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tSnowflakeInput properties for Apache Spark Batch (technical preview)

Availability-notepreview

These properties are used to configure tSnowflakeInput running in the Spark Batch Job framework.

The Spark Batch tSnowflakeInput component belongs to the Databases family.

The component in this framework is available in all Talend products with Big Data and Talend Data Fabric.

Basic settings

Use an existing configuration

Select this check box and in the Component List drop-down list, select the desired connection component to reuse the connection details you already defined.

Account

In the Account field, enter, in double quotation marks, the account name that has been assigned to you by Snowflake.
Region

Select an AWS or Azure region from the drop-down list.
Authentication method

Set the authentication method.

  • Key Pair: Select this option if key pair authentication is enabled. For more information about key pair authentication, see Using Key Pair Authentication.
Information noteNote: Before selecting the Key Pair option, make sure you have set the key pair authentication data in the Basic settings view of the tSetKeystore component as follows.
  • Leave the TrustStore type field unchanged;
  • Set TrustStore file to "";
  • Clear the TrustStore password field;
  • Select Need Client authentication;
  • Enter the path to the key store file in double quotation marks in the KeyStore file field (or click the […] button to the right of the KeyStore file field and navigate to the key store file);
  • Enter the key store file password in the KeyStore password field;
  • Clear the Check server identity option.
Information noteNote: The Key Pair option is available only with the EMR 5.29 and CDH 6.1 distributions when you are using Spark v2.4 and onwards in the Local Spark mode.

Username and Password

Enter, in double quotation marks, your authentication information to log in to Snowflake.

  • In the User ID field, enter, in double quotation marks, your login name that has been defined in Snowflake using the LOGIN_NAME parameter of Snowflake. For details, ask the administrator of your Snowflake system.

  • To enter the password, click the [...] button next to the password field, and then in the pop-up dialog box enter the password between double quotes and click OK to save the settings.

Database

Enter, in double quotation marks, the name of the Snowflake database to be used. This name is case-sensitive and is normally upper case in Snowflake.

Warehouse

Enter, in double quotation marks, the name of the Snowflake warehouse to be used. This name is case-sensitive and is normally upper case in Snowflake.

Schema and Edit Schema

A schema is a row description. It defines the number of fields (columns) to be processed and passed on to the next component. When you create a Spark Job, avoid the reserved word line when naming the fields.

Built-In: You create and store the schema locally for this component only.

Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs.

If the Snowflake data type to be handled is VARIANT, OBJECT or ARRAY, while defining the schema in the component, select String for the corresponding data in the Type column of the schema editor wizard.

Click Edit schema to make changes to the schema. If the current schema is of the Repository type, three options are available:

  • View schema: choose this option to view the schema only.

  • Change to built-in property: choose this option to change the schema to Built-in for local changes.

  • Update repository connection: choose this option to change the schema stored in the repository and decide whether to propagate the changes to all the Jobs upon completion. If you just want to propagate the changes to the current Job, you can select No upon completion and choose this schema metadata again in the Repository Content window.

Note that if the input value of any non-nullable primitive field is null, the row of data including that field will be rejected.

This component offers the advantage of the dynamic schema feature. This allows you to retrieve unknown columns from source files or to copy batches of columns from a source without mapping each column individually. For further information about dynamic schemas, see Talend Studio User Guide.

This dynamic schema feature is designed for the purpose of retrieving unknown columns of a table and is recommended to be used for this purpose only; it is not recommended for the use of creating tables.
Table Name Enter, within double quotation marks, the name of the Snowflake table to be used. This name is case-sensitive and is normally upper case in Snowflake.
Read from Select either Table or Query from the dropdown list.
Connection properties

Enter, in double quotation marks, a connection property and the associated value in the corresponding columns. You can find the properties available in Setting Configuration Options for the Connector from the official Snowflake documentation.

Advanced settings

Allow Snowflake to convert columns and tables to uppercase

Select this check box to convert lowercase in the defined table name and schema column names to uppercase. Note that unquoted identifiers should match the Snowflake Identifier Syntax.

If you deselect the check box, all identifiers are automatically quoted.

This property is not available when you select the Manual Query check box.

For more information on the Snowflake Identifier Syntax, see Identifier Syntax.
Use Custom Region Select this check box to use the customized Snowflake region.
Custom Region Enter, within double quotation marks, the name of the region to be used. This name is case-sensitive and is normally upper case in Snowflake.
Trim all the String/Char columns

Select this check box to remove leading and trailing whitespace from all the String/Char columns.
Trim column Remove the leading and trailing whitespace from the defined columns.

Usage

Usage rule

This component is used as a start component and requires an output link.

Use a tSnowFlakeConfiguration: update component in the same Job to connect to Snowflake.

Spark Connection

In the Spark Configuration tab in the Run view, define the connection to a given Spark cluster for the whole Job. In addition, since the Job expects its dependent jar files for execution, you must specify the directory in the file system to which these jar files are transferred so that Spark can access these files:
  • Yarn mode (Yarn client or Yarn cluster):

    • When using Google Dataproc, specify a bucket in the Google Storage staging bucket field in the Spark configuration tab.

    • When using HDInsight, specify the blob to be used for Job deployment in the Windows Azure Storage configuration area in the Spark configuration tab.

    • When using Altus, specify the S3 bucket or the Azure Data Lake Storage for Job deployment in the Spark configuration tab.
    • When using Qubole, add a tS3Configuration to your Job to write your actual business data in the S3 system with Qubole. Without tS3Configuration, this business data is written in the Qubole HDFS system and destroyed once you shut down your cluster.

    • When using on-premises distributions, use the configuration component corresponding to the file system your cluster is using. Typically, this system is HDFS and so use tHDFSConfiguration.

  • Standalone mode: use the configuration component corresponding to the file system your cluster is using, such as tHDFSConfiguration Apache Spark Batch or tS3Configuration Apache Spark Batch.

    If you are using Databricks without any configuration component present in your Job, your business data is written directly in DBFS (Databricks Filesystem).

This connection is effective on a per-Job basis.

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