How do I rename the file that was saved on a datalake in Azure

Question

I tried to merge two files in a Datalake using scala in data bricks and saved it back to the Datalake using the following code:

val df =sqlContext.read.format("com.databricks.spark.csv").option("header", "true").option("inferSchema", "true").load("adl://xxxxxxxx/Test/CSV") 
df.coalesce(1).write.
              format("com.databricks.spark.csv").
              mode("overwrite").
              option("header", "true").
save("adl://xxxxxxxx/Test/CSV/final_data.csv")

However the file final_data.csv is saved as a directory instead of a file with multiple files and the actual .csv file is saved as 'part-00000-tid-dddddddddd-xxxxxxxxxx.csv'.

How do I rename this file so that I can move it to another directory?

Answer 1

Got it. It can be renamed and placed into another destination using the following code. Also current files that were merged will be deleted.

val x = "Source"
val y = "Destination"
val df = sqlContext.read.format("csv")
        .option("header", "true").option("inferSchema", "true")
        .load(x+"/")
df.repartition(1).write.
   format("csv").
   mode("overwrite").
   option("header", "true").
   save(y+"/"+"final_data.csv")
dbutils.fs.ls(x).filter(file=>file.name.endsWith("csv")).foreach(f => dbutils.fs.rm(f.path,true))
dbutils.fs.mv(dbutils.fs.ls(y+"/"+"final_data.csv").filter(file=>file.name.startsWith("part-00000"))(0).path,y+"/"+"data.csv")
dbutils.fs.rm(y+"/"+"final_data.csv",true)

Answer 2

Rename file stored in ADLS Gen2 in Azure DataBricks:

We can use rename or copy method for this operation. If file starts with part-0000 or end with .csv then we can use logic. Rename : data.csv

from pyspark.sq1.functions import col

source_path ="abfss://[email protected]/sample/final_data/"

new_name="abfss://[email protected]/sample/output/data.csv"

getname = dbutils.fs.ls(source_path)

df_filelist = spark.createDataFrame(getname)

filename = df_filelist.filter (col ("name").like("%.csv%")) .select ("name") .collect)[0][0]

old_name = source_path +'/'+filename
dbutils.fs.mv (old_name, new_name)

dbutils.fs.rm(source_path+'/‘,True)