Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

SPARK-22833 [Improvement] in SparkHive Scala Examples #20018

Closed
wants to merge 8 commits into from
Closed

SPARK-22833 [Improvement] in SparkHive Scala Examples #20018

Changes from all commits
Commits
Show all changes
8 commits
Select commit Hold shift + click to select a range
9d9b42b
SPARK-22833 [Improvement] in SparkHive Scala Examples
chetkhatri Dec 19, 2017
0bbad8c
[SPARK-22833] [Improvement] Example code enabled for documentation
chetkhatri Dec 19, 2017
ee53208
SPARK-22833 [Improvement] in SparkHive Scala Example - DDL for partit…
chetkhatri Dec 20, 2017
2f98a3c
SPARK-22833 [Improvement] - reverted mistake on on-off example
chetkhatri Dec 20, 2017
69a4145
SPARK-22833 [Improvement] in SparkHive Scala example - change in comm…
chetkhatri Dec 21, 2017
b95587d
SPARK-22833 [Improvement] in SparkHive Scala example - DDL used in sql
chetkhatri Dec 21, 2017
9b8d188
SPARK-22833 [Improvement] in SparkHive Scala example - location added…
chetkhatri Dec 21, 2017
c3dda1b
SPARK-22833 [Improvement] in SparkHive Scala Example - comments rephr…
chetkhatri Dec 22, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
38 changes: 35 additions & 3 deletions examples/src/main/scala/org/apache/spark/examples/sql/hive/SparkHiveExample.scala
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -19,8 +19,7 @@ package org.apache.spark.examples.sql.hive
// $example on:spark_hive$
import java.io.File

import org.apache.spark.sql.Row
import org.apache.spark.sql.SparkSession
import org.apache.spark.sql.{Row, SaveMode, SparkSession}
// $example off:spark_hive$

object SparkHiveExample {
Expand Down Expand Up @@ -102,8 +101,41 @@ object SparkHiveExample {
// | 4| val_4| 4| val_4|
// | 5| val_5| 5| val_5|
// ...
// $example off:spark_hive$

// Create Hive managed table with Parquet
sql("CREATE TABLE records(key int, value string) STORED AS PARQUET")
// Save DataFrame to Hive managed table as Parquet format
val hiveTableDF = sql("SELECT * FROM records")
hiveTableDF.write.mode(SaveMode.Overwrite).saveAsTable("database_name.records")
// Create External Hive table with Parquet
sql("CREATE EXTERNAL TABLE records(key int, value string) " +
"STORED AS PARQUET LOCATION '/user/hive/warehouse/'")
// to make Hive Parquet format compatible with Spark Parquet format
spark.sqlContext.setConf("spark.sql.parquet.writeLegacyFormat", "true")

// Multiple Parquet files could be created accordingly to volume of data under directory given.
val hiveExternalTableLocation = "/user/hive/warehouse/database_name.db/records"

// Save DataFrame to Hive External table as compatible Parquet format
hiveTableDF.write.mode(SaveMode.Overwrite).parquet(hiveExternalTableLocation)

// Turn on flag for Dynamic Partitioning
spark.sqlContext.setConf("hive.exec.dynamic.partition", "true")
spark.sqlContext.setConf("hive.exec.dynamic.partition.mode", "nonstrict")

// You can create partitions in Hive table, so downstream queries run much faster.
hiveTableDF.write.mode(SaveMode.Overwrite).partitionBy("key")
.parquet(hiveExternalTableLocation)

// Reduce number of files for each partition by repartition
hiveTableDF.repartition($"key").write.mode(SaveMode.Overwrite)
.partitionBy("key").parquet(hiveExternalTableLocation)

// Control the number of files in each partition by coalesce
hiveTableDF.coalesce(10).write.mode(SaveMode.Overwrite)
.partitionBy("key").parquet(hiveExternalTableLocation)
// $example off:spark_hive$

spark.stop()
}
}