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tMapRDBInput properties for Apache Spark Batch

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

The Spark Batch tMapRDBInput component belongs to the Databases family.

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

Basic settings

Storage configuration

Select the tMapRDBConfiguration component from which the Spark system to be used reads the configuration information to connect to MapRDB.

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.

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.

 

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.

Table name

Type in the name of the table from which you need to extract columns.

Table Namespace mappings

Enter the string to be used to construct the mapping between an Apache HBase table and a MapR table.

For the valid syntax you can use, see http://doc.mapr.com/display/MapR40x/Mapping+Table+Namespace+Between+Apache+HBase+Tables+and+MapR+Tables.
Mapping

Complete this table to map the columns of the table to be used with the schema columns you have defined for the data flow to be processed.

Is by filter

Select this check box to use filters to perform fine-grained data selection from your database, such as selection of keys, or values, based on regular expressions.

Once selecting it, the Filter table that is used to define filtering conditions becomes available.

This feature leverages filters provided by HBase and subject to constraints explained in Apache HBase documentation. Therefore, advanced knowledge of HBase is required to make full use of these filters.

Logical operation
Select the operator you need to use to define the logical relation between filters. This available operators are:

  • And: every defined filtering conditions must be satisfied. It represents the relationship FilterList.Operator.MUST_PASS_ALL

  • Or: at least one of the defined filtering conditions must be satisfied. It represents the relationship: FilterList.Operator.MUST_PASS_ONE

Filter
Click the button under this table to add as many rows as required, each row representing a filter. The parameters you may need to set for a filter are:

  • Filter type: the drop-down list presents pre-existing filter types that are already defined by HBase. Select the type of the filter you need to use.

  • Filter column: enter the column qualifier on which you need to apply the active filter. This parameter becomes mandatory depending on the type of the filter and of the comparator you are using. For example, it is not used by the Row Filter type but is required by the Single Column Value Filter type.

  • Filter family: enter the column family on which you need to apply the active filter. This parameter becomes mandatory depending on the type of the filter and of the comparator you are using. For example, it is not used by the Row Filter type but is required by the Single Column Value Filter type.

  • Filter operation: select from the drop-down list the operation to be used for the active filter.

  • Filter Value: enter the value on which you want to use the operator selected from the Filter operation drop-down list.

  • Filter comparator type: select the type of the comparator to be combined with the filter you are using.

Depending on the Filter type you are using, some or each of the parameters become mandatory. For further information, see HBase filters

Die on HBase error

Select the check box to stop the execution of the Job when an error occurs.

Clear the check box to skip any rows on error and complete the process for error-free rows. When errors are skipped, you can collect the rows on error using a Row > Reject link.

Usage

Usage rule

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

This component uses a tMapRDBConfiguration component present in the same Job to connect to MapR-DB.

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 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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