Adding bulk load for Spark (DataBricks)

DESCRIPTION

@@ -48,7 +48,8 @@ Suggests:
     odbc,
     duckdb,
     pool,
-    ParallelLogger
+    ParallelLogger,
+    AzureStor
 License: Apache License
 VignetteBuilder: knitr
 URL: https://ohdsi.github.io/DatabaseConnector/, https://github.com/OHDSI/DatabaseConnector

DatabaseConnector.Rproj

@@ -1,4 +1,5 @@
 Version: 1.0
+ProjectId: 9d51e576-41a3-432f-b696-8bfdc3eed676
 
 RestoreWorkspace: No
 SaveWorkspace: No

R/BulkLoad.R

@@ -62,6 +62,25 @@
       return(FALSE)
     }
     return(TRUE)
+  } else if (dbms(connection) == "spark") {
+    envSet <- FALSE
+    container <- FALSE
+
+    if (Sys.getenv("AZR_STORAGE_ACCOUNT") != "" && Sys.getenv("AZR_ACCOUNT_KEY") != "" && Sys.setenv("AZR_CONTAINER_NAME") != "") {
+      envSet <- TRUE
+    }
+
+    # List storage containers to confirm the container
+    # specified in the configuration exists
+    ensure_installed("AzureStor")
+    azureEndpoint <- getAzureEndpoint()
+    containerList <- getAzureContainerNames(azureEndpoint)
+
+    if (Sys.getenv("AZR_CONTAINER_NAME") %in% containerList) {
+      container <- TRUE
+    }
+
+    return(envSet & container)
   } else {
     return(FALSE)
   }
@@ -72,6 +91,18 @@
   return(if (sshUser == "") "root" else sshUser)
 }
 
+getAzureEndpoint <- function() {
+  azureEndpoint <- AzureStor::storage_endpoint(
+    paste0("https://", Sys.getenv("AZR_STORAGE_ACCOUNT"), ".dfs.core.windows.net"),
+    key = Sys.getenv("AZR_ACCOUNT_KEY")
+  )
+  return(azureEndpoint)  
+}
+
+getAzureContainerNames <- function(azureEndpoint) {
+  return(names(AzureStor::list_storage_containers(azureEndpoint)))
+}
+
 countRows <- function(connection, sqlTableName) {
   sql <- "SELECT COUNT(*) FROM @table"
   count <- renderTranslateQuerySql(
@@ -354,3 +385,53 @@
   delta <- Sys.time() - startTime
   inform(paste("Bulk load to PostgreSQL took", signif(delta, 3), attr(delta, "units")))
 }
+
+bulkLoadSpark <- function(connection, sqlTableName, data) {
+  ensure_installed("AzureStor")
+  logTrace(sprintf("Inserting %d rows into table '%s' using DataBricks bulk load", nrow(data), sqlTableName))
+  start <- Sys.time()
+
+  csvFileName <- tempfile("spark_insert_", fileext = ".csv")
+  write.csv(x = data, na = "", file = csvFileName, row.names = FALSE, quote = TRUE)
+  on.exit(unlink(csvFileName))
+
+  azureEndpoint <- getAzureEndpoint()
+  containers <- AzureStor::list_storage_containers(azureEndpoint)
+  targetContainer <- containers[[Sys.getenv("AZR_CONTAINER_NAME")]]
+  AzureStor::storage_upload(
+    targetContainer, 
+    src=csvFileName, 
+    dest=csvFileName
+  )  
+
+  on.exit(
+    AzureStor::delete_storage_file(
+      targetContainer, 
+      file = csvFileName,
+      confirm = FALSE
+    ),
+    add = TRUE
+  )
+
+  sql <- SqlRender::loadRenderTranslateSql(
+    sqlFilename = "sparkCopy.sql",
+    packageName = "DatabaseConnector",
+    dbms = "spark",
+    sqlTableName = sqlTableName,
+    fileName = basename(csvFileName),
+    azureAccountKey = Sys.getenv("AZR_ACCOUNT_KEY"),
+    azureStorageAccount = Sys.getenv("AZR_STORAGE_ACCOUNT")
+  )
+
+  tryCatch(
+    {
+      DatabaseConnector::executeSql(connection = connection, sql = sql, reportOverallTime = FALSE)
+    },
+    error = function(e) {
+      abort("Error in DataBricks bulk upload. Please check DataBricks/Azure Storage access.")
+    }
+  )
+  delta <- Sys.time() - start
+  inform(paste("Bulk load to DataBricks took", signif(delta, 3), attr(delta, "units")))
+}
+

R/InsertTable.R

@@ -121,6 +121,13 @@
 #' "some_aws_region", "AWS_BUCKET_NAME" = "some_bucket_name", "AWS_OBJECT_KEY" = "some_object_key",
 #' "AWS_SSE_TYPE" = "server_side_encryption_type").
 #'
+#' Spark (DataBricks): The MPP bulk loading relies upon the AzureStor library
+#' to test a connection to an Azure ADLS Gen2 storage container using Azure credentials. 
+#' Credentials are configured directly into the System Environment using the 
+#' following keys: Sys.setenv("AZR_STORAGE_ACCOUNT" =
+#' "some_azure_storage_account", "AZR_ACCOUNT_KEY" = "some_secret_account_key", "AZR_CONTAINER_NAME" =
+#' "some_container_name").
+#'
 #' PDW: The MPP bulk loading relies upon the client
 #' having a Windows OS and the DWLoader exe installed, and the following permissions granted: --Grant
 #' BULK Load permissions - needed at a server level USE master; GRANT ADMINISTER BULK OPERATIONS TO
@@ -308,6 +315,8 @@
       bulkLoadHive(connection, sqlTableName, sqlFieldNames, data)
     } else if (dbms == "postgresql") {
       bulkLoadPostgres(connection, sqlTableName, sqlFieldNames, sqlDataTypes, data)
+    } else if (dbms == "spark") {
+      bulkLoadSpark(connection, sqlTableName, data)
     }
   } else if (useCtasHack) {
     # Inserting using CTAS hack ----------------------------------------------------------------

extras/TestBulkLoad.R

@@ -114,3 +114,37 @@ all.equal(data, data2)
 
 renderTranslateExecuteSql(connection, "DROP TABLE scratch_mschuemi.insert_test;")
 disconnect(connection)
+
+
+# Spark ------------------------------------------------------------------------------
+# Assumes Spark (DataBricks) environmental variables have been set
+options(sqlRenderTempEmulationSchema = Sys.getenv("DATABRICKS_SCRATCH_SCHEMA"))
+databricksConnectionString <- paste0("jdbc:databricks://", Sys.getenv('DATABRICKS_HOST'), "/default;transportMode=http;ssl=1;AuthMech=3;httpPath=", Sys.getenv('DATABRICKS_HTTP_PATH'))
+connectionDetails <- createConnectionDetails(dbms = "spark",
+                                             connectionString = databricksConnectionString,
+                                             user = "token",
+                                             password = Sys.getenv("DATABRICKS_TOKEN"))
+
+
+connection <- connect(connectionDetails)
+system.time(
+  insertTable(connection = connection,
+              tableName = "scratch.scratch_asena5.insert_test",
+              data = data,
+              dropTableIfExists = TRUE,
+              createTable = TRUE,
+              tempTable = FALSE,
+              progressBar = TRUE,
+              camelCaseToSnakeCase = TRUE,
+              bulkLoad = TRUE)
+)
+data2 <- querySql(connection, "SELECT * FROM scratch.scratch_asena5.insert_test;", snakeCaseToCamelCase = TRUE, integer64AsNumeric = FALSE)
+
+data <- data[order(data$id), ]
+data2 <- data2[order(data2$id), ]
+row.names(data) <- NULL
+row.names(data2) <- NULL
+all.equal(data, data2)
+
+renderTranslateExecuteSql(connection, "DROP TABLE scratch.scratch_asena5.insert_test;")
+disconnect(connection)

inst/sql/sql_server/sparkCopy.sql

@@ -0,0 +1,10 @@
+COPY INTO @sqlTableName
+FROM 'abfss://@azureStorageAccount.dfs.core.windows.net/@fileName'
+WITH (
+ CREDENTIAL (AZURE_SAS_TOKEN = '@azureAccountKey')
+)
+FILEFORMAT = CSV
+FORMAT_OPTIONS (
+   'header' = 'true',
+   'inferSchema' = 'true'
+);