重启后Kafka主题不再存在

本文介绍了重启后Kafka主题不再存在的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在本地 kafka 集群中创建了一个主题，有 3 个服务器/代理通过从我的 kafka 安装目录运行以下内容

bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 2 --partitions 2 --topic user-activity-tracking-pipeline

一切正常，因为我能够从我的主题生成和消费消息.重新启动机器后，我通过在终端中运行以下命令从 kafka 安装目录启动了捆绑的 zookeeper

bin/zookeeper-server-start.sh config/zookeeper.properties

通过在终端从 kafka 安装目录执行以下命令启动了属于集群的 3 个服务器

env JMX_PORT=10001 bin/kafka-server-start.sh config/server1.properties环境 JMX_PORT=10002 bin/kafka-server-start.sh config/server2.properties环境 JMX_PORT=10003 bin/kafka-server-start.sh config/server3.properties

现在，当我通过在 kafka 安装目录的终端中运行以下命令来列出可用主题时，

bin/kafka-topics.sh --zookeeper localhost:2181 --list

结果为空！

这里是相关的服务器 1 配置条目.服务器 2 和服务器 3 的值非常相似

broker.id=1听众=PLAINTEXT://:9093num.network.threads=3num.io.threads=8socket.send.buffer.bytes=102400socket.receive.buffer.bytes=102400socket.request.max.bytes=104857600log.dirs=/tmp/kafka-logs-broker-1num.partitions=2num.recovery.threads.per.data.dir=1log.retention.hours=168log.segment.bytes=1073741824log.retention.check.interval.ms=300000log.cleaner.enable=falsezookeeper.connect=本地主机:2181zookeeper.connection.timeout.ms=6000

我确实注意到重启后的日志文件，所以没有清理任何东西

/tmp/kafka-logs-broker-1/tmp/kafka-logs-broker-2/tmp/kafka-logs-broker-3

我想知道为什么我尝试列出之前创建的主题 user-activity-tracking-pipeline" 不再存在?

解决方案

kafka-topics.sh 实际上在底层使用 zookeeper 数据来回答查询.理由是单个经纪人通常无法获得足够的信息来完整地描述主题.

如果您在重启过程中丢失了(我怀疑您确实这样做了，因为您提到了新的 zookeeper 启动)zookeeper 数据，那么 kafka-topics 现在完全失明，无法看到以前的 kafka 数据.

检查发生了什么的最好方法是在查询时实际执行 kafka 正在执行的操作！启动你的zookeeper客户端(就像做./zkCli.sh一样简单，然后输入ls/brokers/topics.如果它是空的，你的ZK数据就会丢失.>

I created a topic in my local kafka cluster with 3 servers / brokersby running the following from my kafka installation directory

bin/kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 2 --partitions 2 --topic user-activity-tracking-pipeline

Everything worked fine as I was able to produce and consumer messages from my topic. After restarting my machine, I started bundled zookeeper from kafka installation directory by running the following in the terminal

bin/zookeeper-server-start.sh config/zookeeper.properties

Started 3 servers belonging to the cluster by executing the following in terminal from kafka installation directory

env JMX_PORT=10001 bin/kafka-server-start.sh config/server1.properties
env JMX_PORT=10002 bin/kafka-server-start.sh config/server2.properties
env JMX_PORT=10003 bin/kafka-server-start.sh config/server3.properties

Now, when I list available topics by running the following in terminal from kafka installation directory,

bin/kafka-topics.sh --zookeeper localhost:2181 --list

result is empty!

Here are the relevant server 1 configuration entries. The values for server 2 and server 3 are quite similar

broker.id=1
listeners=PLAINTEXT://:9093
num.network.threads=3
num.io.threads=8
socket.send.buffer.bytes=102400
socket.receive.buffer.bytes=102400
socket.request.max.bytes=104857600
log.dirs=/tmp/kafka-logs-broker-1
num.partitions=2
num.recovery.threads.per.data.dir=1
log.retention.hours=168
log.segment.bytes=1073741824
log.retention.check.interval.ms=300000
log.cleaner.enable=false
zookeeper.connect=localhost:2181
zookeeper.connection.timeout.ms=6000

I do notice log files under after restart so nothing was cleaned up

/tmp/kafka-logs-broker-1
/tmp/kafka-logs-broker-2
/tmp/kafka-logs-broker-3

I am wondering why the previously created topic "user-activity-tracking-pipeline" doesn't exist any more when I try to list it?

解决方案

kafka-topics.sh actually uses zookeeper data under the hood to answer the query. The rationale being that a single broker generally can't have enough information by itself to describe topics completely.

If you lost (which I suspect you did, since you mention a new zookeeper start) zookeeper data during your restart process, kafka-topics is now totally blind and can't see former kafka data.

The best way to check what's happening is to actually do what kafka is doing when you query it ! Launch your zookeeper client (it's as simple as doing ./zkCli.sh, and type ls /brokers/topics. If it's empty, your ZK data is lost.

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