I want to load a XML file from HDFS using XML Scala API. I am trying as follows but its not recognizing the path. Could anyone let me know how we can load file from HDFS by using Scala?
import scala.xml.{NodeSeq, XML}
val xml_load = XML.loadFile("hdfs:////user/np.user/raw/xmlfile.xml")
I assume you're using Scala 2.12.x; I also assume those four slashes in hdfs:////user... are typo.
You're using method XML.loadFile(name: String); it internally uses FileInputStream. It's not possible to open an HDFS file with a plain FileInputStream. You need an input stream which supports HDFS. You can find it in org.apache.hadoop:hadoop-hdfs library.
The code then looks like this:
import org.apache.hadoop.conf.Configuration
import org.apache.hadoop.fs._
// configure properly so the code knows which Hadoop cluster to connect to
// https://hadoop.apache.org/docs/r3.2.0/api/org/apache/hadoop/conf/Configuration.html
val conf = new Configuration()
// obtain input stream instance
val hdfsPath: Path = new Path("hdfs://user/np.user/raw/xmlfile.xml")
val fs: FileSystem = hdfsPath.getFileSystem(conf)
val inputStream: FSDataInputStream = fs.open(hdfsPath)
// load XML
try {
val xml_load = XML.load(inputStream)
} finally {
// close resources; of course, this will silently swallow any exception in close() methods
inputStream.close()
fs.close()
}
I am trying to use spark streaming in reading data from one HDFS location to another
Below is my code snippet on spark-shell
But I couldn't see the files created on HDFS output directory
Can some point point how to load the files on HDFS
scala> sc.stop()
scala> import org.apache.spark.SparkConf
scala> import org.apache.spark.streaming
scala> import org.apache.spark.streaming.{StreamingContext,Seconds}
scala> val conf = new SparkConf().setMaster("local[2]").setAppName("files_word_count")
scala> val ssc = new StreamingContext(conf,Seconds(10))
scala> val DF = ssc.textFileStream("/user/cloudera/streamingcontext_dir")
scala> val words_freq = DF.flatMap(x=>(x.split(" "))).map(y=>(y,1)).reduceByKey(_+_)
scala> words_freq.saveAsTextFiles("hdfs://localhost:8020/user/cloudera/streamingcontext_dir2")
scala> ssc.start()
I have placed files on HDFS "/user/cloudera/streamingcontext_dir" and created another directory "/user/cloudera/streamingcontext_dir2" for seeing the files written
But I couldn't see the files in the output directory
Can someone point what's wrong here ?
Thanks
Sumit
Try making use of RDD here and not the entire DStream perhaps:
words_freq.foreachRDD(rdd =>
rdd.saveAsTextFile("hdfs://localhost:8020/user/cloudera/streamingcontext_dir2")
I am learning how to read and write from files in HDFS by using Spark/Scala.
I am unable to write in HDFS file, the file is created, but it's empty.
I don't know how to create a loop for writing in a file.
The code is:
import scala.collection.immutable.Map
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
// Read the adult CSV file
val logFile = "hdfs://zobbi01:9000/input/adult.csv"
val conf = new SparkConf().setAppName("Simple Application")
val sc = new SparkContext(conf)
val logData = sc.textFile(logFile, 2).cache()
//val logFile = sc.textFile("hdfs://zobbi01:9000/input/adult.csv")
val headerAndRows = logData.map(line => line.split(",").map(_.trim))
val header = headerAndRows.first
val data = headerAndRows.filter(_(0) != header(0))
val maps = data.map(splits => header.zip(splits).toMap)
val result = maps.filter(map => map("AGE") != "23")
result.foreach{
result.saveAsTextFile("hdfs://zobbi01:9000/input/test2.txt")
}
If I replace:
result.foreach{println}
Then it works!
but when using the method of (saveAsTextFile), then an error message is thrown as
<console>:76: error: type mismatch;
found : Unit
required: scala.collection.immutable.Map[String,String] => Unit
result.saveAsTextFile("hdfs://zobbi01:9000/input/test2.txt")
Any help please.
result.saveAsTextFile("hdfs://zobbi01:9000/input/test2.txt")
This is all what you need to do. You don't need to loop through all the rows.
Hope this helps!
What this does!!!
result.foreach{
result.saveAsTextFile("hdfs://zobbi01:9000/input/test2.txt")
}
RDD action cannot be triggered from RDD transformations unless special conf set.
Just use result.saveAsTextFile("hdfs://zobbi01:9000/input/test2.txt") to save to HDFS.
I f you need other formats in the file to be written, change in rdd itself before writing.
I want to list all folders within a hdfs directory using Scala/Spark.
In Hadoop I can do this by using the command: hadoop fs -ls hdfs://sandbox.hortonworks.com/demo/
I tried it with:
val conf = new Configuration()
val fs = FileSystem.get(new URI("hdfs://sandbox.hortonworks.com/"), conf)
val path = new Path("hdfs://sandbox.hortonworks.com/demo/")
val files = fs.listFiles(path, false)
But it does not seem that he looks in the Hadoop directory as i cannot find my folders/files.
I also tried with:
FileSystem.get(sc.hadoopConfiguration).listFiles(new Path("hdfs://sandbox.hortonworks.com/demo/"), true)
But this also does not help.
Do you have any other idea?
PS: I also checked this thread: Spark iterate HDFS directory but it does not work for me as it does not seem to search on hdfs directory, instead only on the local file system with schema file//.
We are using hadoop 1.4 and it doesn't have listFiles method so we use listStatus to get directories. It doesn't have recursive option but it is easy to manage recursive lookup.
val fs = FileSystem.get(new Configuration())
val status = fs.listStatus(new Path(YOUR_HDFS_PATH))
status.foreach(x=> println(x.getPath))
In Spark 2.0+,
import org.apache.hadoop.fs.{FileSystem, Path}
val fs = FileSystem.get(spark.sparkContext.hadoopConfiguration)
fs.listStatus(new Path(s"${hdfs-path}")).filter(_.isDir).map(_.getPath).foreach(println)
Hope this is helpful.
in Ajay Ahujas answer isDir is deprecated..
use isDirectory... pls see complete example and output below.
package examples
import org.apache.log4j.Level
import org.apache.spark.sql.SparkSession
object ListHDFSDirectories extends App{
val logger = org.apache.log4j.Logger.getLogger("org")
logger.setLevel(Level.WARN)
val spark = SparkSession.builder()
.appName(this.getClass.getName)
.config("spark.master", "local[*]").getOrCreate()
val hdfspath = "." // your path here
import org.apache.hadoop.fs.{FileSystem, Path}
val fs = org.apache.hadoop.fs.FileSystem.get(spark.sparkContext.hadoopConfiguration)
fs.listStatus(new Path(s"${hdfspath}")).filter(_.isDirectory).map(_.getPath).foreach(println)
}
Result :
file:/Users/user/codebase/myproject/target
file:/Users/user/codebase/myproject/Rel
file:/Users/user/codebase/myproject/spark-warehouse
file:/Users/user/codebase/myproject/metastore_db
file:/Users/user/codebase/myproject/.idea
file:/Users/user/codebase/myproject/src
I was looking for the same, however instead of HDFS, for S3.
I solved creating the FileSystem with my S3 path as below:
def getSubFolders(path: String)(implicit sparkContext: SparkContext): Seq[String] = {
val hadoopConf = sparkContext.hadoopConfiguration
val uri = new URI(path)
FileSystem.get(uri, hadoopConf).listStatus(new Path(path)).map {
_.getPath.toString
}
}
I know this question was related for HDFS, but maybe others like me will come here looking for S3 solution. Since without specifying the URI in FileSystem, it will look for HDFS ones.
java.lang.IllegalArgumentException: Wrong FS: s3://<bucket>/dummy_path
expected: hdfs://<ip-machine>.eu-west-1.compute.internal:8020
val listStatus = org.apache.hadoop.fs.FileSystem.get(new URI(url), sc.hadoopConfiguration)
.globStatus(new org.apache.hadoop.fs.Path(url))
for (urlStatus <- listStatus) {
println("urlStatus get Path:" + urlStatus.getPath())
}
val spark = SparkSession.builder().appName("Demo").getOrCreate()
val path = new Path("enter your directory path")
val fs:FileSystem = projects.getFileSystem(spark.sparkContext.hadoopConfiguration)
val it = fs.listLocatedStatus(path)
This will create an iterator it over org.apache.hadoop.fs.LocatedFileStatus that is your subdirectory
Azure Blog Storage is mapped to a HDFS location, so all the Hadoop Operations
On Azure Portal, go to Storage Account, you will find following details:
Storage account
Key -
Container -
Path pattern – /users/accountsdata/
Date format – yyyy-mm-dd
Event serialization format – json
Format – line separated
Path Pattern here is the HDFS path, you can login/putty to the Hadoop Edge Node and do:
hadoop fs -ls /users/accountsdata
Above command will list all the files. In Scala you can use
import scala.sys.process._
val lsResult = Seq("hadoop","fs","-ls","/users/accountsdata/").!!
object HDFSProgram extends App {
val uri = new URI("hdfs://HOSTNAME:PORT")
val fs = FileSystem.get(uri,new Configuration())
val filePath = new Path("/user/hive/")
val status = fs.listStatus(filePath)
status.map(sts => sts.getPath).foreach(println)
}
This is sample code to get list of hdfs files or folder present under /user/hive/
Because you're using Scala, you may also be interested in the following:
import scala.sys.process._
val lsResult = Seq("hadoop","fs","-ls","hdfs://sandbox.hortonworks.com/demo/").!!
This will, unfortunately, return the entire output of the command as a string, and so parsing down to just the filenames requires some effort. (Use fs.listStatus instead.) But if you find yourself needing to run other commands where you could do it in the command line easily and are unsure how to do it in Scala, just use the command line through scala.sys.process._. (Use a single ! if you want to just get the return code.)
I want to loop through all text files in a Hadoop dir and count all the occurrences of the word "error". Is there a way to do a hadoop fs -ls /users/ubuntu/ to list all the files in a dir with the Apache Spark Scala API?
From the given first example, the spark context seems to only access files individually through something like:
val file = spark.textFile("hdfs://target_load_file.txt")
In my problem, I do not know how many nor the names of the files in the HDFS folder beforehand. Looked at the spark context docs but couldn't find this kind of functionality.
You can use a wildcard:
val errorCount = sc.textFile("hdfs://some-directory/*")
.flatMap(_.split(" ")).filter(_ == "error").count
import org.apache.hadoop.fs.{FileSystem, FileUtil, Path}
import scala.collection.mutable.Stack
val fs = FileSystem.get( sc.hadoopConfiguration )
var dirs = Stack[String]()
val files = scala.collection.mutable.ListBuffer.empty[String]
val fs = FileSystem.get(sc.hadoopConfiguration)
dirs.push("/user/username/")
while(!dirs.isEmpty){
val status = fs.listStatus(new Path(dirs.pop()))
status.foreach(x=> if(x.isDirectory) dirs.push(x.getPath.toString) else
files+= x.getPath.toString)
}
files.foreach(println)
For a local installation, (the hdfs default path fs.defaultFS can be found by reading /etc/hadoop/core.xml):
For instance,
import org.apache.hadoop.fs.{FileSystem, Path}
val conf = sc.hadoopConfiguration
conf.set("fs.defaultFS", "hdfs://localhost:9000")
val hdfs: org.apache.hadoop.fs.FileSystem = org.apache.hadoop.fs.FileSystem.get(conf)
val fileStatus = hdfs.listStatus(new Path("hdfs://localhost:9000/foldername/"))
val fileList = fileStatus.map(x => x.getPath.toString)
fileList.foreach(println)