使用java操作zookeeper实现kafka-topics.sh的功能

红太狼 2022-04-05 15:22 433阅读 0赞

### 使用java操作zookeeper实现kafka-topics.sh的功能 ###

*  需求
 *  代码如下
 *  遇到的问题

# 需求 #

因为工作要求，需要对测试环境的kafka的所有topic增加分区。因为topic很多，所以手动使用命令行实现不太现实（写这篇文章的时候忽然想起来也可以实现。只需要写个脚本，加一个循环就可以了，好像还简单一点-\_-||）。所以寻求通过代码连接客户端的方式实现。

# 代码如下 #

import kafka.admin.AdminUtils;
    import kafka.admin.RackAwareMode;
    import kafka.utils.ZkUtils;
    import org.apache.kafka.common.security.JaasUtils;
    import org.junit.Test;
    import scala.collection.JavaConversions;
    import scala.collection.Map;
    import scala.collection.Seq;
    
    import java.util.List;
    import java.util.Properties;
    
    /** * Created by NightWatch on 2018/12/11. */
    public class TopicSh { 
    
        private static String hostAndPort = "10.1.24.216:2181";
    
        @Test
        //创建topic
        public void createTopic() { 
            ZkUtils zkUtils = ZkUtils.apply(hostAndPort, 30000, 30000, JaasUtils.isZkSecurityEnabled());
            AdminUtils.createTopic(zkUtils, "topic-name", 1, 1, new Properties(), RackAwareMode.Enforced$.MODULE$);
        }
    
        @Test
        //获取所有topic
        public void listTopicOne() { 
            ZkUtils zkUtils = ZkUtils.apply(hostAndPort, 30000, 30000, JaasUtils.isZkSecurityEnabled());
            Map<String, Properties> map = AdminUtils.fetchAllTopicConfigs(zkUtils);
            java.util.Map<String, Properties> javaMap = JavaConversions.asJavaMap(map);
            for (java.util.Map.Entry<String, Properties> entry : javaMap.entrySet()) { 
                //topic名称
                String topic = entry.getKey();
                System.out.println(topic);
                //TODO : 这个value我暂时也没搞懂是啥，等空闲了在研究吧
                Properties value = entry.getValue();
            }
        }
    
        @Test
        //获取所有topic，这种写法更简单一些
        public void listTopicTwo() { 
            ZkUtils zkUtils = ZkUtils.apply(hostAndPort, 30000, 30000, JaasUtils.isZkSecurityEnabled());
            Seq<String> allTopics = zkUtils.getAllTopics();
    
            List<String> topicsList = JavaConversions.seqAsJavaList(allTopics);
    
            //TODO: 这个写法我也没搞懂，同上
            topicsList.forEach(System.out::println);
        }
    
    
        @Test
        //修改topic分区数
        public void alterTopicPartition() { 
            ZkUtils zkUtils = ZkUtils.apply(hostAndPort, 30000, 30000, JaasUtils.isZkSecurityEnabled());
    
            List<String> topics = JavaConversions.seqAsJavaList(zkUtils.getAllTopics());
            for (String topic : topics) { 
                AdminUtils.addPartitions(zkUtils, topic, 4, "", true, RackAwareMode.Enforced$.MODULE$);
            }
            zkUtils.close();
        }
    }

# 遇到的问题 #

运行之后发现报了如下错误：

org.I0Itec.zkclient.exception.ZkException: org.apache.zookeeper.KeeperException$NoAuthException: KeeperErrorCode = NoAuth for /brokers/ids
    
    	at org.I0Itec.zkclient.exception.ZkException.create(ZkException.java:68)
    	at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:1000)
    	at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:676)
    	at org.I0Itec.zkclient.ZkClient.getChildren(ZkClient.java:672)
    	at kafka.utils.ZkUtils.getChildrenParentMayNotExist(ZkUtils.scala:568)
    	at kafka.utils.ZkUtils.getAllBrokersInCluster(ZkUtils.scala:161)
    	at kafka.admin.AdminUtils$.getBrokerMetadatas(AdminUtils.scala:380)
    	at kafka.admin.AdminUtils$.createTopic(AdminUtils.scala:402)
    	at kafka.admin.AdminUtils.createTopic(AdminUtils.scala)
    	at com.bicon.kafka.TopicSh.createTopic(TopicSh.java:26)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:498)
    	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
    	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
    	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
    	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:498)
    	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
    Caused by: org.apache.zookeeper.KeeperException$NoAuthException: KeeperErrorCode = NoAuth for /brokers/ids
    	at org.apache.zookeeper.KeeperException.create(KeeperException.java:113)
    	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
    	at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1472)
    	at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1500)
    	at org.I0Itec.zkclient.ZkConnection.getChildren(ZkConnection.java:119)
    	at org.I0Itec.zkclient.ZkClient$4.call(ZkClient.java:679)
    	at org.I0Itec.zkclient.ZkClient$4.call(ZkClient.java:676)
    	at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:990)
    	... 35 more

错误显示没有认证，一开始我推测可能是文件权限的问题  
于是我看了一下zookeeper的datadir目录

[root@localhost zookeeper]# ll
    总用量 4
    drwxr-xr-x 2 root root 4096 12月  7 09:41 version-2

发现非root用户果然没有写的权限，但是我又觉得不会是这个问题，然后我尝试百度了一下，发现好像还真不是这个原因。  
原来zookeeper会设置acl，登录zookeeper命令行查看

[root@localhost kafka_2.11-0.11.0.1]# ./bin/zookeeper-shell.sh 28.2.5.89:2181
    Connecting to 28.2.5.89:2181
    Welcome to ZooKeeper!
    JLine support is disabled
    
    WATCHER::
    
    WatchedEvent state:SyncConnected type:None path:null
    ls /
    [cluster, controller, brokers, zookeeper, kafka-acl, kafka-acl-changes, admin, isr_change_notification, controller_epoch, kafka-manager, consumers, latest_producer_id_block, config]
    getAcl /brokers/ids
    'ip,'10.1.24.216
    : cdrwa

果然被谁设置了权限。。于是修改权限

setAcl /brokers/ids world:anyone:cdrwa
    cZxid = 0x5
    ctime = Wed Dec 06 20:17:05 CST 2017
    mZxid = 0x5
    mtime = Wed Dec 06 20:17:05 CST 2017
    pZxid = 0x1fd7
    cversion = 63
    dataVersion = 0
    aclVersion = 2
    ephemeralOwner = 0x0
    dataLength = 0
    numChildren = 1
    getAcl /brokers/ids
    'world,'anyone
    : cdrwa

在此运行程序，成功！

**注：因为我这里是测试环境，所以随便修改权限配置没啥问题，不过大家还是别学我**

最后贴上提醒了我的文章 [https://my.oschina.net/anxiaole/blog/1814143][https_my.oschina.net_anxiaole_blog_1814143]

[https_my.oschina.net_anxiaole_blog_1814143]: https://my.oschina.net/anxiaole/blog/1814143