azure-cosmosdb-spark

Preview connector for Azure CosmosDB and Apache Spark.

Note, we've updated this repo to reflect the update to Cosmos DB from DocumentDB

Official instructions for using the connector are included in the Cosmos DB documentation, in the Accelerate real-time big-data analytics with the Spark to Cosmos DB connector article.

This project provides a client library that allows Azure Cosmos DB to act as an input source or output sink for Spark jobs.

This connector is experimental and is provided as a public technical preview only

Officially supports Spark version: 2.0.2, Scala version: 2.11, Azure DocumentDB Java SDK: 1.10.0

There are currently two approaches to connect Apache Spark to Azure Cosmos DB:

• Using pyDocumentDB
• Using azure-cosmosdb-spark - a Java-based Spark to Cosmos DB connector based utilizing the Azure DocumentDB Java SDK

See the user guide for more information about the API.

Requirements

• Apache Spark 2.0+
• Java Version >= 7.0
• If using Python
  • pyDocumentDB package
  • Python >= 2.7 or Python >= 3.3
• If using Scala
  • Azure DocumentDB Java SDK 1.10.0

For those using HDInsight, this has been tested on HDI 3.5

How to connect Spark to Cosmos DB using pyDocumentDB

The current pyDocumentDB SDK allows us to connect Spark to Cosmos DB. Here's a small code snippet that queries for airport codes from the DoctorWho Azure Cosmos DB database; the results are in the df DataFrame.

# Import Necessary Libraries
import pydocumentdb
from pydocumentdb import document_client
from pydocumentdb import documents
import datetime

# Configuring the connection policy (allowing for endpoint discovery)
connectionPolicy = documents.ConnectionPolicy()
connectionPolicy.EnableEndpointDiscovery 
connectionPolicy.PreferredLocations = ["Central US", "East US 2", "Southeast Asia", "Western Europe","Canada Central"]

# Set keys to connect to Cosmos DB 
masterKey = 'SPSVkSfA7f6vMgMvnYdzc1MaWb65v4VQNcI2Tp1WfSP2vtgmAwGXEPcxoYra5QBHHyjDGYuHKSkguHIz1vvmWQ==' 
host = 'https://doctorwho.documents.azure.com:443/'
client = document_client.DocumentClient(host, {'masterKey': masterKey}, connectionPolicy)

# Configure Database and Collections
databaseId = 'airports'
collectionId = 'codes'

# Configurations the Cosmos DB client will use to connect to the database and collection
dbLink = 'dbs/' + databaseId
collLink = dbLink + '/colls/' + collectionId

# Set query parameter
querystr = "SELECT c.City FROM c WHERE c.State='WA'"

# Query documents
query = client.QueryDocuments(collLink, querystr, options=None, partition_key=None)

# Query for partitioned collections
# query = client.QueryDocuments(collLink, querystr, options= { 'enableCrossPartitionQuery': True }, partition_key=None)

# Push into list `elements`
elements = list(query)

# Create `df` Spark DataFrame from `elements` Python list
df = spark.createDataFrame(elements)

How to connect Spark to Cosmos DB using azure-cosmosdb-spark

The azure-cosmosdb-spark connector connects Apache Spark to Cosmos DB using the Azure DocumentDB Java SDK. Here's a small code snippet that queries for flight data from the DoctorWho Azure Cosmos DB database; the results are in the df DataFrame.

Python

# Base Configuration
flightsConfig = {
"Endpoint" : "https://doctorwho.documents.azure.com:443/",
"Masterkey" : "SPSVkSfA7f6vMgMvnYdzc1MaWb65v4VQNcI2Tp1WfSP2vtgmAwGXEPcxoYra5QBHHyjDGYuHKSkguHIz1vvmWQ==",
"Database" : "DepartureDelays",
"preferredRegions" : "Central US;East US2",
"Collection" : "flights_pcoll", 
"SamplingRatio" : "1.0",
"schema_samplesize" : "1000",
"query_pagesize" : "2147483647",
"query_custom" : "SELECT c.date, c.delay, c.distance, c.origin, c.destination FROM c"
}

# Connect via Spark connector to create Spark DataFrame
flights = spark.read.format("com.microsoft.azure.cosmosdb.spark").options(**flightsConfig).load()
flights.count()

Scala

// Import Necessary Libraries
import org.joda.time._
import org.joda.time.format._

// Earlier versions of the connector
// import com.microsoft.azure.documentdb.spark.schema._
// import com.microsoft.azure.documentdb.spark._
// import com.microsoft.azure.documentdb.spark.config.Config

// Current version of the connector
import com.microsoft.azure.cosmosdb.spark.schema._
import com.microsoft.azure.cosmosdb.spark._
import com.microsoft.azure.cosmosdb.spark.config.Config

// Configure connection to your collection
val readConfig2 = Config(Map("Endpoint" -> "https://doctorwho.documents.azure.com:443/",
"Masterkey" -> "SPSVkSfA7f6vMgMvnYdzc1MaWb65v4VQNcI2Tp1WfSP2vtgmAwGXEPcxoYra5QBHHyjDGYuHKSkguHIz1vvmWQ==",
"Database" -> "DepartureDelays",
"preferredRegions" -> "Central US;East US2;",
"Collection" -> "flights_pcoll", 
"SamplingRatio" -> "1.0"))

// Create collection connection 
// Earlier version of the connector
// val coll = spark.sqlContext.read.DocumentDB(readConfig2)

// Current version of the connector
val coll = spark.sqlContext.read.cosmosDB(readConfig2)
coll.createOrReplaceTempView("c")

// Queries
var query = "SELECT c.date, c.delay, c.distance, c.origin, c.destination FROM c WHERE c.origin = 'SEA'"
val df = spark.sql(query)

// Run DF query (count)
df.count()

How to build the connector

Currently, this connector project uses maven so to build without dependencies, you can run:

mvn clean package

Download the connector

You can also download the latest versions of the jar within the releases folder.

The current version of the Spark connector is azure-cosmosdb-spark_0.0.3_2.0.2_2.11:

• azure-cosmosdb-spark version: 0.0.3
• Apache Spark version: 2.0.2
• Scala version: 2.11

Download from Maven

You can also download the JARs from maven:

• azure-cosmosdb-spark_0.0.3-2.2.0_2.11
  • azure-cosmosdb-spark version: 0.0.3
  • Apache Spark version: 2.2.0
  • Scala version: 2.11
• azure-cosmosdb-spark_0.0.3-2.0.2_2.11
  • azure-cosmosdb-spark version: 0.0.3
  • Apache Spark version: 2.0.2
  • Scala version: 2.11
• azure-cosmosdb-spark_0.0.3-2.2.0_2.10
  • azure-cosmosdb-spark version: 0.0.3
  • Apache Spark version: 2.2.0
  • Scala version: 2.10
• azure-cosmosdb-spark_0.0.3-2.0.2_2.10
  • azure-cosmosdb-spark version: 0.0.3
  • Apache Spark version: 2.0.2
  • Scala version: 2.10