# Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # see kafka.server.KafkaConfig for additional details and defaults ############################# Server Basics ############################# # The id of the broker. This must be set to a unique integer for each broker. #broker的全局唯一编号，不能重复 broker.id=0 ############################# Socket Server Settings ############################# # 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 #用来监听链接的端口，producer或consumer将在此端口上建立连接 port=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 # Maps listener names to security protocols, the default is for them to be the same. See the config documentation for more details #listener.security.protocol.map=PLAINTEXT:PLAINTEXT,SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,SASL_SSL:SASL_SSL # The number of threads that the server uses for receiving requests from the network and sending responses to the network #处理网络请求的线程数量 num.network.threads=3 # The number of threads that the server uses for processing requests, which may include disk I/O #用来处理磁盘IO的线程数量 num.io.threads=8 # The send buffer (SO_SNDBUF) used by the socket server # 发送套接字的缓冲区大小 socket.send.buffer.bytes=102400 # The receive buffer (SO_RCVBUF) used by the socket server # 接收套接字的缓冲区大小 socket.receive.buffer.bytes=102400 # The maximum size of a request that the socket server will accept (protection against OOM) # 请求套接字的缓冲区大小 socket.request.max.bytes=104857600 ############################# Log Basics ############################# # A comma separated list of directories under which to store log files # kafka运行日志存放路径 log.dirs=/root/kafka_2.12-2.1.0/logs/kafka # The default number of log partitions per topic. More partitions allow greater # parallelism for consumption, but this will also result in more files across # the brokers. # topic在当前broker上的分片个数 num.partitions=2 # The number of threads per data directory to be used for log recovery at startup and flushing at shutdown. # This value is recommended to be increased for installations with data dirs located in RAID array. # 用来恢复和清理data下数据的线程数量 num.recovery.threads.per.data.dir=1 ############################# Internal Topic Settings ############################# # The replication factor for the group metadata internal topics "__consumer_offsets" and "__transaction_state" # For anything other than development testing, a value greater than 1 is recommended for to ensure availability such as 3. #offsets.topic.replication.factor=1 #transaction.state.log.replication.factor=1 #transaction.state.log.min.isr=1 ############################# Log Flush Policy ############################# # Messages are immediately written to the filesystem but by default we only fsync() to sync # the OS cache lazily. The following configurations control the flush of data to disk. # There are a few important trade-offs here: # 1. Durability: Unflushed data may be lost if you are not using replication. # 2. Latency: Very large flush intervals may lead to latency spikes when the flush does occur as there will be a lot of data to flush. # 3. Throughput: The flush is generally the most expensive operation, and a small flush interval may lead to excessive seeks. # The settings below allow one to configure the flush policy to flush data after a period of time or # every N messages (or both). This can be done globally and overridden on a per-topic basis. # The number of messages to accept before forcing a flush of data to disk #log.flush.interval.messages=10000 # The maximum amount of time a message can sit in a log before we force a flush #log.flush.interval.ms=1000 ############################# Log Retention Policy ############################# # The following configurations control the disposal of log segments. The policy can # be set to delete segments after a period of time, or after a given size has accumulated. # A segment will be deleted whenever *either* of these criteria are met. Deletion always happens # from the end of the log. # The minimum age of a log file to be eligible for deletion due to age # segment文件保留的最长时间，超时将会被删除 log.retention.hours=168 # 滚动生成新的segment文件的最长时间 log.roll.hours=168 # A size-based retention policy for logs. Segments are pruned from the log unless the remaining # segments drop below log.retention.bytes. Functions independently of log.retention.hours. #log.retention.bytes=1073741824 # The maximum size of a log segment file. When this size is reached a new log segment will be created. # 日志文件中每个segment的大小，默认为1G log.segment.bytes=1073741824 # The interval at which log segments are checked to see if they can be deleted according # to the retention policies # 周期性检查文件大小的时间 log.retention.check.interval.ms=300000 # 日志清理是否打开 log.cleaner.enable=true ############################# Zookeeper ############################# # Zookeeper connection string (see zookeeper docs for details). # This is a comma separated host:port pairs, each corresponding to a zk # server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002". # You can also append an optional chroot string to the urls to specify the # root directory for all kafka znodes. # broker需要使用zookeeper保存meta数据--192.168.142.145:2181,192.168.142.146:2181,192.168.142.147:2181 # zookeeper.connect=localhost:2181 zookeeper.connect=192.168.142.145:2181,192.168.142.146:2181,192.168.142.147:2181 # Timeout in ms for connecting to zookeeper # zookeeper连接超时时间 zookeeper.connection.timeout.ms=6000 ############################# Group Coordinator Settings ############################# # The following configuration specifies the time, in milliseconds, that the GroupCoordinator will delay the initial consumer rebalance. # The rebalance will be further delayed by the value of group.initial.rebalance.delay.ms as new members join the group, up to a maximum of max.poll.interval.ms. # The default value for this is 3 seconds. # We override this to 0 here as it makes for a better out-of-the-box experience for development and testing. # However, in production environments the default value of 3 seconds is more suitable as this will help to avoid unnecessary, and potentially expensive, rebalances during application startup. # partion buffer中，消息的条数达到阀值，将触发flush到磁盘 log.flush.interval.messages=10000 # 消息buffer的时间，达到阀值，将触发flush到磁盘 log.flush.interval.ms=3000 #删除topic需要server.properties中设置delete.topic.enable=true,否则只是标记删除 delete.topic.enable=true #此处的host.name为本机IP（重要），如果不改，则客户端抛出:Producer connection to localhost:9092 unsuccessful错误 host.name=192.168.142.145