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#!/usr/bin/python
#coding=utf-8
Using Spark processing OSM data.¶
visit:
http://apache-spark-user-list.1001560.n3.nabble.com/Parsing-a-large-XML-file-using-Spark-td19239.html | by wangerqi@supermap.com,2016-03-21. | #### Spark-XML解析器 | Old project: https://github.com/HyukjinKwon/spark-xml.git | 已迁移到：https://github.com/databricks/spark-xml | 安装、编译：git clone https://github.com/databricks/spark-xml.git | ###### 启动时执行： $SPARK_HOME/bin/spark-shell –packages com.databricks:spark-xml_2.11:0.3.2
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import pyspark
from pyspark import SparkConf, SparkContext
sc = None
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conf = (SparkConf()
.setMaster("local")
.setAppName("MyApp")
.set("spark.executor.memory", "1g")
.set("packages","com.databricks:spark-xml_2.11:0.3.2"))
print(conf)
<pyspark.conf.SparkConf object at 0x7fdba856b5c0>
In [3]:
if sc is None:
sc = SparkContext(conf = conf)
print(type(sc))
print(sc)
<class 'pyspark.context.SparkContext'>
<pyspark.context.SparkContext object at 0x7fdba856b550>
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from pyspark.sql import SQLContext
sqlContext = SQLContext(sc)
df = sqlContext.read.format('com.databricks.spark.xml').options(rowTag='book').load('books.xml')
df.select("author", "@id").write \
.format('com.databricks.spark.xml') \
.options(rowTag='book', rootTag='books') \
.save('newbooks.xml')
---------------------------------------------------------------------------
Py4JJavaError Traceback (most recent call last)
<ipython-input-9-8f0d9ff8256d> in <module>()
2 sqlContext = SQLContext(sc)
3
----> 4 df = sqlContext.read.format('com.databricks.spark.xml').options(rowTag='book').load('books.xml')
5 df.select("author", "@id").write .format('com.databricks.spark.xml') .options(rowTag='book', rootTag='books') .save('newbooks.xml')
/home/supermap/anaconda3/envs/GISpark/lib/python3.5/site-packages/pyspark/sql/readwriter.py in load(self, path, format, schema, **options)
135 self._jreader.load(self._sqlContext._sc._jvm.PythonUtils.toSeq(path)))
136 else:
--> 137 return self._df(self._jreader.load(path))
138 else:
139 return self._df(self._jreader.load())
/home/supermap/anaconda3/envs/GISpark/lib/python3.5/site-packages/py4j/java_gateway.py in __call__(self, *args)
536 answer = self.gateway_client.send_command(command)
537 return_value = get_return_value(answer, self.gateway_client,
--> 538 self.target_id, self.name)
539
540 for temp_arg in temp_args:
/home/supermap/anaconda3/envs/GISpark/lib/python3.5/site-packages/pyspark/sql/utils.py in deco(*a, **kw)
43 def deco(*a, **kw):
44 try:
---> 45 return f(*a, **kw)
46 except py4j.protocol.Py4JJavaError as e:
47 s = e.java_exception.toString()
/home/supermap/anaconda3/envs/GISpark/lib/python3.5/site-packages/py4j/protocol.py in get_return_value(answer, gateway_client, target_id, name)
298 raise Py4JJavaError(
299 'An error occurred while calling {0}{1}{2}.\n'.
--> 300 format(target_id, '.', name), value)
301 else:
302 raise Py4JError(
Py4JJavaError: An error occurred while calling o51.load.
: java.lang.ClassNotFoundException: Failed to find data source: com.databricks.spark.xml. Please find packages at http://spark-packages.org
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.lookupDataSource(ResolvedDataSource.scala:77)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:102)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:119)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:109)
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:497)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:231)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:381)
at py4j.Gateway.invoke(Gateway.java:259)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:133)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:209)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: com.databricks.spark.xml.DefaultSource
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$$anonfun$4$$anonfun$apply$1.apply(ResolvedDataSource.scala:62)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$$anonfun$4$$anonfun$apply$1.apply(ResolvedDataSource.scala:62)
at scala.util.Try$.apply(Try.scala:161)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$$anonfun$4.apply(ResolvedDataSource.scala:62)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$$anonfun$4.apply(ResolvedDataSource.scala:62)
at scala.util.Try.orElse(Try.scala:82)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.lookupDataSource(ResolvedDataSource.scala:62)
... 14 more
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