Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
*
* * Licensed to the Apache Software Foundation (ASF) under one or more
* * contributor license agreements. See the NOTICE file distributed with
* * this work for additional information regarding copyright ownership.
* * The ASF licenses this file to You under the Apache License, Version 2.0
* * (the "License"); you may not use this file except in compliance with
* * the License. You may obtain a copy of the License at
* *
* * http://www.apache.org/licenses/LICENSE-2.0
* *
* * Unless required by applicable law or agreed to in writing, software
* * distributed under the License is distributed on an "AS IS" BASIS,
* * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* * See the License for the specific language governing permissions and
* * limitations under the License.
*
*
*/
package com.ebiznext.comet.job.ingest
import com.ebiznext.comet.config.Settings
import com.ebiznext.comet.schema.handlers.{SchemaHandler, StorageHandler}
import com.ebiznext.comet.schema.model._
import org.apache.hadoop.fs.Path
import org.apache.hadoop.io.{LongWritable, Text}
import org.apache.hadoop.mapred.TextInputFormat
import org.apache.spark.rdd.RDD
import org.apache.spark.sql._
import org.apache.spark.sql.types.{StringType, StructField, StructType}
import scala.util.{Failure, Success, Try}
/** Main class to ingest delimiter separated values file
*
* @param domain : Input Dataset Domain
* @param schema : Input Dataset Schema
* @param types : List of globally defined types
* @param path : Input dataset path
* @param storageHandler : Storage Handler
*/
class PositionIngestionJob(
domain: Domain,
schema: Schema,
types: List[Type],
path: List[Path],
storageHandler: StorageHandler,
schemaHandler: SchemaHandler
)(implicit settings: Settings)
extends DsvIngestionJob(domain, schema, types, path, storageHandler, schemaHandler) {
/** Load dataset using spark csv reader and all metadata. Does not infer schema.
* columns not defined in the schema are dropped fro the dataset (require datsets with a header)
*
* @return Spark DataFrame where each row holds a single string
*/
override def loadDataSet(): Try[DataFrame] = {
try {
val dfIn = metadata.getEncoding().toUpperCase match {
case "UTF-8" => session.read.text(path.map(_.toString): _*)
case _ => {
val rdd = PositionIngestionUtil.loadDfWithEncoding(session, path, metadata.getEncoding())
val schema: StructType = StructType(Array(StructField("value", StringType)))
session.createDataFrame(rdd.map(line => Row.fromSeq(Seq(line))), schema)
}
}
logger.debug(dfIn.schema.treeString)
val df = applyIgnore(dfIn)
metadata.withHeader match {
case Some(true) =>
Failure(new Exception("No Header allowed for Position File Format "))
case Some(false) | None =>
Success(df)
}
} catch {
case e: Exception =>
Failure(e)
}
}
/** Apply the schema to the dataset. This is where all the magic happen
* Valid records are stored in the accepted path / table and invalid records in the rejected path / table
*
* @param input : Spark Dataset
*/
override def ingest(input: DataFrame): (RDD[_], RDD[_]) = {
val dataset: DataFrame =
PositionIngestionUtil.prepare(session, input, schema.attributesWithoutScript)
def reorderAttributes(): List[Attribute] = {
val attributesMap =
schema.attributesWithoutScript.map(attr => (attr.name, attr)).toMap
dataset.columns.map(colName => attributesMap(colName)).toList
}
val orderedAttributes = reorderAttributes()
def reorderTypes(): (List[Type], StructType) = {
val mapTypes: Map[String, Type] = types.map(tpe => tpe.name -> tpe).toMap
val (tpes, sparkFields) = orderedAttributes.map { attribute =>
val tpe = mapTypes(attribute.`type`)
(tpe, tpe.sparkType(attribute.name, !attribute.required, attribute.comment))
}.unzip
(tpes, StructType(sparkFields))
}
val (orderedTypes, orderedSparkTypes) = reorderTypes()
val (rejectedRDD, acceptedRDD) = rowValidator().validate(
session,
dataset,
orderedAttributes,
orderedTypes,
orderedSparkTypes
)
saveRejected(rejectedRDD)
saveAccepted(acceptedRDD, orderedSparkTypes)
(rejectedRDD, acceptedRDD)
}
}
/** The Spark task that run on each worker
*/
object PositionIngestionUtil {
def loadDfWithEncoding(session: SparkSession, path: List[Path], encoding: String) = {
path
.map(_.toString)
.map(
session.sparkContext
.hadoopFile[LongWritable, Text, TextInputFormat](_)
.map(pair => new String(pair._2.getBytes, 0, pair._2.getLength, encoding))
)
.fold(session.sparkContext.emptyRDD)((r1, r2) => r1.union(r2))
}
def prepare(session: SparkSession, input: DataFrame, attributes: List[Attribute]) = {
def getRow(inputLine: String, positions: List[Position]): Row = {
val columnArray = new Array[String](positions.length)
val inputLen = inputLine.length
for (i <- positions.indices) {
val first = positions(i).first
val last = positions(i).last + 1
columnArray(i) = if (last <= inputLen) inputLine.substring(first, last) else ""
}
Row.fromSeq(columnArray)
}
val positions = attributes.map(_.position.get)
val fieldTypeArray = new Array[StructField](positions.length)
for (i <- attributes.indices) {
fieldTypeArray(i) = StructField(s"col$i", StringType)
}
val rdd = input.rdd.map { row => getRow(row.getString(0), positions) }
val dataset =
session.createDataFrame(rdd, StructType(fieldTypeArray)).toDF(attributes.map(_.name): _*)
dataset
}
}
