我是Spark的新手，我正在Cloudera Distr for Hadoop（CDH）上学习它。我正在尝试通过Jupyter Notebook执行PageRank和BFS功能，该功能是使用以下命令启动的：
pyspark --packages graphframes:graphframes:0.1.0-spark1.6,com.databricks:spark-csv_2.11:1.2.0
以下是我试图运行的PageRank函数命令，以及错误消息：
ranks = tripGraph.pageRank(resetProbability=0.15, maxIter=5)
输出：
---------------------------------------------------------------------------
Py4JJavaError Traceback (most recent call last)
<ipython-input-20-34d549cc033e> in <module>()
----> 1 ranks = tripGraph.pageRank(resetProbability=0.15, maxIter=5)
2 ranks.vertices.orderBy(ranks.vertices.pagerank.desc()).limit(20).show()
/tmp/spark-3bdc323d-a439-4f0a-ac1d-4e64ef4d1396/userFiles-0c248c5c-29fc-44c7-bfd9-3543500350dc/graphframes_graphframes-0.1.0-spark1.6.jar/graphframes/graphframe.pyc in pageRank(self, resetProbability, sourceId, maxIter, tol)
/usr/lib/spark/python/lib/py4j-0.9-src.zip/py4j/java_gateway.py in __call__(self, *args)
811 answer = self.gateway_client.send_command(command)
812 return_value = get_return_value(
--> 813 answer, self.gateway_client, self.target_id, self.name)
814
815 for temp_arg in temp_args:
/usr/lib/spark/python/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()
/usr/lib/spark/python/lib/py4j-0.9-src.zip/py4j/protocol.py in get_return_value(answer, gateway_client, target_id, name)
306 raise Py4JJavaError(
307 "An error occurred while calling {0}{1}{2}.\n".
--> 308 format(target_id, ".", name), value)
309 else:
310 raise Py4JError(
Py4JJavaError: An error occurred while calling o106.run.
: java.lang.AbstractMethodError
at org.apache.spark.Logging$class.log(Logging.scala:50)
at org.apache.spark.graphx.lib.backport.PageRank$.log(PageRank.scala:65)
at org.apache.spark.Logging$class.logInfo(Logging.scala:58)
at org.apache.spark.graphx.lib.backport.PageRank$.logInfo(PageRank.scala:65)
at org.apache.spark.graphx.lib.backport.PageRank$.runWithOptions(PageRank.scala:148)
at org.graphframes.lib.PageRank$.run(PageRank.scala:130)
at org.graphframes.lib.PageRank.run(PageRank.scala:104)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
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)
我正在尝试使用BFS功能的相同错误消息：
filteredPaths = tripGraph.bfs(
fromExpr = "id = 'SEA'",
toExpr = "id = 'SFO'",
maxPathLength = 1)
输出：
---------------------------------------------------------------------------
Py4JJavaError Traceback (most recent call last)
<ipython-input-22-74394b11f50d> in <module>()
4 fromExpr = "id = 'SEA'",
5 toExpr = "id = 'SFO'",
----> 6 maxPathLength = 1)
7
8 filteredPaths.show()
/tmp/spark-3bdc323d-a439-4f0a-ac1d-4e64ef4d1396/userFiles-0c248c5c-29fc-44c7-bfd9-3543500350dc/graphframes_graphframes-0.1.0-spark1.6.jar/graphframes/graphframe.pyc in bfs(self, fromExpr, toExpr, edgeFilter, maxPathLength)
/usr/lib/spark/python/lib/py4j-0.9-src.zip/py4j/java_gateway.py in __call__(self, *args)
811 answer = self.gateway_client.send_command(command)
812 return_value = get_return_value(
--> 813 answer, self.gateway_client, self.target_id, self.name)
814
815 for temp_arg in temp_args:
/usr/lib/spark/python/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()
/usr/lib/spark/python/lib/py4j-0.9-src.zip/py4j/protocol.py in get_return_value(answer, gateway_client, target_id, name)
306 raise Py4JJavaError(
307 "An error occurred while calling {0}{1}{2}.\n".
--> 308 format(target_id, ".", name), value)
309 else:
310 raise Py4JError(
Py4JJavaError: An error occurred while calling o147.run.
: java.lang.AbstractMethodError
at org.apache.spark.Logging$class.log(Logging.scala:50)
at org.graphframes.lib.BFS$.log(BFS.scala:131)
at org.apache.spark.Logging$class.logInfo(Logging.scala:58)
at org.graphframes.lib.BFS$.logInfo(BFS.scala:131)
at org.graphframes.lib.BFS$.org$graphframes$lib$BFS$$run(BFS.scala:212)
at org.graphframes.lib.BFS.run(BFS.scala:126)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
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)
你能告诉我这个问题吗？
谢谢，萨西。
答案 0 :(得分：1)
您使用的是不兼容的Scala版本：
graphframes:graphframes:0.1.0-spark1.6 - Scala 2.10 com.databricks:spark-csv_2.11:1.2.0 - Scala 2.11 如果使用Scala 2.10编译Spark，则必须对所有组件使用相同的Scala版本（com.databricks:spark-csv_2.10:1.2.0）。有关详细信息，请参阅Resolving dependency problems in Apache Spark。