Kafka_ 2.12-2.5.1 cluster building and parameter tuning

public 2020-11-08 19:30:15
kafka_ kafka 2.12-2.5.1 2.5.1 cluster

Kafka It is the most widely used message queue in the industry . Data flow is a common business scenario , The client pushes the collected logs to Kafka, The business side can consume Kafka Data landing HDFS, For offline analysis , You can also use Spark or Flink consumption Kafka Data in , For real-time calculation .Kafka It plays a role as a link in the process of data flow , It can be used for decoupling between log collection and data processing systems .

This article will introduce how to build Kafka Detailed installation steps of cluster , And according to the problems encountered in daily business , Yes Linux Systems and Kafka The configuration parameters of the node are optimized .

1. Environmental statement

Components edition explain
Kafka 2.12-2.5.1
Zookeeper 3.5.8 5 Nodes
JDK 1.8.0_144

Server configuration :

CPU:【2*Intel(R) Xeon(R) Silver 4214 Processor 12 Cores 24 Threads 2.20 GHz】
Memory :【8*16G DDR4-2666 ECC 1.2v RDIMM】
Mechanical drive :【12*4T 7200 turn 3.5 " SATA Interface 】
network card : Wan Zhao nic
Linux System :centos7.6

2. Initialize the basic environment of each node

  • install jdk1.8
 download jdk1.8.0_144, And unpack it /usr/local Catalog
  • close swap

If you don't close swap, Memory is frequently swapped with disk space , There will be an increase in gc The risk of time .

# Provisional entry into force
swapoff -a
# permanent
echo 'swapoff -a' >> /etc/rc.d/rc.local
  • Modify the maximum number of open files

Linux The maximum number of files opened by default is 1024, if Kafka There are a lot of writing and consumer side , It's easy to exceed the default value , Lead to broker Abnormal shutdown .

# Provisional entry into force
ulimit -n 102400
# see open files Number
ulimit -a | grep 'open files'
# permanent
vim /etc/security/limits.conf
* soft nofile 102400
* hard nofile 102400

3. build zk colony

build 5 Of nodes zk colony , You can guarantee to hang up to two zk In the case of nodes ,zk The cluster can still provide external services normally .
zk Please refer to the last blog for the steps of cluster building :zookeeper-3.5.8 Cluster building

4. The transfer plane is equipped with a copy of Kafka

Download decompression

 Download one from the official website kafka_2.12-2.5.1 Program compression package , Unzip to the current directory .

Modify the configuration

  • modify bin/kafka-server-start.sh file

Configure log print Directory 、 to open up JMX port 、 Rely on the JDK, as well as JVM Memory .

vim bin/kafka-server-start.sh
export LOG_DIR="/var/log/kafka"
export JMX_PORT="2020"
export JAVA_HOME="/usr/local/jdk1.8.0_144"
if [ "x$KAFKA_HE:AP_OPTS" = "x" ]; then
export KAFKA_HEAP_OPTS="-Xmx6G -Xms6G"
  • modify bin/kafka-run-class.sh

To configure JVM The garbage collector G1 Parameters .

vim bin/kafka-run-class.sh
export JAVA_HOME="/usr/local/jdk1.8.0_144" # Other scripts call the shell, need JDK Environmental Science
KAFKA_JVM_PERFORMANCE_OPTS="-server -XX:MetaspaceSize=96m -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M -XX:MinMetaspaceFreeRatio=50 -XX:MaxMetaspaceFreeRatio=80"
  • modify config/server.properties file
vim config/server.properties
# In the amount of writing 150MB/s, Read volume 300MB/s Under the circumstances , Use the following two configurations , Network threads and disks IO The average thread idle rate is about 30%.
log.dirs=/data*/kafka-logs # Depending on the circumstances
zookeeper.connect=zk1.bjehp.com:2181,zk2.bjehp.com:2181,zk3.bjehp.com:2181,zk4.bjehp.com:2181,zk5.bjehp.com:2181/kafka/talos # Pay attention to revision zookeeper Address
# The following notes are Kafka Default parameters , Be careful zk The connection time and timeout time of are determined by 0.8 Version of 6s Upgrade to the current version of 18s.

5. Install and start at each node Kafka


  • Synchronous installation package
 It's going to turn around Kafka Copy the installation package to local /usr/local/ Catalog
  • Modify according to the actual situation of the machine server.properties The configuration file
vim /usr/local/kafka_2.12-2.5.1/config/server.properties
broker.id=10* # modify broker id Parameters
log.dirs=/data*/kafka-logs # Modify... According to the actual situation log Catalog
listeners=SASL_PLAINTEXT://hostname:9090 # modify hostname

Start and verify

nohup /usr/local/kafka_2.12-2.5.1/bin/kafka-server-start.sh /usr/local/kafka_2.12-2.5.1/config/server.properties > /dev/null 2>&1 &
ps aux | grep kafka
tailf /var/log/kafka/server.log
netstat -tnlp | grep 9090
netstat -tnlp | grep 2020

stop it


6. Service operation and maintenance

Clear the log regularly

vim /etc/cron.d/kafka-logclean
# Clear it regularly every day 1 The day before kafka Log files
5 4 * * * root find /var/log/kafka/*.log.* -type f -mtime +1 | xargs rm -f

Configure monitoring alarm

  • Configure the disk of the server 、 Memory 、cpu load Call the police
  • To configure Kakfa Node port alarm


This paper introduces Kakfa The detailed steps of cluster building , as well as Linux Systems and Kafka Node parameter tuning . In recent years, with Kafka Version iteration , The old version of bug( such as 0.8 edition ) And it's constantly being repaired , And new features are emerging , For example, traffic quota 、exactly-once Semantics, etc , bring Kafka Clusters are becoming more and more stable , This will significantly reduce cluster failures .Kafka There are many ingenious designs in the implementation of many function points , It is worth learning and exploring ~~~


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