find dependent jar packages based on configuration

<dependencies> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.6.2</version> <type>jar</type> <scope>compile</scope> </dependency> </dependencies>

2) use Java code to manipulate Redis server

Jedis Jedis = new Jedis ("192.168.13.129", 6379); Jedis.set ("String_key01", "Today is a good day"); String s = jedis.get ("String_key01"); System.out.print (s); Jedis.close ();

II)Jedis Connection Pool application

1) Create Jedis Connection Pool Configuration object:jedispoolconfigconfig = new Jedispoolconfig ();

2) Set configuration parameters:

Config.setmaxidle (1000*60); Config.setmaxtotal (8); Config.settestonborrow (ture);

3) Create a connection pool object from the Configuration object:

Jedispool pool = new Jedispool ( config, "192.168.13.129", 6379 ) ;

4) Get the Jedis object through the pool object and manipulate the Redis

Jedis JDS = Pool.getresource (); Jds.set ("name", "Zhangsan"); String name = Jds.get ("name"); System.out.print (name);

1.2.2  The second way to create a project:

1) Import the dependent jar Package

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2) use Java code to operate Redis Server (IBID.)

Jedis Jedis = new Jedis ("192.168.13.129", 6379); Jedis.set ("String_key01", "Today is a good day"); String s = jedis.get ("String_key01"); System.out.print (s); Jedis.close ();

1.3   JedisShards1.3.1  What is a shard:

when a redis server is unable to load high-concurrency pressures, we need multiple servers to share the appropriate pressure.

Figure 1.

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Figure 2.

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1.3.2   JedisShard Operations

The first step: Configure more than one Redis Server: Because it is inconvenient to configure multiple Redis servers, use the copy configuration file, modify the port to template the second redis server;

There's already one , copy redis.conf Modify the port number 6380 as the second server

Step Two: Create Shards Jedis Connection Pool object:shardedjedispool

1) It requires three parameters:1. configuration parameters, 2. multiple Redis Server information parameters,3. algorithm parameters.

jedispoolconfig poolconfig = newjedispoolconfig(); Poolconfig.setmaxtotal (500); Poolconfig.setmaxidle (1000 * 60); Poolconfig.settestonborrow (true); list<jedisshardinfo> shards = new arraylist<jedisshardinfo> (2); Jedisshardinfo A = new jedisshardinfo ("192.168.13.111", 6379); Jedisshardinfo B = new jedisshardinfo ("192.168.13.111", 6380); Shards.add (A); Shards.add (B); ShardedjedispoolPool = new shardedjedispool (Poolconfig, Shards, Hashing. Murmur_hash);

2) Get the Jedis object and simulate the request to test how the resource is allocated.

Private Static int Index = 1; &NBSP; public static void main (string[] args) { for(int i=0; i<100; i++) { String key =string. valueOf (Index+ +); Shardedjedis JDS = NULL ; Try { JDS = Pool . getresource (); System. out . println (key+":"+jds.getshard (key). Getclient (). Getport ());                           system. out .println (Jds.set (Key, " 1111111111111111111111111111111 " )) ; }catch (Exception e) { E.printstacktrace (); } finally{ Pool. Returnresource (JDS); } } }

3) Summary: No need to care about which server the data is saved to, get the data without specifying the server, all by Hashing. Murmur_hash to be responsible.

1.4   JedisClient cannot connectRedisServer

l Check that the Redis server IP address and port number are correct;

l Check whether the Redis server is setting the client access password:jedis.auth ("123456");

l Check If the Inux firewall is off

l Linux Shutdown Firewall command step:

Permanent, no recovery after reboot

¨       Open:chkconfig iptables on

¨       off:chkconfig iptables off

Immediate effect, recovery after reboot

¨       Open:service iptables start

¨       Close:service iptables stop

Redis 2.8 Client Application (Jedis), Jedis Shard