如何解决将pyspark与Neo4j连接
我想使用pyspark将数据提供给neo4j。我已经尝试了以下代码。
from pyspark.sql import SparkSession
spark = SparkSession.builder.master("local[1]") \
.appName("SparkByExamples.com") \
.getOrCreate()
df = spark.read.csv("countries.csv")
df.write \
.format("org.neo4j.spark.DataSource") \
.mode("ErrorIfExists") \
.option("url","bolt://localhost:7687") \
.option("labels",":Countries") \
.save()
但是它给了我这样的错误:
2020-11-11 17:49:19 WARN Utils:66 - Set SPARK_LOCAL_IP if you need to bind to another address
2020-11-11 17:49:20 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR,use setLogLevel(newLevel).
Traceback (most recent call last):
File "xxx",line 13,in <module>
.option("labels",":Countries") \
File "/opt/spark/spark-2.4.0-bin-hadoop2.7/python/pyspark/sql/readwriter.py",line 734,in save
self._jwrite.save()
File "/opt/spark/spark-2.4.0-bin-hadoop2.7/python/lib/py4j-0.10.7-src.zip/py4j/java_gateway.py",line 1257,in __call__
File "/opt/spark/spark-2.4.0-bin-hadoop2.7/python/pyspark/sql/utils.py",line 63,in deco
return f(*a,**kw)
File "/opt/spark/spark-2.4.0-bin-hadoop2.7/python/lib/py4j-0.10.7-src.zip/py4j/protocol.py",line 328,in get_return_value
py4j.protocol.Py4JJavaError: An error occurred while calling o40.save.
: java.lang.ClassNotFoundException: Failed to find data source: org.neo4j.spark.DataSource. Please find packages at http://spark.apache.org/third-party-projects.html
at org.apache.spark.sql.execution.datasources.DataSource$.lookupDataSource(DataSource.scala:657)
有人可以帮助我克服这个问题吗? 预先谢谢你。
解决方法
问题来自您的格式。您需要将该软件包包含在Spark Application中
尝试
def button_collide_mouse(element_x,element_y,x_to_remove,y_to_remove):
mouse_x,mouse_y = pygame.mouse.get_pos()
if mouse_x > element_x > mouse_x - x_to_remove and \
mouse_y > element_y > mouse_y - y_to_remove:
return True
def check_events(coin,settings):
for event in pygame.event.get():
# Change button color if mouse is touching it
if button_collide_mouse(coin.image_x,coin.image_y,125,125):
coin.image = pygame.image.load('pyfiles/images/click_button.png')
if event.type == pygame.MOUSEBUTTONUP:
settings.money += settings.income
else:
coin.image = pygame.image.load('pyfiles/images/click_button_grey.png')
,
您必须添加 neo4j-connector jar 并在启动 spark shell 时传递它。
pyspark --jars neo4j-connector-apache-spark_2.12-4.0.1_for_spark_3.jar
您可以从 https://neo4j.com/product/connectors/apache-spark-connector/
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