Table of Contents

  1. Preface
  2. Introduction to Informatica Edge Data Streaming
  3. Licenses
  4. Using Informatica Administrator
  5. Creating and Managing the Edge Data Streaming Service
  6. Edge Data Streaming Entity Types
  7. Edge Data Streaming Nodes
  8. Data Connections
  9. Working With Data Flows
  10. Managing the Edge Data Streaming Components
  11. Security
  12. High Availability
  13. Disaster Recovery
  14. Monitoring Edge Data Streaming Entities
  15. Troubleshooting
  16. Frequently Asked Questions
  17. Regular Expressions
  18. Command Line Program
  19. Configuring Edge Data Streaming to Work With a ZooKeeper Observer
  20. Glossary

User Guide

User Guide

Target File Rollover

When you write to an HDFS target, you can perform the following types of rollover:
Size-based rollover
You can configure an HDFS target service to perform target file rollover when the target file reaches a certain size. To configure size-based rollover, specify the Rollover Size property of the target service.
Time-based rollover
You can configure an HDFS target service to perform target file rollover when a certain period of time has elapsed after the target service creates the target file. To configure time-based rollover, specify the Rollover Time property of the target service.
You can implement both rollover schemes for a target file, in which case, the event that occurs first triggers a rollover. For example, if you set rollover time to 1 hour and rollover size to 1 GB, the target service rolls the file over when the file reaches a size of 1 GB even if the 1-hour period has not elapsed.
The target file to which the target service is writing data is the active file. Files that the target service closes after performing a rollover are archived files. When the target service archives a file, it appends the timestamp to the file name. For example, set the rollover size as 1 MB and name of the file target as target.log. If the source service sends 5 MB to the file target, the file target first creates the target.log.<timestamp> file. When the size of target.log.<timestamp> reaches 1 MB, the target service rolls the file over.


Updated March 19, 2019


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