File Iterator Overview
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Questions and Answers

What does the 'Stop On Condition' property do in Matillion ETL?

  • Specifies the value to be compared
  • Stops the iteration based on a specified condition (correct)
  • Continues the iteration based on a specified condition
  • Reverses the effect of the comparison

    • What method is used to create conditions in the Simple mode of Matillion ETL?

  • Writing conditions using SQL
  • Selecting from drop-down menus and text fields (correct)
  • Manually writing conditions in JavaScript
  • Using comparison operators like 'Less than' or 'Equal to'

    • What is the role of the 'Qualifier' in the Simple mode condition creation in Matillion ETL?

  • Reversing the effect of the comparison
  • Selecting the comparator
  • Specifying the value to be compared
  • Comparing the input variable to the value (correct)

    • In which mode of condition creation must users manually write the condition in JavaScript in Matillion ETL?

    <p>Advanced mode</p> Signup and view all the answers

    What does the 'Combine Conditions' property allow users to do in Matillion ETL?

    <p>Combine defined conditions using 'And' or 'Or'</p> Signup and view all the answers

    Which property makes values like 'Iteration Attempted' available for export in Matillion ETL?

    <p>Variable Exports</p> Signup and view all the answers

    'Not' in the Qualifier property does what to comparisons in Matillion ETL?

    <p>'Equals' becomes 'Not equals', 'Less than' becomes 'Greater than or equal to', etc.</p> Signup and view all the answers

    'Iterators terminate after failure' refers to what in Matillion ETL?

    <p>'Iteration Successful' is equal to max iteration number minus failures</p> Signup and view all the answers

    'Source Description Iteration Attempted' refers to what value in Matillion ETL?

    <p>'Iteration Attempted'</p> Signup and view all the answers

    Which statement accurately describes the File Iterator component?

    <p>It enables users to loop over matching files in a remote file system.</p> Signup and view all the answers

    How does the File Iterator component handle the execution of attached components?

    <p>It runs the attached component once for each file found.</p> Signup and view all the answers

    How are file names and path names mapped in the File Iterator component?

    <p>They are mapped into environment variables, which can then be referenced from the attached component(s).</p> Signup and view all the answers

    What is the recommended approach for iterating more than one component using the File Iterator?

    <p>Create a separate orchestration job or transformation job and use a Run Transformation or Run Orchestration component attached to the iterator.</p> Signup and view all the answers

    What is the maximum number of iterations allowed for all iterator components?

    <p>5000 iterations</p> Signup and view all the answers

    What is the purpose of the 'Name' property in the File Iterator component?

    <p>It is a human-readable name for the component.</p> Signup and view all the answers

    Which remote file system types are available for selection in the 'Input Data Type' property?

    <p>Azure Blob Storage, Cloud Storage, FTP, HDFS, S3, SFTP, and Windows Fileshare</p> Signup and view all the answers

    What is the purpose of the 'Input Data URL' property?

    <p>It provides the URL, including the full path and file name followed by a forward slash, that will point to the files to download to the selected staging area.</p> Signup and view all the answers

    What is the purpose of the Filter Regex property?

    <p>To define the folder structure and file pattern to search for</p> Signup and view all the answers

    What is the significance of the ${jv_folder}/.* expression in the Filter Regex?

    <p>It specifies to search for all files within a specific folder and its subfolders</p> Signup and view all the answers

    What is the purpose of the Recursive property?

    <p>To determine whether to search for files within subdirectories</p> Signup and view all the answers

    What is the purpose of the Variables property?

    <p>To define environment variables and file attributes to export for each matched file</p> Signup and view all the answers

    What is the purpose of the Break on Failure property?

    <p>To control whether to stop or continue iterations if a failure occurs</p> Signup and view all the answers

    What is the difference between the Concurrent and Sequential settings for the Concurrency property?

    <p>Concurrent runs iterations in parallel, while Sequential runs them one after the other</p> Signup and view all the answers

    What is the purpose of the Set Home Directory as Root property?

    <p>To define whether the URL path is relative to the server root or the user's home directory</p> Signup and view all the answers

    What is the purpose of the Max Recursion Depth property?

    <p>To specify the maximum depth to search for files in subdirectories</p> Signup and view all the answers

    What action will be taken if the 'Break on Failure' property is set to 'Yes'?

    <p>Fail immediately if the attached component doesn't run successfully.</p> Signup and view all the answers

    Which property in the File Iterator component allows users to specify whether to search for files within subdirectories or not?

    <p>Recursive</p> Signup and view all the answers

    What does the 'Concurrency' property in the File Iterator component determine?

    <p>How iterations run (concurrently or sequentially)</p> Signup and view all the answers

    When is the 'Ignore Hidden' property used in the File Iterator component?

    <p>To ignore 'hidden' files even if they match the filter regex</p> Signup and view all the answers

    What does the 'Filter Regex' property in the File Iterator component define?

    <p>The Java-standard regular expression used to test against file paths</p> Signup and view all the answers

    What does setting 'Max Recursion Depth' property to a value restrict in the File Iterator component?

    <p>The maximum recursion depth into subdirectories</p> Signup and view all the answers

    What is the significance of setting 'Set Home Directory as Root' to 'Yes'?

    <p>'Hidden' files are included.</p> Signup and view all the answers

    'Concurrent: Iterations run concurrently.' is associated with which property in the File Iterator component?

    <p>'Concurrency'</p> Signup and view all the answers

    'Sequential: Iterations run in sequence, waiting for each to complete before starting the next.' refers to which property in the File Iterator component?

    <p>'Concurrency'</p> Signup and view all the answers

    In Matillion ETL, what is the purpose of the 'Stop On Condition' property?

    <p>To terminate the iteration based on a specified condition.</p> Signup and view all the answers

    What does the 'Combine Conditions' property enable users to do in Matillion ETL?

    <p>Combine multiple conditions with logical operators.</p> Signup and view all the answers

    If a user selects the 'Advanced' mode for condition creation in Matillion ETL, what is the method of specifying conditions?

    <p>By manually writing conditions using JavaScript.</p> Signup and view all the answers

    What does the 'Qualifier' property in Simple mode condition creation allow users to do?

    <p>Reverse the effect of comparisons.</p> Signup and view all the answers

    What does the 'Iterators terminate after failure' statement refer to in Matillion ETL?

    <p>The number of successful iterations minus failures.</p> Signup and view all the answers

    When specifying conditions using Simple mode in Matillion ETL, what does selecting 'Not' as a Qualifier do?

    <p>Reverses the effect of the comparison operators.</p> Signup and view all the answers

    'Source Description Iteration Attempted' in Matillion ETL specifically refers to what value?

    <p>Number of iterations that have been initiated.</p> Signup and view all the answers

    'Combine Conditions' property is only available in Matillion ETL when which Mode is set?

    <p>'Simple'</p> Signup and view all the answers

    'Variable Exports' property in Matillion ETL allows for exporting which values into variables?

    <p>'Iteration Attempted' and 'Iteration Successful'</p> Signup and view all the answers

    Which property allows users to set the method of creating conditions as either 'Simple' or 'Advanced' in Matillion ETL?

    <p>'Mode'</p> Signup and view all the answers

    How does the File Iterator component handle the execution of attached components?

    <p>It runs the attached component once for each file found in the specified remote file system.</p> Signup and view all the answers

    How are file names and path names mapped in the File Iterator component?

    <p>They are mapped into environment variables that can be referenced from the attached component(s).</p> Signup and view all the answers

    What is the recommended approach for iterating more than one component using the File Iterator?

    <p>Put the components into a separate orchestration job or transformation job and use a Run Transformation or Run Orchestration component attached to the iterator.</p> Signup and view all the answers

    What is the purpose of the Input Data URL property?

    <p>It defines the URL, including the full path and file name followed by a forward slash, that will point to the files to download to the selected staging area.</p> Signup and view all the answers

    What is the maximum number of iterations allowed for all iterator components?

    <p>5000 iterations</p> Signup and view all the answers

    Which remote file system types are available for selection in the Input Data Type property?

    <p>Azure Blob Storage, Cloud Storage, FTP, HDFS, S3, SFTP, and Windows Fileshare</p> Signup and view all the answers

    What is the purpose of the Name property in the File Iterator component?

    <p>It sets a human-readable name for the component.</p> Signup and view all the answers

    What is the purpose of the Recursive property?

    <p>It determines whether the File Iterator should search for files in nested directories or only in the top-level directory specified by the Input Data URL.</p> Signup and view all the answers

    What is the significance of the ${jv_folder}/.* expression in the Filter Regex property?

    <p>It instructs the File Iterator to search for all files in the specified directory and its subdirectories.</p> Signup and view all the answers

    How does the Variables property impact the execution of the File Iterator component?

    <p>It allows users to define custom environment variables that can be referenced from the attached component(s).</p> Signup and view all the answers

    Study Notes

    File Iterator Component

    • The File Iterator component allows users to loop over matching files in a remote file system.
    • It searches for files in various remote file systems, running its attached component once for each file found.
    • Filenames and path names are mapped into environment variables, which can then be referenced from the attached component(s).

    Component Properties

    • Name: A human-readable name for the component.
    • Input Data Type: Select the remote file system to search, including Azure Blob Storage, Cloud Storage, FTP, HDFS, S3, SFTP, and Windows Fileshare.
    • Input Data URL: Input the URL, including the full path and file name followed by a forward slash, that will point to the files to download to the selected staging area.

    Iteration Properties

    • Record Values In Task History: Choose whether to record iteration values in the Matillion ETL Task History. Default setting is Yes.
    • Stop On Condition: Select Yes to stop the iteration based on a condition specified in the Condition property. Default setting is No.
    • Mode: Select the method of creating the condition, either Simple or Advanced.
    • Condition (Simple mode): Specify an Input Variable, Qualifier, Comparator, and Value using drop-down menus and text fields.
    • Condition (Advanced mode): Manually write the condition in the editor using JavaScript.
    • Combine Conditions: Use the defined conditions in combination with one another according to either And or Or.

    Variable Exports

    • Iteration Attempted: The number of iterations that this component attempts to reach (Max Iterations parameter).
    • Iteration Generated: The number of iterations that have been initiated.
    • Iteration Successful: The number of iterations successfully performed.

    Concurrency Properties

    • Concurrency: Select whether iterations run concurrently or sequentially. Default setting is Sequential.
    • Break on Failure: Select whether to attempt to run the attached component for each iteration, regardless of success or failure. Default setting is No.

    File Attributes

    • Variables: An existing environment variable to hold the given value of the Path Selection.
    • File Attribute: For each matched file, the target variable can be populated with the Base Path, the Subfolder, the Filename, or the date of when the file was Last Modified.

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    Description

    Learn the functionality of the File Iterator component which enables users to loop over matching files in a remote file system. Discover how filenames and path names are mapped into environment variables for easy referencing in attached components. Find out how to attach and detach the iterator to other components.

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