kafka quick start
http://kafka.apache.org/quickstart
Step 1: Download the code
Download the 1.1.0 release and un-tar it.
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> tar -xzf kafka_2.11-1.1.0.tgz
> cd kafka_2.11-1.1.0
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Step 2: Start the server
Kafka uses ZooKeeper so you need to first start a ZooKeeper server if you don‘t already have one. You can use the convenience script packaged with kafka to get a quick-and-dirty single-node ZooKeeper instance.
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> bin/zookeeper-server-start.sh config/zookeeper.properties
[2013-04-22 15:01:37,495] INFO Reading configuration from: config/zookeeper.properties (org.apache.zookeeper.server.quorum.QuorumPeerConfig)
...
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Now start the Kafka server:
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> bin/kafka-server-start.sh config/server.properties
[2013-04-22 15:01:47,028] INFO Verifying properties (kafka.utils.VerifiableProperties)
[2013-04-22 15:01:47,051] INFO Property socket.send.buffer.bytes is overridden to 1048576 (kafka.utils.VerifiableProperties)
...
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Step 3: Create a topic
Let‘s create a topic named "test" with a single partition and only one replica:
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> bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
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We can now see that topic if we run the list topic command:
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> bin/kafka-topics.sh --list --zookeeper localhost:2181
test
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Alternatively, instead of manually creating topics you can also configure your brokers to auto-create topics when a non-existent topic is published to.
Step 4: Send some messages
Kafka comes with a command line client that will take input from a file or from standard input and send it out as messages to the Kafka cluster. By default, each line will be sent as a separate message.
Run the producer and then type a few messages into the console to send to the server.
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> bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test
This is a message
This is another message
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Step 5: Start a consumer
Kafka also has a command line consumer that will dump out messages to standard output.
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> bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning
This is a message
This is another message
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If you have each of the above commands running in a different terminal then you should now be able to type messages into the producer terminal and see them appear in the consumer terminal.
All of the command line tools have additional options; running the command with no arguments will display usage information documenting them in more detail.
遇到問題：
啟動失敗並提示如下錯誤：
FATAL [KafkaServer id=0] Fatal error during KafkaServer startup. Prepare to shutdown (kafka.server.KafkaServer)nager)999) by writing to Zk with path version 2 (kafka.coordinator.java.net.UnknownHostException: server38: server38: 未知的名稱或服務
at java.base/java.net.InetAddress.getLocalHost(Unknown Source)
at kafka.server.KafkaHealthcheck$$anonfun$1.apply(KafkaHealthcheck.scala:63)
at kafka.server.KafkaHealthcheck$$anonfun$1.apply(KafkaHealthcheck.scala:61)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
at scala.collection.AbstractTraversable.map(Traversable.scala:104)
at kafka.server.KafkaHealthcheck.register(KafkaHealthcheck.scala:61)
表示解析不了server38這個host！
使用hostname可以看到，我們機器的hostname就是server38
修改/etc/hosts文件，增加一行如下內容即可：
127.0.0.1 server38 localhost
kafka quick start