redis cluster jedis client 示例

redis cluster 基本的redis操作示例:

 

JedisCluster jc =  null ;
    @Before
    public  void  before(){
        Set<HostAndPort> jedisClusterNodes =  new  HashSet<HostAndPort>();
        //Jedis Cluster will attempt to discover cluster nodes automatically
        jedisClusterNodes.add( new  HostAndPort( "127.0.0.1" ,  7000 ));
        jc =  new  JedisCluster(jedisClusterNodes);
    }
    @Test
    public  void  test_incr(){

        String key =  "page_view" ;
        jc.del(key);
        jc.incr(key);
        String result = jc.get(key);
        System.out.println(result);
        Assertions.assertThat(result).isEqualTo( 1 + "" );
    }
    @Test
    public  void  test_setAndGetStringVal(){
        String key =  "foo" ;
        String value =  "bar" ;
        jc.set(key, value);
        String result = jc.get(key);
        System.out.println(result);
        Assertions.assertThat(result).isEqualTo(value);
    }
    @Test
    public  void  test_setAndGetStringVal_and_set_expire()  throws  InterruptedException{
        String key =  "hello" ;
        String value =  "world" ;
        int  seconds =  3 ;
        jc.setex(key, seconds , value);
        String result = jc.get(key);
        System.out.println(result);
        Assertions.assertThat(result).isEqualTo(value);
        Thread.sleep(seconds* 1000 );
        result = jc.get(key);
        System.out.println(result);
        Assertions.assertThat(result).isNull();

    }
    @Test
    public  void  test_setAndGetHashVal(){

        String key =  "website" ;
        String field=  "google" ;
        String value =  "google.com" ;
        jc.del(key);
        jc.hset(key, field, value);
        String result = jc.hget(key, field);
        System.out.println(result);
        Assertions.assertThat(result).isEqualTo(value);
    }
    @Test
    public  void  test_setAndGetListVal(){

        String key =  "mylist" ;
        jc.del(key);
        String[] vals = { "a" , "b" , "c" };
        jc.rpush(key, vals);
        List<String> result = jc.lrange(key,  0 , - 1 );
        System.out.println(result);
        Assertions.assertThat(result).containsExactly(vals);
    }
    @Test
    public  void  test_setAndGetSetVal(){

        String key =  "language" ;
        jc.del(key);
        String[] members = { "java" ,  "ruby" ,  "python" };
        jc.sadd(key, members);
        Set<String> result = jc.smembers(key);
        System.out.println(result);
        Assertions.assertThat(result).containsOnly(members);
    }

 

演示主从切换时的jedis操作情景:

 

JedisCluster jc =  null ;
    @Before
    public  void  before(){
        Set<HostAndPort> jedisClusterNodes =  new  HashSet<HostAndPort>();
        //Jedis Cluster will attempt to discover cluster nodes automatically
        jedisClusterNodes.add( new  HostAndPort( "127.0.0.1" ,  7000 ));
        jc =  new  JedisCluster(jedisClusterNodes);
    }
    /**
     * 在一个无限循环中不停的读写
     * @throws InterruptedException
     */
    @Test
    public  void  setAndWriteStringValueRepeatedly()  throws  InterruptedException{
        String key =  "test_oper_during_failover" ;
        jc.del(key);
        long  failureTime =  0 ;
        long  recoveryTime =  0 ;
        while ( true ){
            try  {
                String result = jc.get(key);
                if (failureTime !=  0  && recoveryTime== 0 ){
                    recoveryTime =  System.currentTimeMillis();
                    System.out.println( "Cluster is recovered! Downtime lasted " +(recoveryTime-failureTime)+ " ms" );
                }

                System.out.println(result);
                jc.set(key, System.currentTimeMillis()+ "" );

            }  catch  (Exception e) {
                if (failureTime== 0 )
                    failureTime=System.currentTimeMillis();
                e.printStackTrace();
            }
            Thread.sleep( 1000 );
        }

    }

 

输出：

 

null
1430663109857
1430663110860
......
redis.clients.jedis.exceptions.JedisClusterMaxRedirectionsException: Too many Cluster redirections?
    at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java: 37 )
    at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java: 70 )
    ...
...
redis.clients.jedis.exceptions.JedisClusterException: CLUSTERDOWN The cluster is down
    at redis.clients.jedis.Protocol.processError(Protocol.java: 111 )
    at redis.clients.jedis.Protocol.process(Protocol.java: 138 )
    ...
Cluster is recovered! Downtime lasted  7089  ms
1430663137897
1430663146602
...

 

pom.xml:

 

< properties >
        < junit.version >4.11</ junit.version >
        < assertj.version >1.7.0</ assertj.version >
    </ properties >
    < dependencies >
        < dependency >
            < groupId >redis.clients</ groupId >
            < artifactId >jedis</ artifactId >
            < version >2.6.2</ version >
        </ dependency >
        < dependency >
            < groupId >junit</ groupId >
            < artifactId >junit</ artifactId >
            < version >${junit.version}</ version >
            < scope >test</ scope >
        </ dependency >
        <!-- assertj -->
        < dependency >
            < groupId >org.assertj</ groupId >
            < artifactId >assertj-core</ artifactId >
            < version >${assertj.version}</ version >
            < scope >test</ scope >
        </ dependency >
    </ dependencies >

 

参考:

 

https://github.com/xetorthio/jedis

 

 

问题：

 

1.  hostandport 只需要指定一个 host ip和端口？其他的都直接由rediscluster去获取是吧？

    

   摘自http://redis.io/topics/cluster-tutorial

   此段话是针对ruby client的， 但是我想应该也适用于jedis。

 

?

1 2 3 4 5 6

3 startup_nodes = [ 4 {:host => "127.0.0.1", :port => 7000}, 5 {:host => "127.0.0.1", :port => 7001} 6 ] The startup nodes don't need to be all the nodes of the cluster. The important thing is that at least o

http://my.oschina.net/zhuguowei/blog/411077