我正在尝试使用结构化流从Kafka代理读取一些数据,以将其显示在Zeppelin笔记中。我使用的是在Heroku上托管的具有启用SSL的Spark 2.4.3,Scala 2.11,Python 2.7,Java 9和Kafka 2.2,但是却收到StreamingQueryException:“无法构造kafka使用者”。
我正在使用以下依赖项(在Spark解释器设置中设置):
org.apache.spark:spark-streaming-kafka-0-10_2.11:2.4.3
org.apache.spark:spark-streaming_2.11:2.4.3
org.apache.spark:spark-sql-kafka-0-10_2.11:2.4.3
我尝试了较新和较旧的版本,但这些应该与我使用的Spark / Scala版本匹配。
我已经使用简单的Python生产者和使用者成功地从Kafka进行了写作和阅读。
我正在使用的代码:
%pyspark
from pyspark.sql.functions import from_json
from pyspark.sql.types import *
from pyspark.sql.functions import col, expr, when
schema = StructType().add("power", IntegerType()).add("colorR", IntegerType()).add("colorG",IntegerType()).add("colorB",IntegerType()).add("colorW",IntegerType())
df = spark \
.readStream \
.format("kafka") \
.option("kafka.bootstrap.servers", brokers) \
.option("kafka.security.protocol", "SSL") \
.option("kafka.ssl.truststore.location", "/home/ubuntu/kafka/truststore.jks") \
.option("kafka.ssl.keystore.location", "/home/ubuntu/kafka/keystore.jks") \
.option("kafka.ssl.keystore.password", password) \
.option("kafka.ssl.truststore.password", password) \
.option("kafka.ssl.endpoint.identification.algorithm", "") \
.option("startingOffsets", "earliest") \
.option("subscribe", topic) \
.load()
schema = ArrayType(
StructType([StructField("power", IntegerType()),
StructField("colorR", IntegerType()),
StructField("colorG", IntegerType()),
StructField("colorB", IntegerType()),
StructField("colorW", IntegerType())]))
readDF = df.select( \
col("key").cast("string"),
from_json(col("value").cast("string"), schema))
query = readDF.writeStream.format("console").start()
query.awaitTermination()
我得到的错误:
Fail to execute line 43: query.awaitTermination()
Traceback (most recent call last):
File "/tmp/zeppelin_pyspark-2171412221151055324.py", line 380, in <module>
exec(code, _zcUserQueryNameSpace)
File "<stdin>", line 43, in <module>
File "/home/ubuntu/spark/python/lib/pyspark.zip/pyspark/sql/streaming.py", line 103, in awaitTermination
return self._jsq.awaitTermination()
File "/home/ubuntu/spark/python/lib/py4j-0.10.7-src.zip/py4j/java_gateway.py", line 1257, in __call__
answer, self.gateway_client, self.target_id, self.name)
File "/home/ubuntu/spark/python/lib/pyspark.zip/pyspark/sql/utils.py", line 75, in deco
raise StreamingQueryException(s.split(': ', 1)[1], stackTrace)
StreamingQueryException: u'Failed to construct kafka consumer\n=== Streaming Query ===\nIdentifier: [id = 2ee20c47-8293-469a-bc0b-ef71a1f118bc, runId = 72422290-090a-4b6d-bd66-088a5a534240]\nCurrent Committed Offsets: {}\nCurrent Available Offsets: {}\n\nCurrent State: ACTIVE\nThread State: RUNNABLE\n\nLogical Plan:\nProject [cast(key#7 as string) AS key#22, jsontostructs(ArrayType(StructType(StructField(power,IntegerType,true), StructField(colorR,IntegerType,true), StructField(colorG,IntegerType,true), StructField(colorB,IntegerType,true), StructField(colorW,IntegerType,true)),true), cast(value#8 as string), Some(Etc/UTC)) AS jsontostructs(CAST(value AS STRING))#21]\n+- StreamingExecutionRelation KafkaV2[Subscribe[tanana-44614.lightbulb]], [key#7, value#8, topic#9, partition#10, offset#11L, timestamp#12, timestampType#13]\n'
当我使用读写而不是readStream和writeStream时,我没有得到任何错误,但是当我向Kafka发送一些数据时,控制台上什么也没出现。
我还应该尝试什么?
答案 0 :(得分:0)
Kafka消费者似乎无法访问~/kafka/truststore.jks
,因此是例外。将~
替换为完全指定的路径(不使用波浪号),问题应该消失了。