cloudant apache-spark访问设计文档

Question

当我只使用数据库名称时，以下方法适用于我：

database = 'databasename'

cloudantdata_df = sqlContext.read.format("com.cloudant.spark").\
option("cloudant.host", host).\
option("cloudant.username", username).\
option("cloudant.password", password).\
load(database)

cloudantdata_df.printSchema()

但是，当我尝试使用如下格式加载特定的设计文档和视图名称时：

database = 'databasename/_design/analytics/_view/invBA'

我得到了下面的java异常：

Py4JJavaError: An error occurred while calling o54.load.
: java.lang.RuntimeException: Database databasename/_design/analytics/_view/invBA request error: {"error":"method_not_allowed","reason":"Only GET,POST,HEAD allowed"}

at    com.cloudant.spark.common.JsonStoreDataAccess.getQueryResult(JsonStoreDataAccess.scala:176)
at com.cloudant.spark.common.JsonStoreDataAccess.getMany(JsonStoreDataAccess.scala:85)
at com.cloudant.spark.DefaultSource.create(DefaultSource.scala:114)
at com.cloudant.spark.DefaultSource.createRelation(DefaultSource.scala:100)
at com.cloudant.spark.DefaultSource.createRelation(DefaultSource.scala:94)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:158)
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:95)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:507)
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:785)

有没有办法查看特定的设计文档视图名称？

Answer 1

在github中，有一个如何加载视图的示例：https://github.com/cloudant-labs/spark-cloudant/blob/master/examples/python/CloudantDF.py#L74

您需要使用view选项。在您的特定情况下，它将是：

cloudantdata_df = sqlContext.read.format("com.cloudant.spark").\
option("cloudant.host", host).\
option("cloudant.username", username).\
option("cloudant.password", password).\
option("view","_design/analytics/_view/invBA").load(database)