Kafka-connect将Kafka数据同步到文件

一、背景信息

Kafka Connect主要用于将数据流输入和输出消息队列Kafka版。Kafka Connect主要通过各种Source Connector的实现，将数据从第三方系统输入到Kafka Broker，通过各种Sink Connector实现，将数据从Kafka Broker中导入到第三方系统。

官方文档：How to use Kafka Connect - Getting Started | Confluent Documentation

二、开发环境

中间件	版本
zookeeper	3.7.0
kafka	2.10-0.10.2.1

三、配置Kafka Connect

1、进到kafka的config文件夹下，修改connect-standalone.properties

# 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.

# These are defaults. This file just demonstrates how to override some settings.
bootstrap.servers=kafka-0:9092

# The converters specify the format of data in Kafka and how to translate it into Connect data. Every Connect user will
# need to configure these based on the format they want their data in when loaded from or stored into Kafka
key.converter=org.apache.kafka.connect.json.JsonConverter
value.converter=org.apache.kafka.connect.json.JsonConverter
# Converter-specific settings can be passed in by prefixing the Converter's setting with the converter we want to apply
# it to
key.converter.schemas.enable=false
value.converter.schemas.enable=false

# The internal converter used for offsets and config data is configurable and must be specified, but most users will
# always want to use the built-in default. Offset and config data is never visible outside of Kafka Connect in this format.
internal.key.converter=org.apache.kafka.connect.json.JsonConverter
internal.value.converter=org.apache.kafka.connect.json.JsonConverter
internal.key.converter.schemas.enable=false
internal.value.converter.schemas.enable=false

offset.storage.file.filename=/tmp/connect.offsets
# Flush much faster than normal, which is useful for testing/debugging
offset.flush.interval.ms=10000
# 核心配置
#plugin.path=/home/kafka/plugins

注意：Kafka Connect的早期版本不支持配置plugin.path，您需要在CLASSPATH中指定插件位置

vi /etc/profile
export CLASSPATH=/home/kafka/*
source /etc/profile

2、修改connect-file-sink.properties

# 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.

name=local-file-sink
connector.class=FileStreamSink
tasks.max=1
#文件路径
file=/home/kafka/disposefile/data_t1.txt
#文件数据输出到kafka的topic
topics=sink_t1

3、修改connect-file-source.properties

# 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.

name=local-file-source
connector.class=FileStreamSource
tasks.max=1
file=/home/kafka/disposefile/data_t1.txt
#kafka的topic数据输出到文件
topic=source_t1

四、启动命令

nohup bin/connect-standalone.sh config/connect-standalone.properties config/connect-file-source.properties config/connect-file-sink.properties > /home/kafka/connectlog/connect-file.log 2>&1 &