使用PySpark和Kafka,Py4jJavaError的结构化流：调用O70时出错。AwaitTermination

Question

我试图使用Spark，更具体地说是PySpark和结构化流来消费Kafka。

import os
import time
import time

from ast import literal_eval
from pyspark.sql.types import *
from pyspark.sql.functions import from_json, col, struct, explode
from pyspark.sql import SparkSession
os.environ['PYSPARK_SUBMIT_ARGS'] = '--packages org.apache.spark:spark-sql-kafka-0-10_2.11:2.3.0 pyspark-shell'

spark = SparkSession \
    .builder \
    .appName("Structured Streaming") \
    .getOrCreate()

    requests = spark \
  .readStream \
  .format("kafka") \
  .option("kafka.bootstrap.servers", "ip-ec2:9092") \
  .option("subscribe", "ssp.requests") \
  .option("startingOffsets", "earliest") \
  .load()

requests.printSchema()

# root  |-- key: binary (nullable = true)  |-- value: binary (nullable =
# true)  |-- topic: string (nullable = true)  |-- partition: integer
# (nullable = true)  |-- offset: long (nullable = true)  |-- timestamp:
# timestamp (nullable = true)  |-- timestampType: integer (nullable =
# true)

rawQuery = requests \
        .selectExpr("topic", "CAST(key AS STRING)", "CAST(value AS STRING)") \
        .writeStream.trigger(processingTime="5 seconds") \
        .format("parquet") \
        .option("checkpointLocation", "/home/user/folder/applicationHistory") \
        .option("path", "/home/user/folder") \
        .start()
rawQuery.awaitTermination()    

PY4JJavaError：调用O70时出错。AwaitTermination

Answer 1

我只是将行rawquery.awaittermination（）替换为

print(rawQuery.status)
time.sleep(60)
print(rawQuery.status)
rawQuery.stop()

而且管用。