pyspark：找不到本地文件

Question

我有以下简单的 python 代码：

from __future__ import print_function

import sys
from operator import add

from pyspark import SparkContext


if __name__ == "__main__":
    print(len(sys.argv))
    if len(sys.argv) < 2:
        print("Usage: wordcount <file>", file=sys.stderr)
        exit(-1)
    sc = SparkContext(appName="PythonWordCount")
    lines = sc.textFile(sys.argv[2], 1)
    counts = lines.flatMap(lambda x: x.split(' ')).map(lambda x: (x, 1)).reduceByKey(add)
    output = counts.collect()
    for (word, count) in output:
        print("%s: %i" % (word, count))

    sc.stop()

然后我尝试在本地集群上运行它：

spark-submit --master spark://rws-lnx-sprk01:7077 /home/edamameQ/wordcount.py wordcount /home/edamameQ/wordTest.txt

wordTest.txt绝对可用：

edamameQ@spark-cluster:~$ ls
data    jars   myJob.txt  wordTest.txt  wordcount.py

但我不断收到错误消息：

Driver stacktrace:
    at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1283)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage.apply(DAGScheduler.scala:1271)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage.apply(DAGScheduler.scala:1270)
    at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
 :
 :
Caused by: java.io.FileNotFoundException: File file:/home/edamameQ/wordTest.txt does not exist
    at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:520)
    at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:398)
    at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.<init>(ChecksumFileSystem.java:137)
    at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:339)

相同的代码在 AWS 上使用来自 s3 位置的输入文件工作。我需要为本地集群上的运行ning 调整什么吗？谢谢！

Answer 1

您要阅读的文件必须可供所有工作人员访问。如果这是一个本地文件，唯一的选择是为每个工作机器保留一个副本。

pyspark：找不到本地文件

pyspark: couldn't find the local file

python

filesystems

hadoop

apache-spark

pyspark