比如，我们给kafka的topic命名为user_r2p10
表示user这个topic的副本因子（r）是2，分区数（p）是10。
这样后期在写消费者代码的时候，根据topic名称就知道分区有多少个，可以很方便的设置多少个消费者线程。
比如，如下
前期博客，见
然后，
创建topic
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[hadoop@master kafka_2.10-0.9.0.1]$ pwd
/home/hadoop/app/kafka_2.10-0.9.0.1
[hadoop@master kafka_2.10-0.9.0.1]$ ll
total 128
drwxr-xr-x 3 hadoop hadoop 4096 Jul 27 17:56 bin
drwxr-xr-x 2 hadoop hadoop 4096 Jul 27 19:16 config
-rw-rw-r-- 1 hadoop hadoop 19520 Jul 28 19:57 kafka.log
drwxr-xr-x 2 hadoop hadoop 4096 Jul 27 17:26 libs
-rw-r--r-- 1 hadoop hadoop 11358 Feb 12 2016 LICENSE
drwxrwxr-x 2 hadoop hadoop 4096 Jul 28 19:56 logs
-rw------- 1 hadoop hadoop 67054 Jul 27 23:28 nohup.out
-rw-r--r-- 1 hadoop hadoop 162 Feb 12 2016 NOTICE
drwxr-xr-x 2 hadoop hadoop 4096 Feb 12 2016 site-docs
[hadoop@master kafka_2.10-0.9.0.1]$ bin/kafka-topics.sh --zookeeper master:2181,slave1:2181,slave2:2181 --create --topic gold_log_r2p5 --replication-factor 2 --partitions 5
WARNING: Due to limitations in metric names, topics with a period ('.') or underscore ('_') could collide. To avoid issues it is best to use either, but not both.
Created topic "gold_log_r2p5".
[hadoop@master kafka_2.10-0.9.0.1]$
[hadoop@master kafka_2.10-0.9.0.1]$
