Spark Streaming无法阅读Kafka主题 [英] Spark Streaming not reading from Kafka topics
问题描述
我已经在Ubuntu上设置了Kafka和Spark.我正在尝试使用pyspark(Jupyter笔记本)通过Spark Streaming阅读kafka主题. Spark既不读取数据也不抛出任何错误.
I have set up Kafka and Spark on Ubuntu. I am trying to read kafka topics through Spark Streaming using pyspark(Jupyter notebook). Spark is neither reading the data nor throwing any error.
Kafka生产者和消费者在终端上相互通信. Kafka在端口9092、9093、9094上配置了3个分区.消息已存储在kafka主题中.现在，我想通过Spark Streaming阅读它.我不确定我缺少什么.甚至我已经在Internet上进行了探索，但找不到任何可行的解决方案.请帮助我了解缺失的部分.
Kafka producer and consumer are communicating with each other on terminal. Kafka is configured with 3 partitions on port 9092,9093,9094. Messages are getting stored in kafka topics. Now, I want to read it through Spark Streaming. I am not sure what I am missing. Even I have explored it on internet, but couldnt find any working solution. Please help me to understand the missing part.
- 主题名称:new_topic
- 火花-2.3.2
- 卡夫卡-2.11-2.1.0
- Python 3
- Java- 1.8.0_201
- Zookeeper端口:2181
卡夫卡制片人: bin/kafka-console-producer.sh --broker-list localhost:9092 --topic new_topic
Kafka Producer : bin/kafka-console-producer.sh --broker-list localhost:9092 --topic new_topic
Kafka消费者: bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic new_topic --from-beginning
Kafka Consumer: bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic new_topic --from-beginning
Pyspark代码(Jupyter笔记本):
#!/usr/bin/env python
# coding: utf-8
import os
os.environ['PYSPARK_PYTHON'] = '/usr/bin/python3'
os.environ['PYSPARK_SUBMIT_ARGS'] = '--packages
org.apache.spark:spark-streaming-kafka-0-8_2.11:2.3.2 pyspark-shell'
import findspark
findspark.init('/home/shekhar/spark-2.3.2-bin-hadoop2.7')
import pyspark
import sys
from pyspark import SparkConf,SparkContext
from pyspark.streaming import StreamingContext
from pyspark.streaming.kafka import KafkaUtils
from uuid import uuid1
if __name__=="__main__":
#sconf = SparkConf().setAppName("SparkStr").setMaster("local")
sc = SparkContext(appName="SparkStreamingReceiverKafkaWordCount")
sc.setLogLevel("WARN")
ssc = StreamingContext(sc,2)
broker,topic = sys.argv[1:]
kvs = KafkaUtils.createStream(ssc,"localhost:9092","raw-event-
streaming-consumer",{topic:1})
lines = kvs.map(lambda x: x[1])
lines.pprint()
ssc.start()
ssc.awaitTermination()
Jypyter笔记本中显示的输出:
-------------------------------------------
Time: 2019-01-30 00:52:18
-------------------------------------------
-------------------------------------------
Time: 2019-01-30 00:52:20
-------------------------------------------
火花提交命令:
bin/spark-submit
--packages org.apache.spark:spark-streaming-kafka-0-8_2.11:2.3.2 SparkKafka-Copy1.py localhost:9092 new_topic
--master spark://localhost:4040
终端上的spark-submit输出如下:
Ivy Default Cache set to: /home/shekhar/.ivy2/cache
The jars for the packages stored in: /home/shekhar/.ivy2/jars
:: loading settings :: url = jar:file:/home/shekhar/spark-2.3.2-bin-hadoop2.7/jars/ivy-2.4.0.jar!/org/apache/ivy/core/settings/ivysettings.xml
org.apache.spark#spark-streaming-kafka-0-8_2.11 added as a dependency
:: resolving dependencies :: org.apache.spark#spark-submit-parent-0698f154-2d3f-4d56-b2c5-099190b947df;1.0
confs: [default]
found org.apache.spark#spark-streaming-kafka-0-8_2.11;2.3.2 in central
found org.apache.kafka#kafka_2.11;0.8.2.1 in central
found org.scala-lang.modules#scala-xml_2.11;1.0.2 in central
found com.yammer.metrics#metrics-core;2.2.0 in central
found org.slf4j#slf4j-api;1.7.16 in central
found org.scala-lang.modules#scala-parser-combinators_2.11;1.0.4 in central
found com.101tec#zkclient;0.3 in central
found log4j#log4j;1.2.17 in central
found org.apache.kafka#kafka-clients;0.8.2.1 in central
found net.jpountz.lz4#lz4;1.2.0 in central
found org.xerial.snappy#snappy-java;1.1.2.6 in central
found org.spark-project.spark#unused;1.0.0 in central
:: resolution report :: resolve 617ms :: artifacts dl 19ms
:: modules in use:
com.101tec#zkclient;0.3 from central in [default]
com.yammer.metrics#metrics-core;2.2.0 from central in [default]
log4j#log4j;1.2.17 from central in [default]
net.jpountz.lz4#lz4;1.2.0 from central in [default]
org.apache.kafka#kafka-clients;0.8.2.1 from central in [default]
org.apache.kafka#kafka_2.11;0.8.2.1 from central in [default]
org.apache.spark#spark-streaming-kafka-0-8_2.11;2.3.2 from central in [default]
org.scala-lang.modules#scala-parser-combinators_2.11;1.0.4 from central in [default]
org.scala-lang.modules#scala-xml_2.11;1.0.2 from central in [default]
org.slf4j#slf4j-api;1.7.16 from central in [default]
org.spark-project.spark#unused;1.0.0 from central in [default]
org.xerial.snappy#snappy-java;1.1.2.6 from central in [default]
---------------------------------------------------------------------
| | modules || artifacts |
| conf | number| search|dwnlded|evicted|| number|dwnlded|
---------------------------------------------------------------------
| default | 12 | 0 | 0 | 0 || 12 | 0 |
---------------------------------------------------------------------
:: retrieving :: org.apache.spark#spark-submit-parent-0698f154-2d3f-4d56-b2c5-099190b947df
confs: [default]
0 artifacts copied, 12 already retrieved (0kB/25ms)
2019-01-30 18:40:19 WARN Utils:66 - Your hostname, shekhar-VirtualBox resolves to a loopback address: 127.0.1.1; using 10.0.2.15 instead (on interface enp0s3)
2019-01-30 18:40:19 WARN Utils:66 - Set SPARK_LOCAL_IP if you need to bind to another address
2019-01-30 18:40:19 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Exception in thread "main" java.io.IOException: Cannot run program "python": error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
at org.apache.spark.deploy.PythonRunner$.main(PythonRunner.scala:100)
at org.apache.spark.deploy.PythonRunner.main(PythonRunner.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:894)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:198)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:228)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:137)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.forkAndExec(Native Method)
at java.lang.UNIXProcess.<init>(UNIXProcess.java:247)
at java.lang.ProcessImpl.start(ProcessImpl.java:134)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
... 12 more
2019-01-30 18:40:19 INFO ShutdownHookManager:54 - Shutdown hook called
2019-01-30 18:40:19 INFO ShutdownHookManager:54 - Deleting directory /tmp/spark-e6d0532c-3593-4c28-8bb6-6d48aedb12f3
推荐答案
现在已解决.我必须设置PYTHONPATH并将其导出到.bashrc文件的路径中.
It is resolved now. I had to set up the PYTHONPATH and export it in the path in .bashrc file.
PYTHONPATH=/usr/bin/python3
export PATH=$PATH:$PYTHONPATH/bin
在createstream下的主要功能中，zookeeper端口更改为2181，错误输入为9092.
Along with that in the main function under createstream, zookeeper port was changed to 2181, which was wrongly given as 9092.
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