Question

我是Pyspark的新手，我正在尝试做一个简单的计数。但它给了我这个错误。文本文件位于hdfs中。

CODE：

>>> mydata = sc.textFile("hdfs://user/poem.txt")
>>> mydata.count()

ERROR：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/spark-2.0.1-bin-hadoop2.7/python/pyspark/rdd.py", line 1008, in count
    return self.mapPartitions(lambda i: [sum(1 for _ in i)]).sum()
  File "/usr/local/lib/spark-2.0.1-bin-hadoop2.7/python/pyspark/rdd.py", line 999, in sum
    return self.mapPartitions(lambda x: [sum(x)]).fold(0, operator.add)
  File "/usr/local/lib/spark-2.0.1-bin-hadoop2.7/python/pyspark/rdd.py", line 873, in fold
    vals = self.mapPartitions(func).collect()
  File "/usr/local/lib/spark-2.0.1-bin-hadoop2.7/python/pyspark/rdd.py", line 776, in collect
    port = self.ctx._jvm.PythonRDD.collectAndServe(self._jrdd.rdd())
  File "/usr/local/lib/spark-2.0.1-bin-hadoop2.7/python/lib/py4j-0.10.3-src.zip/py4j/java_gateway.py", line 1133, in __call__
  File "/usr/local/lib/spark-2.0.1-bin-hadoop2.7/python/pyspark/sql/utils.py", line 79, in deco
    raise IllegalArgumentException(s.split(': ', 1)[1], stackTrace)
pyspark.sql.utils.IllegalArgumentException: u'java.net.UnknownHostException: user'

Answer 1

您错过了＆＃34; /＆＃34;

r = sc.textFile("hdfs://user/myFile")
r.count()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/cloudera/parcels/CDH-5.7.0-1.cdh5.7.0.p1464.1349/lib/spark/python/pyspark/rdd.py", line 1004, in count
    return self.mapPartitions(lambda i: [sum(1 for _ in i)]).sum()
  File "/opt/cloudera/parcels/CDH-5.7.0-1.cdh5.7.0.p1464.1349/lib/spark/python/pyspark/rdd.py", line 995, in sum
    return self.mapPartitions(lambda x: [sum(x)]).fold(0, operator.add)
  File "/opt/cloudera/parcels/CDH-5.7.0-1.cdh5.7.0.p1464.1349/lib/spark/python/pyspark/rdd.py", line 869, in fold
    vals = self.mapPartitions(func).collect()
  File "/opt/cloudera/parcels/CDH-5.7.0-1.cdh5.7.0.p1464.1349/lib/spark/python/pyspark/rdd.py", line 771, in collect
    port = self.ctx._jvm.PythonRDD.collectAndServe(self._jrdd.rdd())
  File "/opt/cloudera/parcels/CDH-5.7.0-1.cdh5.7.0.p1464.1349/lib/spark/python/lib/py4j-0.9-src.zip/py4j/java_gateway.py", line 813, in __call__
  File "/opt/cloudera/parcels/CDH-5.7.0-1.cdh5.7.0.p1464.1349/lib/spark/python/pyspark/sql/utils.py", line 53, in deco
    raise IllegalArgumentException(s.split(': ', 1)[1], stackTrace)
pyspark.sql.utils.IllegalArgumentException: u'java.net.UnknownHostException: user'

但是，如果你这样做

>>> r = sc.textFile("hdfs:///user/myFile")
>>> r.count()
318199

这是因为hdfs：//是URI。在完全限定语法中，它应该是hdfs：///。因此，Spark正在考虑令牌＆＃34;用户＆＃34;作为NN-Host

pyspark.sql.utils.IllegalArgumentException：u＆＃39; java.net.UnknownHostException：user＆＃39;

1 个答案: