Table of Contents

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  1. Preface
  2. Understanding Pipeline Partitioning
  3. Partition Points
  4. Partition Types
  5. Pushdown Optimization
  6. Pushdown Optimization and Transformations
  7. Real-time Processing
  8. Commit Points
  9. Row Error Logging
  10. Workflow Recovery
  11. Stopping and Aborting
  12. Concurrent Workflows
  13. Grid Processing
  14. Load Balancer
  15. Workflow Variables
  16. Parameters and Variables in Sessions
  17. Parameter Files
  18. FastExport
  19. External Loading
  20. FTP
  21. Session Caches
  22. Incremental Aggregation
  23. Session Log Interface
  24. Understanding Buffer Memory
  25. High Precision Data

Advanced Workflow Guide

Advanced Workflow Guide

Using Multiple Threads to Read a File Source

Using Multiple Threads to Read a File Source

When the Integration Service uses multiple threads to read a source file, it creates multiple concurrent connections to the source. The Integration Service may or may not read the rows in a file sequentially.
You can configure multi-threaded reading for direct or indirect file sources in a session:
  • Reading direct files.
    When the Integration Service reads a direct file, it creates multiple reader threads to read the file concurrently. You can configure the Integration Service to read from one or more direct files. For example, if a session reads from two files and you create five partitions, the Integration Service may distribute one file between two partitions and one file between three partitions.
  • Reading indirect files.
    When the Integration Service reads an indirect file, it creates multiple threads to read the file list concurrently. It also creates multiple threads to read the files in the list concurrently. The Integration Service may use more than one thread to read a single file.


Updated August 27, 2020