在Apache Flume中使用Apache Avro模式验证的方法如下:
首先,确保已经安装了Apache Flume和Apache Avro库,并在Flume的配置文件中配置了Avro Source和Avro Sink。
创建一个Avro模式文件,定义数据的结构。例如,创建一个名为example.avsc
的文件,内容如下:
{
"type": "record",
"name": "example",
"fields": [
{"name": "id", "type": "int"},
{"name": "name", "type": "string"}
]
}
flume.conf
的配置文件,内容如下:# flume.conf
# 定义Avro Source
agent.sources = avro-source
agent.sources.avro-source.type = avro
agent.sources.avro-source.bind = localhost
agent.sources.avro-source.port = 41414
# 定义Avro Sink
agent.sinks = avro-sink
agent.sinks.avro-sink.type = avro
agent.sinks.avro-sink.hostname = localhost
agent.sinks.avro-sink.port = 41415
agent.sinks.avro-sink.channel = memory-channel
agent.sinks.avro-sink.channel.capacity = 100
# 定义内存通道
agent.channels = memory-channel
agent.channels.memory-channel.type = memory
agent.channels.memory-channel.capacity = 1000
agent.channels.memory-channel.transactionCapacity = 100
# 配置Avro模式验证
agent.sinks.avro-sink.serializer = avro_event
agent.sinks.avro-sink.serializer.schemaFile = example.avsc
agent.sinks.avro-sink.serializer.schemaType = avro
$ flume-ng agent --conf-file flume.conf --name agent
$ java -jar avro-tools-*.jar fromjson --schema example.avsc '{"id": 1, "name": "John"}' | java -jar avro-tools-*.jar tojson
这将把Avro数据发送到Flume代理的Avro Source,并经过Avro模式验证后发送到Avro Sink。
这是一个使用Apache Flume中的Apache Avro模式验证的简单示例。通过配置Avro Sink的Avro模式验证设置,Flume可以确保接收到的数据符合指定的Avro模式。
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