Step 설명
This step provides the ability to read data from a delimited file. It has fewer overall options than the general Text File Input step, but it has a few key features over it:
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이 Step은 구분자로 필드가 구분된 파일에서 데이터를 읽습니다. Text File Input step보다 전체적인 기능은 적지만 몇가지 특별한 기능을 가지고 있습니다:
- NIO -- 파일을 읽을 때 네이티브 시스템 콜을 사용하여 성능이 뛰어납니다 그너아 현재는 로컬 파일만 읽을 수 있고, VFS는 지원하지 않습니다.
- Parallel running -- If you configure this step to run in multiple copies or in clustered mode, and you enable parallel running, each copy will read a separate block of a single file allowing you to distribute the file reading to several threads or even several slave nodes in a clustered transformation.
- Lazy conversion -- If you will be reading many fields from the file and many of those fields will not be manipulate, but merely passed through the transformation to land in some other text file or a database, lazy conversion can prevent Kettle from performing unnecessary work on those fields such as converting them into objects such as strings, dates, or numbers.
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