Kafka 的安裝及运行
Linux 网络服务器CentOS 为例子。 Kafka 安裝获得下载链接，免费下载后缓解压力。 $ wget https://mirror.bit.edu.cn/apache/kafka/2.5.0/kafka_2.12-2.5.0.tgz $ tar -zxvf kafka_2.12-2.5.0.tgz && cd kafka_2.12-2.5.0
实际参照官方网站 Kafka - Quickstart。 运行 KafkaKafka 依靠 ZooKeeper，因此必须先运作后面一种。Kafak 安装文件下内置了 ZooKeeper，可立即运作不必独立安裝。 $ bin/zookeeper-server-start.sh config/zookeeper.properties
运作 Zookeeper 时发觉设备上沒有 Java，出错信息内容以下： $ bin/zookeeper-server-start.sh config/zookeeper.properties /root/dev/kafka/bin/kafka-run-class.sh: line 315: exec: java: not found
因此必须先安裝 Java。 安裝 Java 全过程中假如 yum 报 https 不正确，提醒 404 repo 详细地址失效等， yum install java 时的出错信息内容 $ yum install java-1.6.0-openjdk Failed to set locale, defaulting to C Loaded plugins: fastestmirror base | 3.6 kB 00:00:00 epel | 4.7 kB 00:00:00 extras | 3.4 kB 00:00:00 https://repo.mongodb.org/yum/redhat/2.2/mongodb-org/4.2/x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found Trying other mirror. To address this issue please refer to the below knowledge base article https://access.redhat.com/articles/1320623 If above article doesn't help to resolve this issue please create a bug on https://bugs.centos.org/ One of the configured repositories failed (MongoDB Repository), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Disable the repository, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable mongodb-org-4.2 4. Configure the failing repository to be skipped, if it is unavailable. Note that yum will try to contact the repo. when it runs most commands, so will have to try and fail each time (and thus. yum will be be much slower). If it is a very temporary problem though, this is often a nice compromise: yum-config-manager --save --setopt=mongodb-org-4.2.skip_if_unavailable=true failure: repodata/repomd.xml from mongodb-org-4.2: [Errno 256] No more mirrors to try. https://repo.mongodb.org/yum/redhat/2.2/mongodb-org/4.2/x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
依据提醒，实行 查验 Java 的安裝： $ java -version
java version "1.6.0_38"
OpenJDK Runtime Environment (IcedTea6 1.13.10) (rhel-1.13.10.0.el7_2-x86_64)
OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)
另，假如必须卸载掉，实行 再度运作 $ bin/zookeeper-server-start.sh config/zookeeper.properties Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/zookeeper/server/quorum/QuorumPeerMain : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:643) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:277) at java.net.URLClassLoader.access$000(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:212) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:323) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:268) Could not find the main class: org.apache.zookeeper.server.quorum.QuorumPeerMain. Program will exit.
依据提醒最少应当为 52 的版本号，依据 Unsupported major.minor version 52.0 [duplicate]得知 52 相匹配的词义化版本号。 另外，可根据 再度查验安裝： $ java -version
openjdk version "1.8.0_71"
OpenJDK Runtime Environment (build 1.8.0_71-b15)
OpenJDK 64-Bit Server VM (build 25.71-b15, mixed mode)
运行 Kafka 服务项目$ bin/kafka-server-start.sh config/server.properties
建立 Topic$ bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic test
建立经营者建立经营者推送信息 $ bin/kafka-console-producer.sh --bootstrap-server localhost:9092 --topic test
建立顾客$ bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning
这时发信息的地区有增加数据信息时，顾客处会即时获得到。 mac 该设备改动 Kafka 配备$ vi /usr/local/etc/kafka/server.properties
将 # The address the socket server listens on. It will get the value returned from # java.net.InetAddress.getCanonicalHostName() if not configured. # FORMAT: # listeners = listener_name://host_name:port # EXAMPLE: # listeners = PLAINTEXT://your.host.name:9092 - listeners=PLAINTEXT://:9092 listeners=PLAINTEXT://localhost:9092 # Hostname and port the broker will advertise to producers and consumers. If not set, # it uses the value for "listeners" if configured. Otherwise, it will use the value # returned from java.net.InetAddress.getCanonicalHostName(). #advertised.listeners=PLAINTEXT://your.host.name:9092
运行 zookeeper$ brew services start zookeeper ==> Successfully started `zookeeper` (label: homebrew.mxcl.zookeeper)
注： 根据 brew 和 zookeeper 自身的指令运作时，终止服务项目也必须相匹配的指令，即， 运行 kafka$ brew services start kafka ==> Successfully started `kafka` (label: homebrew.mxcl.kafka)
上边是以服务项目方式长驻运行，假如临时性运行，可应用下边的指令： $ zkServer start $ kafka-server-start /usr/local/etc/kafka/server.properties
建立 Topic$ kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
假如发生以下不正确： Exception in thread "main" kafka.zookeeper.ZooKeeperClientTimeoutException: Timed out waiting for connection while in state: CONNECTING at kafka.zookeeper.ZooKeeperClient.$anonfun$waitUntilConnected$3(ZooKeeperClient.scala:262) at kafka.zookeeper.ZooKeeperClient.waitUntilConnected(ZooKeeperClient.scala:258) at kafka.zookeeper.ZooKeeperClient.<init>(ZooKeeperClient.scala:119) at kafka.zk.KafkaZkClient$.apply(KafkaZkClient.scala:1863) at kafka.admin.TopicCommand$ZookeeperTopicService$.apply(TopicCommand.scala:341) at kafka.admin.TopicCommand$.main(TopicCommand.scala:55) at kafka.admin.TopicCommand.main(TopicCommand.scala)
$ zkServer status 22:22:32 /usr/bin/java ZooKeeper JMX enabled by default Using config: /usr/local/etc/zookeeper/zoo.cfg Client port found: 2181. Client address: localhost. Error contacting service. It is probably not running.
如果是像上边那样，zookeeper 压根没运行取得成功。尽管 随后不要相信在网上列的那一系列很有可能缘故：
这时必须做的是先停用服务项目， $ brew services start zookeeper
# 或
$ zkServer stop
随后开启 $ cat /usr/local/etc/zookeeper/log4j.properties
log4j.rootCategory=WARN, zklog
log4j.appender.zklog = org.apache.log4j.RollingFileAppender
log4j.appender.zklog.File = /usr/local/var/log/zookeeper/zookeeper.log
log4j.appender.zklog.Append = true
log4j.appender.zklog.layout = org.apache.log4j.PatternLayout
log4j.appender.zklog.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} %c{1} [%p] %m%n
能够见到，日志文档在 新开窗口应用 $ tail -n 50 -f /usr/local/var/log/zookeeper/zookeeper.log 2020-05-13 09:58:43 QuorumPeerMain [WARN] Either no config or no quorum defined in config, running in standalone mode 2020-05-13 09:58:43 ContextHandler [WARN] o.e.j.s.ServletContextHandler@e45f292{/,null,UNAVAILABLE} contextPath ends with /* 2020-05-13 09:58:43 ContextHandler [WARN] Empty contextPath 2020-05-13 09:58:43 NIOServerCnxnFactory [ERROR] Thread Thread[main,5,main] died java.lang.NoSuchMethodError: java.nio.ByteBuffer.clear()Ljava/nio/ByteBuffer; at org.apache.jute.BinaryOutputArchive.stringToByteBuffer(BinaryOutputArchive.java:77) at org.apache.jute.BinaryOutputArchive.writeString(BinaryOutputArchive.java:107) at org.apache.zookeeper.data.Id.serialize(Id.java:50) at org.apache.jute.BinaryOutputArchive.writeRecord(BinaryOutputArchive.java:123) at org.apache.zookeeper.data.ACL.serialize(ACL.java:51) at org.apache.zookeeper.server.ReferenceCountedACLCache.serialize(ReferenceCountedACLCache.java:136) at org.apache.zookeeper.server.DataTree.serialize(DataTree.java:1218) at org.apache.zookeeper.server.util.SerializeUtils.serializeSnapshot(SerializeUtils.java:152) at org.apache.zookeeper.server.persistence.FileSnap.serialize(FileSnap.java:210) at org.apache.zookeeper.server.persistence.FileSnap.serialize(FileSnap.java:227) at org.apache.zookeeper.server.persistence.FileTxnSnapLog.save(FileTxnSnapLog.java:406) at org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:248) at org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:240) at org.apache.zookeeper.server.ZooKeeperServer.loadData(ZooKeeperServer.java:290) at org.apache.zookeeper.server.ZooKeeperServer.startdata(ZooKeeperServer.java:450) at org.apache.zookeeper.server.NIOServerCnxnFactory.startup(NIOServerCnxnFactory.java:764) at org.apache.zookeeper.server.ServerCnxnFactory.startup(ServerCnxnFactory.java:98) at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:144) at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:106) at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:64) at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:128) at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:82)
缘故就很明亮了， java 中出错找不着相匹配方式 。依据 Kafka with Zookeeper 3.5.7 Crash NoSuchMethodError: java.nio.ByteBuffer.flip() 这一相近难题下的回应，解决方案有两个：
看过下应用 brew 安裝后的版本号： $ java -version openjdk version "1.8.0_252" OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_252-b09) OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.252-b09, mixed mode) $ brew info zookeeper zookeeper: stable 3.5.7 (bottled), HEAD Centralized server for distributed coordination of services ...
由于是该设备，升級 java 会较为非常容易实际操作些，立即： $ brew cask install java ...
进行后查询 java 版本号，早已赶到了全新的 14.0： $ java -version
openjdk version "14.0.1" 2020-04-14
OpenJDK Runtime Environment (build 14.0.1 7)
OpenJDK 64-Bit Server VM (build 14.0.1 7, mixed mode, sharing)
再度运行 zookeeper， $ zkServer start /usr/bin/java ZooKeeper JMX enabled by default Using config: /usr/local/etc/zookeeper/zoo.cfg Starting zookeeper ... STARTED
另外查询日志輸出：
能够见到，依然出错，但不正确早已发生变化。来看前边的流程起功效了。再看来新的出错， 错误报告里重要信息内容是 看来是端口占用的难题，查询 zookeeper 配备并加上 $ vi /usr/local/etc/zookeeper/zoo.cfg
# The number of snapshots to retain in dataDir #autopurge.snapRetainCount=3 # Purge task interval in hours # Set to "0" to disable auto purge feature #autopurge.purgeInterval=1 admin.serverPort=8089
再度试着运行并查询日志：
不正确早已升级变成 $ brew services start zookeeper
# 或
$ zkServer stop
再度运行： $ zkServer start /usr/bin/java ZooKeeper JMX enabled by default Using config: /usr/local/etc/zookeeper/zoo.cfg Starting zookeeper ... STARTED
查询日志早已沒有异常了：
再根据 $ zkServer status 11:57:01 /usr/bin/java ZooKeeper JMX enabled by default Using config: /usr/local/etc/zookeeper/zoo.cfg Client port found: 2181. Client address: localhost. Mode: standalone
最终，能够取得成功建立 Topic 了: $ kafka-topics --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
Created topic test.
建立经营者建立经营者并转化成信息： $ kafka-console-producer --broker-list localhost:9092 --topic test > hello
之上指令实行后会进到互动cmd，每键入一行意味着一条信息。 建立顾客消費信息： $ kafka-console-consumer --bootstrap-server localhost:9092 --topic test --from-beginning > hello
运行之后从序列起止处逐渐消費信息并輸出。 有关資源
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