| # 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.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 |
| |
| # 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 |
| num.network.threads=3 |
| |
| # The number of threads that the server uses for processing requests, which may include disk I/O |
| num.io.threads=8 |
| |
| # The send buffer (SO_SNDBUF) used by the socket server |
| socket.send.buffer.bytes=102400 |
| |
| # The receive buffer (SO_RCVBUF) used by the socket server |
| socket.receive.buffer.bytes=102400 |
| |
| # The maximum size of a request that the socket server will accept (protection against OOM) |
| socket.request.max.bytes=104857600 |
| |
| |
| ############################# Log Basics ############################# |
| |
| # A comma separated list of directories under which to store log files |
| log.dirs=/tmp/kafka-logs |
| |
| # 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. |
| num.partitions=1 |
| |
| # 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. |
| 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 |
| log.retention.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. |
| log.segment.bytes=1073741824 |
| |
| # The interval at which log segments are checked to see if they can be deleted according |
| # to the retention policies |
| log.retention.check.interval.ms=300000 |
| |
| ############################# 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. |
| zookeeper.connect=localhost:2181 |
| |
| # Timeout in ms for connecting to zookeeper |
| 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. |
| group.initial.rebalance.delay.ms=0 |