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File Truncate Correctness Test

This test verifies that the read position of a file is reset in the event of truncation. Failing to do so typically results loss of any new data written to the file.

Design

  1. Each subject is configured to tail a test log file and send it to a downstream service.
  2. The subject is started.
  3. The test log file is truncated.
  4. A unique new line is added to the test log file.
  5. Assert that the downstream service received the unique new line.

Results

Subject Result
Filebeat ✅
FluentBit ✅
FluentD ✅
Logstash ✅
Splunk HF ✅
Splunk UF ✅
Vector ✅

Try it

You can run this test via:

test -t file_truncate_correctness

Resources