apacheflume从python脚本获取数据

ldxq2e6h  于 2021-06-04  发布在  Flume
关注(0)|答案(1)|浏览(417)

我正在运行一个python脚本来收集来自新闻提供者的数据,并在flume.conf文件中获取这个脚本。

我的flume.conf文件:

newsAgent.sources = r1
newsAgent.sinks = spark
newsAgent.channels = MemChannel

# Describe/configure the source

newsAgent.sources.r1.type = exec
newsAgent.sources.r1.command = python path_to/data_collector.py

# Describe the sink

newsAgent.sinks.spark.type = avro
newsAgent.sinks.spark.channel = memoryChannel
newsAgent.sinks.spark.hostname = localhost
newsAgent.sinks.spark.port = 4040

# Use a channel which buffers events in memory

newsAgent.channels.MemChannel.type = memory
newsAgent.channels.MemChannel.capacity = 10000
newsAgent.channels.MemChannel.transactionCapacity = 100

# Bind the source and sink to the channel

newsAgent.sources.r1.channels = MemChannel
newsAgent.sinks.spark.channel = MemChannel

python脚本在sunalation中运行良好,我可以看到json数据被打印出来。但当我通过flume执行时,数据会下沉,从而触发低于警告的消息。

警告信息

18/08/04 07:36:20 WARN HttpParser: Illegal character 0x0 in state=START 
for buffer HeapByteBuffer@5ae61d8b[p=1,l=8192,c=8192,r=8191]= . {\x00<<<\x00\x00\x01\x00\x00\x00\x06\x00\x00\x000\x86\xAa\xDa\xE2\xC4T...ing town", "sum>>>}
18/08/04 07:36:20 WARN HttpParser: bad HTTP parsed: 400 Illegal character 0x0 for HttpChannelOverHttp@46691f53{r=0,c=false,a=IDLE,uri=null}

数据采集器.py

def process():
    for k, v in news_source.items():
        feeds = feedparser.parse(v)
        for e in feeds.entries:
            doc = json.dumps(
                {"news_provider": k, "title": e.title.strip(), "summary": BeautifulSoup(e.summary, 'lxml').text.strip(),
                 "id": e.id.strip(), "published": e.published if e.has_key('published') else None})
            print("%s"%doc)

流媒体脚本

def func():
    sc = SparkContext(master="local[*]", appName="App")
    ssc  = StreamingContext(sc, 300)
    flume_strm = FlumeUtils.createStream(ssc, "localhost", 9999)

    lines = flume_strm.map(lambda v: json.loads(v[1]))
    lines.pprint()
    ssc.start()
    ssc.awaitTermination()

使用的命令

bin/flume-ng agent --conf conf --conf-file libexec/conf/test.conf --name Agent -Dflume.root.logger=INFO,console

spark-submit --packages org.apache.spark:spark-streaming-flume_2.11:2.2.0  path_to/streaming_script.py

我无法摆脱这些警告消息,我希望使用pprint()在spark日志中打印相同的json数据,稍后我可以相应地处理这些消息。
在读取流式内容时是否缺少任何特定配置?我需要指定任何特定的编码器吗?
谢谢你的帮助。

piwo6bdm

piwo6bdm1#

我一定和你看过同样的教程。我尝试了很多不同的选择。大多数没有成功。不过,我找到了一个解决方法:在flume.conf中使用exec源代码,并完全按照您所做的方式调用脚本。但是,在python脚本中,将数据写入一个文件。然后在脚本(data\u collector.py)停止执行之前“cat”文件。
我认为这是因为exec源代码需要“流式”数据,而仅仅打印输出将不起作用。
我的设置与你的非常相似:
stream.py(删除逻辑以便于理解):

from pyspark import SparkContext
from pyspark.streaming import StreamingContext
from pyspark.streaming.flume import FlumeUtils

if __name__ == "__main__":
    sc = SparkContext(appName="test");
    ssc = StreamingContext(sc, 30)
    stream = FlumeUtils.createStream(ssc, "127.0.0.1", 55555)
    stream.pprint()

这里是我的data_collector.py(注意最后一行的“cat”命令):


# ! /usr/bin/python

import requests
import random

class RandResp():
    def __init__(self):
        self.url = "https://swapi.co/api/people/"
        self.rand = str(random.randint(0, 17))
        self.r = requests.get(self.url + self.rand)

    def get_r(self):
        return(self.r.text)

if __name__ == "__main__":
    import os
    with open("exec.txt", "w") as file_in:
        file_in.write(RandResp().get_r())
    os.system("cat exec.txt")

这是我的flume.conf:


# list sources, sinks and channels in the agent

agent.sources = tail-file
agent.channels = c1
agent.sinks=avro-sink

# define the flow

agent.sources.tail-file.channels = c1
agent.sinks.avro-sink.channel = c1
agent.channels.c1.type = memory
agent.channels.c1.capacity = 1000

# define source and sink

agent.sources.tail-file.type = exec
agent.sources.tail-file.command =  python /home/james/Desktop/testing/data_collector.py
agent.sources.tail-file.channels = c1
agent.sinks.avro-sink.type = avro
agent.sinks.avro-sink.hostname = 127.0.0.1
agent.sinks.avro-sink.port = 55555

所以基本上在我的data_collector.py中,我只需执行任何需要执行的逻辑,将其写入一个名为exec.txt的文件,然后立即“cat”该文件。它工作。。。祝你好运

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