Failed to find leader for topics; java.lang.NullPointerException NullPointerException at org.apache.kafka.common.utils.Utils.formatAddress

问题

When we are trying to stream the data from SSL enabled Kafka topic we are facing below error . Can you please help us on this issue .

19/11/07 13:26:54 INFO ConsumerFetcherManager: [ConsumerFetcherManager-1573151189884] Added fetcher for partitions ArrayBuffer()
19/11/07 13:26:54 WARN ConsumerFetcherManager$LeaderFinderThread: [spark-streaming-consumer_dvtcbddc101.corp.cox.com-1573151189725-d40a510f-leader-finder-thread], Failed to find leader for Set([inst_monitor_status_test,2], [inst_monitor_status_test,0], [inst_monitor_status_test,1])
java.lang.NullPointerException
        at org.apache.kafka.common.utils.Utils.formatAddress(Utils.java:408)
        at kafka.cluster.Broker.connectionString(Broker.scala:62)
        at kafka.client.ClientUtils$$anonfun$fetchTopicMetadata$5.apply(ClientUtils.scala:89)
        at kafka.client.ClientUtils$$anonfun$fetchTopicMetadata$5.apply(ClientUtils.scala:89)
        at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
        at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
        at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
        at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
        at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
        at scala.collection.AbstractTraversable.map(Traversable.scala:104)
        at kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:89)
        at kafka.consumer.ConsumerFetcherManager$LeaderFinderThread.doWork(ConsumerFetcherManager.scala:66)
        at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:60)

Pyspark code :

from __future__ import print_function

import sys

from pyspark import SparkContext
from pyspark.streaming import StreamingContext
from pyspark.streaming.kafka import KafkaUtils
from pyspark import SparkConf, SparkContext
from operator import add
import sys
from pyspark.streaming import StreamingContext
from pyspark.streaming.kafka import KafkaUtils
import json
from kafka import SimpleProducer, KafkaClient
from kafka import KafkaProducer


def handler(message):
    records = message.collect()
    for record in records:
        print(record)


if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("Usage: kafka_wordcount.py <zk> <topic>", file=sys.stderr)
        exit(-1)
    sc = SparkContext(appName="PythonStreamingKafkaWordCount")
    ssc = StreamingContext(sc, 10)

    zkQuorum, topic = sys.argv[1:]
    kvs = KafkaUtils.createStream(ssc, zkQuorum, "spark-streaming-consumer", {topic: 1})
    lines = kvs.map(lambda x: x[1])
    counts = lines.flatMap(lambda line: line.split(" ")).map(lambda word: (word, 1)).reduceByKey(lambda a, b: a+b)
    counts.pprint()
    kvs.foreachRDD(handler)

    ssc.start()
    ssc.awaitTermination()

Spark submit command :

Spark submit:

/usr/hdp/2.6.1.0-129/spark2/bin/spark-submit --packages org.apache.spark:spark-streaming-kafka-0-8_2.11:2.1.0,org.apache.spark:spark-sql-kafka-0-10_2.11:2.1.0,org.apache.spark:spark-sql-kafka-0-10_2.11:2.3.0 dsstream2.py host:2181 inst_monitor_status_test

回答1:

Thanks for your inputs . I have passed the SSL parameters in following method and working fine as expected.

from pyspark.sql import SparkSession
from pyspark.sql.functions import *
from pyspark.sql.types import *
from pyspark.streaming import StreamingContext
import time

#  Spark Streaming context :

spark = SparkSession.builder.appName('PythonStreamingDirectKafkaWordCount').getOrCreate()
sc = spark.sparkContext
ssc = StreamingContext(sc, 20)

#  Kafka Topic Details :

KAFKA_TOPIC_NAME_CONS = "topic_name"
KAFKA_OUTPUT_TOPIC_NAME_CONS = "topic_to_hdfs"
KAFKA_BOOTSTRAP_SERVERS_CONS = 'kafka_server:9093'

#  Creating  readstream DataFrame :

df = spark.readStream \
     .format("kafka") \
     .option("kafka.bootstrap.servers", KAFKA_BOOTSTRAP_SERVERS_CONS) \
     .option("subscribe", KAFKA_TOPIC_NAME_CONS) \
     .option("startingOffsets", "earliest") \
     .option("kafka.security.protocol","SASL_SSL")\
     .option("kafka.client.id" ,"Clinet_id")\
     .option("kafka.sasl.kerberos.service.name","kafka")\
     .option("kafka.ssl.truststore.location", "/home/path/kafka_trust.jks") \
     .option("kafka.ssl.truststore.password", "password_rd") \
     .option("kafka.sasl.kerberos.keytab","/home/path.keytab") \
     .option("kafka.sasl.kerberos.principal","path") \
     .load()

df1 = df.selectExpr( "CAST(value AS STRING)")

#  Creating  Writestream DataFrame :

df1.writeStream \
   .option("path","target_directory") \
   .format("csv") \
   .option("checkpointLocation","chkpint_directory") \
   .outputMode("append") \
   .start()

ssc.awaitTermination()

来源：https://stackoverflow.com/questions/58755063/failed-to-find-leader-for-topics-java-lang-nullpointerexception-nullpointerexce