如何解决在Windows 10上,如何在不带Databricks但带wasbs的情况下从带有Apache Spark的Azure Blob中读取文件?
我有azure-storage-8.6.0.jar和hadoop-azure-3.0.1.jar。我不断从其他论坛上看到,我必须像https://github.com/hning86/articles/blob/master/hadoopAndWasb.md一样修改hadoop的etc文件夹中的core-site.xml文件。我什至不知道我什至需要下载所有hadoop才能运行Spark。我以为我需要的只是hadoop / bin中的winutils.exe。
spark.read.load(f"wasbs://{container_name}@{storage_account_name}.blob.core.windows.net/{container_name}/myfile.txt" )
Py4JJavaError: An error occurred while calling o53.load.
: java.io.IOException: No FileSystem for scheme: wasbs
at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2660)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2667)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:94)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2703)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2685)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
at org.apache.spark.sql.execution.streaming.FileStreamSink$.hasMetadata(FileStreamSink.scala:46)
at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:366)
at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:297)
at org.apache.spark.sql.DataFrameReader.$anonfun$load$2(DataFrameReader.scala:286)
at scala.Option.getOrElse(Option.scala:189)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:286)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:232)
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 py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:282)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.lang.Thread.run(Thread.java:748)
解决方法
如果要使用pyspark从Windows 10上的Azure blob存储中读取CSV文件,请参考以下步骤
- 安装pyspark
pip install pyspark
- 代码(创建.py文件)
from pyspark.sql import SparkSession
import traceback
try:
spark = SparkSession.builder.getOrCreate()
conf = spark.sparkContext._jsc.hadoopConfiguration()
conf.set("fs.wasbs.impl","org.apache.hadoop.fs.azure.NativeAzureFileSystem")
spark.conf.set('fs.azure.account.key.<account name>.blob.core.windows.net','<account key>')
df = spark.read.option("header",True).csv(
'wasbs://<container name>@<account name>.blob.core.windows.net/<directory name>/<file name>')
df.show()
except Exception as exp:
print("Exception occurred")
print(traceback.format_exc())
- 运行代码
cd <your python or env path>\Scripts
spark-submit --packages org.apache.hadoop:hadoop-azure:3.2.1,com.microsoft.azure:azure-storage:8.6.5 <your py file path>
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