Question

我正在使用PyCharm和PySpark运行一个巨大的文本文件。

这就是我想要做的事情：

spark_home = os.environ.get('SPARK_HOME', None)
os.environ["SPARK_HOME"] = "C:\spark-2.3.0-bin-hadoop2.7"
import pyspark
from pyspark import SparkContext, SparkConf
from pyspark.sql import SparkSession
conf = SparkConf()
sc = SparkContext(conf=conf)
spark = SparkSession.builder.config(conf=conf).getOrCreate() 
import pandas as pd
ip = spark.read.format("csv").option("inferSchema","true").option("header","true").load(r"some other file.csv")
kw = pd.read_csv(r"some file.csv",encoding='ISO-8859-1',index_col=False,error_bad_lines=False)
for i in range(len(kw)):
    rx = '(?i)'+kw.Keywords[i]
    ip = ip.where(~ip['Content'].rlike(rx))
op = ip.toPandas()
op.to_csv(r'something.csv',encoding='utf-8')

但是，PyCharm给我这个错误：

To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
2018-06-08 11:31:52 WARN  Utils:66 - Truncated the string representation of a plan since it was too large. This behavior can be adjusted by setting 'spark.debug.maxToStringFields' in SparkEnv.conf.
Traceback (most recent call last):
  File "C:/Users/mainak.paul/PycharmProjects/Concept_Building_SIP/ThemeSparkUncoveredGames.py", line 17, in <module>
    op = ip.toPandas()
  File "C:\Python27\lib\site-packages\pyspark\sql\dataframe.py", line 1966, in toPandas
    pdf = pd.DataFrame.from_records(self.collect(), columns=self.columns)
  File "C:\Python27\lib\site-packages\pyspark\sql\dataframe.py", line 466, in collect
    port = self._jdf.collectToPython()
  File "C:\Python27\lib\site-packages\py4j\java_gateway.py", line 1160, in __call__
    answer, self.gateway_client, self.target_id, self.name)
  File "C:\Python27\lib\site-packages\pyspark\sql\utils.py", line 63, in deco
    return f(*a, **kw)
  File "C:\Python27\lib\site-packages\py4j\protocol.py", line 320, in get_return_value
    format(target_id, ".", name), value)
py4j.protocol.Py4JJavaError: An error occurred while calling o30.collectToPython.
: java.lang.IllegalArgumentException

我只是没理解为什么.toPandas()无效。 Spark版本是2.3。这个版本有什么变化我不知道吗？我在不同的机器上使用spark 2.2运行此代码，运行正常。

我甚至将导出行改为这样的

op = ip.where(ip['Content'].rlike(rx)).toPandas()

仍然得到同样的错误。我究竟做错了什么？是否有其他方法可以在不影响性能的情况下将pyspark.sql.dataframe.DataFrame导出到.csv？

EDITED 我也尝试过使用：

ip.write.csv('file.csv')

现在我收到以下错误：

Traceback (most recent call last):
  File "somefile.csv", line 21, in <module>
    ip.write.csv('somefile.csv')
  File "C:\Python27\lib\site-packages\pyspark\sql\readwriter.py", line 883, in csv
    self._jwrite.csv(path)
  File "C:\Python27\lib\site-packages\py4j\java_gateway.py", line 1160, in __call__
    answer, self.gateway_client, self.target_id, self.name)
  File "C:\Python27\lib\site-packages\pyspark\sql\utils.py", line 63, in deco
    return f(*a, **kw)
  File "C:\Python27\lib\site-packages\py4j\protocol.py", line 320, in get_return_value
    format(target_id, ".", name), value)
py4j.protocol.Py4JJavaError: An error occurred while calling o102.csv.

添加stacktrace：

Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
18/06/11 16:53:14 ERROR Shell: Failed to locate the winutils binary in the hadoop binary path
java.io.IOException: Could not locate executable C:\spark-2.3.0-bin-hadoop2.7\bin\bin\winutils.exe in the Hadoop binaries.
    at org.apache.hadoop.util.Shell.getQualifiedBinPath(Shell.java:379)
    at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:394)
    at org.apache.hadoop.util.Shell.<clinit>(Shell.java:387)
    at org.apache.hadoop.util.StringUtils.<clinit>(StringUtils.java:80)
    at org.apache.hadoop.security.SecurityUtil.getAuthenticationMethod(SecurityUtil.java:611)
    at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:273)
    at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:261)
    at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:791)
    at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:761)
    at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:634)
    at org.apache.spark.util.Utils$$anonfun$getCurrentUserName$1.apply(Utils.scala:2430)
    at org.apache.spark.util.Utils$$anonfun$getCurrentUserName$1.apply(Utils.scala:2430)
    at scala.Option.getOrElse(Option.scala:121)
    at org.apache.spark.util.Utils$.getCurrentUserName(Utils.scala:2430)
    at org.apache.spark.SparkContext.<init>(SparkContext.scala:295)
    at org.apache.spark.api.java.JavaSparkContext.<init>(JavaSparkContext.scala:58)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
    at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:247)
    at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
    at py4j.Gateway.invoke(Gateway.java:236)
    at py4j.commands.ConstructorCommand.invokeConstructor(ConstructorCommand.java:80)
    at py4j.commands.ConstructorCommand.execute(ConstructorCommand.java:69)
    at py4j.GatewayConnection.run(GatewayConnection.java:214)
    at java.base/java.lang.Thread.run(Thread.java:844)
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.hadoop.security.authentication.util.KerberosUtil (file:/C:/opt/spark/spark-2.2.0-bin-hadoop2.7/jars/hadoop-auth-2.7.3.jar) to method sun.security.krb5.Config.getInstance()
WARNING: Please consider reporting this to the maintainers of org.apache.hadoop.security.authentication.util.KerberosUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
18/06/11 16:53:14 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Traceback (most recent call last):
  File "C:/Users/mainak.paul/PycharmProjects/Concept_Building_SIP/ThemeSparkUncoveredGames.py", line 22, in <module>
    op = ip.toPandas().collect()
  File "C:\Python27\lib\site-packages\pyspark\sql\dataframe.py", line 1937, in toPandas
    if self.sql_ctx.getConf("spark.sql.execution.pandas.respectSessionTimeZone").lower() \
  File "C:\Python27\lib\site-packages\pyspark\sql\context.py", line 142, in getConf
    return self.sparkSession.conf.get(key, defaultValue)
  File "C:\Python27\lib\site-packages\pyspark\sql\conf.py", line 46, in get
    return self._jconf.get(key)
  File "C:\Python27\lib\site-packages\py4j\java_gateway.py", line 1160, in __call__
    answer, self.gateway_client, self.target_id, self.name)
  File "C:\Python27\lib\site-packages\pyspark\sql\utils.py", line 63, in deco
    return f(*a, **kw)
  File "C:\Python27\lib\site-packages\py4j\protocol.py", line 320, in get_return_value
    format(target_id, ".", name), value)
py4j.protocol.Py4JJavaError: An error occurred while calling o86.get.
: java.util.NoSuchElementException: spark.sql.execution.pandas.respectSessionTimeZone
    at org.apache.spark.sql.internal.SQLConf$$anonfun$getConfString$2.apply(SQLConf.scala:1089)
    at org.apache.spark.sql.internal.SQLConf$$anonfun$getConfString$2.apply(SQLConf.scala:1089)
    at scala.Option.getOrElse(Option.scala:121)
    at org.apache.spark.sql.internal.SQLConf.getConfString(SQLConf.scala:1089)
    at org.apache.spark.sql.RuntimeConfig.get(RuntimeConfig.scala:74)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
    at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
    at py4j.Gateway.invoke(Gateway.java:280)
    at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
    at py4j.commands.CallCommand.execute(CallCommand.java:79)
    at py4j.GatewayConnection.run(GatewayConnection.java:214)
    at java.base/java.lang.Thread.run(Thread.java:844)


Process finished with exit code 1

Answer 1

您需要按如下方式更改代码：

spark_home = os.environ.get('SPARK_HOME', None)
os.environ["SPARK_HOME"] = "C:\spark-2.3.0-bin-hadoop2.7"
import pyspark
from pyspark import SparkContext, SparkConf
from pyspark.sql import SparkSession
conf = SparkConf()
sc = SparkContext(conf=conf)
spark = SparkSession.builder.config(conf=conf).getOrCreate() 
import pandas as pd
ip = spark.read.format("csv").option("inferSchema","true").option("header","true").load(r"some other file.csv")
kw = pd.read_csv(r"some file.csv",encoding='ISO-8859-1',index_col=False,error_bad_lines=False)
for i in range(len(kw)):
    rx = '(?i)'+kw.Keywords[i]
    ip = ip.where(~ip['Content'].rlike(rx))
op = ip.toPandas().collect()
op.to_csv(r'something.csv',encoding='utf-8')

toPandas()需要在PySpark中执行collect()操作才能实现DataFrame。但是不应该对大型数据集执行此操作，因为toPandas().collect()会导致数据移动到驱动程序，如果数据集要大到适合驱动程序内存，则可能会崩溃。

关于这一行：ip.write.csv('file.csv')我相信它应该更改为ip.write.csv('file:///home/your-user-name/file.csv')以将文件保存在本地linux文件系统上，

ip.option("header", "true").csv("file:///C:/out.csv")将文件保存在本地Windows文件系统上（如果您在Windows上运行Spark和Hadoop）

或 ip.write.csv('hdfs:///user/your-user/file.csv')将文件保存到HDFS

请告诉我这个解决方案是否适合您。

<强>更新

https://github.com/steveloughran/winutils/tree/master/hadoop-2.7.1/bin点击此链接并下载winutils.exe文件。在C驱动器上创建名为 hadoop 的文件夹，在 hadoop 文件夹中创建名为 bin 的文件夹。将之前下载的 winutils.exe 放入此目录。然后，您需要编辑系统变量并将变量 HADOOP_HOME 添加到列表中。一旦完成，你就不会从spark中获得winutils / hadoop的错误。

。只需输入＆＃34;编辑系统环境变量＆＃34;在你的Windows搜索

DF.topandas（）在pyspark中抛出错误

1 个答案: