submissions_2_parquet_part2.py

   1 #!/usr/bin/env python3
   2
   3 # spark script to make sorted, and partitioned parquet files
   4
   5 from pyspark.sql import functions as f
   6 from pyspark.sql import SparkSession
   7
   8 spark = SparkSession.builder.getOrCreate()
   9
  10 sc = spark.sparkContext
  11
  12 conf = SparkConf().setAppName("Reddit submissions to parquet")
  13 conf = conf.set("spark.sql.shuffle.partitions",2000)
  14 conf = conf.set('spark.sql.crossJoin.enabled',"true")
  15 conf = conf.set('spark.debug.maxToStringFields',200)
  16 sqlContext = pyspark.SQLContext(sc)
  17
  18 df = spark.read.parquet("/gscratch/comdata/output/reddit_submissions.parquet_temp")
  19
  20 df = df.withColumn("subreddit_2", f.lower(f.col('subreddit')))
  21 df = df.drop('subreddit')
  22 df = df.withColumnRenamed('subreddit_2','subreddit')
  23 df = df.withColumnRenamed("created_utc","CreatedAt")
  24 df = df.withColumn("Month",f.month(f.col("CreatedAt")))
  25 df = df.withColumn("Year",f.year(f.col("CreatedAt")))
  26 df = df.withColumn("Day",f.dayofmonth(f.col("CreatedAt")))
  27 df = df.withColumn("subreddit_hash",f.sha2(f.col("subreddit"), 256)[0:3])
  28
  29 # next we gotta resort it all.
  30 df = df.repartition("subreddit")
  31 df2 = df.sort(["subreddit","CreatedAt","id"],ascending=True)
  32 df2 = df.sortWithinPartitions(["subreddit","CreatedAt","id"],ascending=True)
  33 df2.write.parquet("/gscratch/comdata/output/reddit_submissions_by_subreddit.parquet", partitionBy=["Year",'Month'], mode='overwrite')
  34
  35
  36 # # we also want to have parquet files sorted by author then reddit.
  37 df = df.repartition("author")
  38 df3 = df.sort(["author","CreatedAt","id"],ascending=True)
  39 df3 = df.sortWithinPartitions(["author","CreatedAt","id"],ascending=True)
  40 df3.write.parquet("/gscratch/comdata/output/reddit_submissions_by_author.parquet", partitionBy=["Year",'Month'], mode='overwrite')
  41
  42 os.remove("/gscratch/comdata/output/reddit_submissions.parquet_temp")