Componente Hudi facoltativo di Dataproc

#!/usr/bin/env python
"""Pyspark Hudi test."""

import sys
from pyspark.sql import SparkSession


def create_hudi_table(spark, table_name, table_uri):
  """Creates Hudi table."""
  create_table_sql = f"""
    CREATE TABLE IF NOT EXISTS {table_name} (
      uuid string,
      begin_lat double,
      begin_lon double,
      end_lat double,
      end_lon double,
      driver string,
      rider string,
      fare double,
      partitionpath string,
      ts long
    ) USING hudi
    LOCATION '{table_uri}'
    TBLPROPERTIES (
      type = 'cow',
      primaryKey = 'uuid',
      preCombineField = 'ts'
    )
    PARTITIONED BY (partitionpath)
  """
  spark.sql(create_table_sql)


def generate_test_dataframe(spark, n_rows):
  """Generates test dataframe with Hudi's built-in data generator."""
  sc = spark.sparkContext
  utils = sc._jvm.org.apache.hudi.QuickstartUtils
  data_generator = utils.DataGenerator()
  inserts = utils.convertToStringList(data_generator.generateInserts(n_rows))
  return spark.read.json(sc.parallelize(inserts, 2))


def write_hudi_table(table_name, table_uri, df):
  """Writes Hudi table."""
  hudi_options = {
      'hoodie.table.name': table_name,
      'hoodie.datasource.write.recordkey.field': 'uuid',
      'hoodie.datasource.write.partitionpath.field': 'partitionpath',
      'hoodie.datasource.write.table.name': table_name,
      'hoodie.datasource.write.operation': 'upsert',
      'hoodie.datasource.write.precombine.field': 'ts',
      'hoodie.upsert.shuffle.parallelism': 2,
      'hoodie.insert.shuffle.parallelism': 2,
  }
  df.write.format('hudi').options(**hudi_options).mode('append').save(table_uri)


def query_commit_history(spark, table_name, table_uri):
  tmp_table = f'{table_name}_commit_history'
  spark.read.format('hudi').load(table_uri).createOrReplaceTempView(tmp_table)
  query = f"""
    SELECT DISTINCT(_hoodie_commit_time)
    FROM {tmp_table}
    ORDER BY _hoodie_commit_time
    DESC
  """
  return spark.sql(query)


def read_hudi_table(spark, table_name, table_uri, commit_ts=''):
  """Reads Hudi table at the given commit timestamp."""
  if commit_ts:
    options = {'as.of.instant': commit_ts}
  else:
    options = {}
  tmp_table = f'{table_name}_snapshot'
  spark.read.format('hudi').options(**options).load(
      table_uri
  ).createOrReplaceTempView(tmp_table)
  query = f"""
    SELECT _hoodie_commit_time, begin_lat, begin_lon,
        driver, end_lat, end_lon, fare, partitionpath,
        rider, ts, uuid
    FROM {tmp_table}
  """
  return spark.sql(query)


def main():
  """Test create write and read Hudi table."""
  if len(sys.argv) != 3:
    raise Exception('Expected arguments: <table_name> <table_uri>')

  table_name = sys.argv[1]
  table_uri = sys.argv[2]

  app_name = f'pyspark-hudi-test_{table_name}'
  print(f'Creating Spark session {app_name} ...')
  spark = SparkSession.builder.appName(app_name).getOrCreate()
  spark.sparkContext.setLogLevel('WARN')

  print(f'Creating Hudi table {table_name} at {table_uri} ...')
  create_hudi_table(spark, table_name, table_uri)

  print('Generating test data batch 1...')
  n_rows1 = 10
  input_df1 = generate_test_dataframe(spark, n_rows1)
  input_df1.show(truncate=False)

  print('Writing Hudi table, batch 1 ...')
  write_hudi_table(table_name, table_uri, input_df1)

  print('Generating test data batch 2...')
  n_rows2 = 10
  input_df2 = generate_test_dataframe(spark, n_rows2)
  input_df2.show(truncate=False)

  print('Writing Hudi table, batch 2 ...')
  write_hudi_table(table_name, table_uri, input_df2)

  print('Querying commit history ...')
  commits_df = query_commit_history(spark, table_name, table_uri)
  commits_df.show(truncate=False)
  previous_commit_ts = commits_df.collect()[1]._hoodie_commit_time

  print('Reading the Hudi table snapshot at the latest commit ...')
  output_df1 = read_hudi_table(spark, table_name, table_uri)
  output_df1.show(truncate=False)

  print(f'Reading the Hudi table snapshot at {previous_commit_ts} ...')
  output_df2 = read_hudi_table(spark, table_name, table_uri, previous_commit_ts)
  output_df2.show(truncate=False)

  print('Stopping Spark session ...')
  spark.stop()

  print('All done')


main()