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I am encountering a recurring problem in my production environment using QuickFIX Python. The issue revolves around the corruption of session files (FIX.4.4-A-B.session) in the Sessions folder. The session file is expected to contain a valid date-time format (e.g., 20240108-11:42:01), but at random times, additional and seemingly random characters are appended(20231228-22:00:02§♥♥ 0qÄ@☼sS_½•LÕ☼s£↓› GLrµ©5¹vj↕Æ#¿ÈíÜ), leading to date-time conversion errors.

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This is a critical problem as it causes disruptions in the normal functioning of the system, and unfortunately, the error is being thrown from the underlying C++ codebase, making it challenging to catch and handle programmatically.

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  1. Are there known reasons or common scenarios that lead to such corruption in session files?
  2. How can I better handle or prevent such corruption in the session files within my Python code?
  3. Is there a recommended way to catch and handle errors originating from the C++ core of QuickFIX within the Python environment?

Versions:

  • Fix version - FIX44
  • I am using quickfix-ssl 1.15.1.post4
  • OS: Linux - ubuntu - 18.04

Any insights or suggestions would be greatly appreciated. Thank you!

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5
  • what is the system current character set settings? and timezone? Commented Jan 9, 2024 at 12:44
  • Wild guess: either the process is terminated at that time or multiple threads are concurrently modifying the file? Commented Jan 9, 2024 at 13:41
  • @Orenico - The system is configured with UTF-8 and operates in UTC timezone. Commented Jan 10, 2024 at 6:47
  • @ChristophJohn - I've thoroughly checked the system logs, and there is no indication of the process being terminated at the time of the issue. Commented Jan 10, 2024 at 6:48
  • It might be something with leapseconds...., otherwise I will carefully check the msgs sending party Commented Jan 11, 2024 at 9:26
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