Kafka-Connect Cassandra Sink 连接器不将数据推送到 Cassandra

Question

我已经创建了 Kafka Standalone.properties 文件来建立连接。该文件位于 home/kafka/config/connect-standalone.properties，如下所示：

bootstrap.servers=localhost:9092

key.converter=org.apache.kafka.connect.storage.StringConverter
value.converter=org.apache.kafka.connect.json.JsonConverter
key.converter.schemas.enable=false
value.converter.schemas.enable=false

offset.storage.file.filename=/tmp/connect.offsets
offset.flush.interval.ms=10000

plugin.path=/home/kafka-connect-cassandra-sink-1.4.0/kafka-connect-cassandra-sink-1.4.0.jar

############################# 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=18000


#listeners=PLAINTEXT://:9092
advertised.listeners=PLAINTEXT://localhost:9092

在第二步，我添加了 kafka-connect-cassandra-sink-1.4.0 文件。文件放在路径 home/kafka-connect-cassandra-sink-1.4.0 ，文件如下：

name=users-sink
connector.class=com.datastax.oss.kafka.sink.CassandraSinkConnector
tasks.max=10

loadBalancing.localDc=datacenter1
contactPoints=localhost
port=9042

username=...
password=...

topics=demo
topic.demo.demo.users.mapping=lastname=value.lastname, firstname=value.firstname, email=value.email

在我的 PC 上 Zookeeper 已经运行并且我还使用以下命令启动了 Kafka bin/kafka-server-start.sh config/connect-standalone.properties

现在为了将 kafka 连接到接收器连接器，我使用了以下命令 sudo kafka/config/connect-standalone.properties kafka-connect-cassandra-sink-1.4.0/conf/cassandra-sink-standalone.properties &> standalone-mode.log &

我的 standalone-mode.log 文件是空的（我假设这意味着没有错误，因为在之前的尝试中，我已经解决了这个日志文件中的错误）。

现在，为了通过 cassandra 中的 kafka 接收器连接器上传文本文件，我使用了以下命令 cat Desktop/users.txt | kafka/bin/kafka-console-producer.sh --broker-list localhost:9092 --topic demo --property "parse.key=true" --property "key.separator=:"; sleep 10;

终端再次没有错误。但现在的问题是，当我编写查询以查看 cassandra 数据库中的数据时，table 为空：

user.txt 文件如下：

Pruitt:{"lastname":"Pruitt", "firstname":"Allie", "email":"allie@example.com"}
Krause:{"lastname":"Krause", "firstname":"Duncan", "email":"duncan@example.com"}
Chase:{"lastname":"Chase", "firstname":"Juana", "email":"juana@example.com"}
Estrada:{"lastname":"Estrada", "firstname":"Edward", "email":"edward@example.com"}
Singleton:{"lastname":"Singleton", "firstname":"Marie", "email":"Marie@example.com"}
Poole:{"lastname":"Poole", "firstname":"Olivia", "email":"olivia@example.com"}
Marks:{"lastname":"Marks", "firstname":"Timothy", "email":"timothy@example.com"}
Suarez:{"lastname":"Suarez", "firstname":"Claud", "email":"claud@example.com"}
Sloan:{"lastname":"Sloan", "firstname":"Eloy", "email":"eloy@example.com"}
Rodriguez:{"lastname":"Rodriguez", "firstname":"Gale", "email":"gale@example.com"}
Bautista:{"lastname":"Bautista", "firstname":"Constance", "email":"Constance@example.com"}
Mcintyre:{"lastname":"Mcintyre", "firstname":"Donte", "email":"donte@example.com"}
Lang:{"lastname":"Lang", "firstname":"Willa", "email":"willa@example.com"}
Richmond:{"lastname":"Richmond", "firstname":"Dionne", "email":"dionne@example.com"}

Answer 1

在 cassandra-sink-standalone.properties 文件中，您需要指定身份验证提供程序，否则它将默认为 None，这意味着连接器不会对集群进行身份验证。

根据您发布的内容，您似乎使用的是普通身份验证提供程序，因此请设置以下内容：

auth.provider=PLAIN
auth.username=username
auth.password=S0mePa$$word

干杯！

Answer 2

started the Kafka with the following command bin/kafka-server-start.sh config/connect-standalone.properties

您不使用 Connect 属性启动代理，您需要使用 server.properties

此外，您是否通过创建官方快速入门中提到的主题和其他任务来验证 Kafka 实际上运行ning？

standalone-mode.log file is empty(I am assuming that means no error

不一定。您没有使用该命令捕获 stderr。例如 2>&1

now connecting kafka to sink connector I used the following command sudo kafka/config/connect-standalone.properties kafka-connect-cassandra-sink-1.4.0/conf/...

received the following error : command not found kafka/config/connect-standalone.properties...

属性文件不可执行。您需要运行 connect-standalone.sh 将这两个连接属性文件作为参数

Kafka-Connect Cassandra Sink 连接器不将数据推送到 Cassandra

Kafka-Connect Cassandra Sink Connector Not Pushing Data To Cassandra

cassandra

apache-kafka

datastax