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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

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Message Recovery

Message Recovery

When you recover a real-time session, the Integration Service uses the message ID and the commit number in the recovery table to determine whether it committed messages to all targets.
The Integration Service commits messages to all targets if the message ID exists in the recovery table and all targets have the same commit number. During recovery, the Integration Service sends an acknowledgement to the source that it processed the message.
The Integration Service does not commit messages to all targets if the targets have different commit numbers. During recovery, the Integration Service reads the message IDs and the transformation state from the recovery table. It processes messages and writes them to the targets that did not have the message. When the Integration Service reads all messages from the recovery table, it ends the session.
If the session fails before the Integration Service commits messages to all targets and you restart the session in cold start mode, targets can receive duplicate rows.