附加到一个数据框架
要添加到一个数据帧，使用union方法。%scala val firstDF = spark.range(3).toDF("myCol") val newRow = Seq(20) val appendded = firstDF.union(newRow.toDF()) display(appendded) %python firstDF = spark.range(3).toDF("myCol") newRow = spark.createDataFrame([[20]]) appendded = firstDF.union(newRow) display(appendded)…
简化链式转换
有时候你可能需要在你的DataFrame上执行多个转换:_ import org.apache.spark.sql.DataFrame val testDf =(1到10). todf ("col") def func0(x: Int => Int, y: Int)(in: DataFrame): DataFrame = {in. apache.spark.sql.DataFrame val testDf =(1到10). todf ("col") def func0(x: Int => Int, y: Int)filter('col > x(y))} def func1(x: Int)(in: DataFrame): DataFrame = {in.sele…
某些文件中的模式不兼容
Spark job在读取Parquet文件时出现如下异常而失败:Error in SQL statement: SparkException: job aborted due to stage failure: Task 20 in stage 11227.0 failed 4 times, most recent failure: Lost Task 20.3 in stage 11227.0 (TID 868031, 10.111.245.219, executor 31): java.lang.UnsupportedOperationException: org.…
Apache Spark会话在DBConnect中为空
当你得到sparkSession is null错误消息时，你正在尝试使用Databricks Connect (AWS | Azure | GCP)运行你的代码。java.lang.AssertionError: assertion failed: sparkSession is null while trying to executeCollectResult at scala.Predef$.assert(Predef.scala:170) at org.apache.spark.sql. execukplan .executeCollectResult(…
在集群上安装Cartopy时出错
您正在尝试在集群上安装Cartopy，并收到ManagedLibraryInstallFailed错误消息。java.lang.RuntimeException: ManagedLibraryInstallFailed: org.apache.spark.SparkException: Process List(/databricks/python/bin/pip, install, cartopy==0.17.0，——disable-pip-version-check) exited with code 1。ERROR: Command ERROR out…
拟合Apache SparkML模型会抛出错误
问题Databricks在拟合SparkML模型或Pipeline时抛出错误:org.apache.spark.SparkException: Job aborted to stage failure: Task 0 in stage 162.0 failed 4次，最近的失败:Lost Task 0.3 in stage 162.0 (TID 168, 10.205.250.130, executor 1): org.apache.spark.SparkException: failed to execute user - defined function($anonfu…
H2O。ai气泡水集群不可达
问题你在尝试初始化H2O。当你得到H2OClusterNotReachableException错误消息时，ai 's Sparkling Water on Databricks Runtime 7.0及以上。%python导入ai.h2o.sparkling。_ val h2oContext = h2oContext . getorcreate () ai.h2o. sparkle .backend.exceptions。H2OClusterNotReachableException: H2O cluster X.X.X.X:54321 - sparkle -water-ro…
KNN模型使用pyfunc返回ModuleNotFoundError或FileNotFoundError
你已经使用KNeighborsClassifier创建了一个Sklearn模型，并使用pyfunc来运行预测。例如:%python import mlflow。Pyfunc pyfunc_udf = mlflow.pyfunc。Spark_udf (spark, model_uri=model_uri, result_type='string') predicted_df = merge。withColumn(" forecast "， pyfunc_udf(*merge.columns[1:])) predicted_df.collect()
访问MLflow实验工件时出现PERMISSION_DENIED错误
当您试图使用MLflow客户端访问MLflow工件时，您会得到一个PERMISSION_DENIED错误。RestException: PERMISSION_DENIED: User < User > does not have permission to 'View' experiment with id < experimental -id> or RestException: PERMISSION_DENIED: User < User > does not have permission to 'Edit' experiment with id
RStudio服务器后端连接错误
当使用RStudio服务器时，出现后端连接错误。系统错误。setenv(EXISTING_SPARKR_BACKEND_PORT = system(paste0("wget - qo - 'http://localhost:6061/?type=\"com.databricks.backend.common.rpc.DriverMessages$StartRStudioSparkRBackend\"'——post-data='{\"@class\":\"com.databricks.backend.common.rpc.DriverMessages$StartRStudioSparkRB…