Timing Problem in Multiparser

Oct 13, 2025 by vinooalluri.com 12 views

Introduction

In this article, we will delve into the issue of CTRL log data not being sent to Events/Metrics, a problem that has been observed to occur occasionally, particularly on MacOS. We will explore the possible causes of this issue, including a timing problem in the Multiparser, and provide steps to reproduce the behavior.

Description of Bug

The CTRL log data is not being sent to Events/Metrics, resulting in incomplete data being stored on the server. This issue appears to be related to a timing problem in the Multiparser, which is responsible for parsing the CTRL log CSV file and sending the data to the callback.

Steps To Reproduce

To reproduce this issue, follow these steps:

Step 1: Run MacOS Tests on CI

Run the MacOS tests on the Continuous Integration (CI) environment to trigger the issue.

Step 2: Look at Test_fds_ctrl_parser in the Logs

Check the logs for the test_fds_ctrl_parser test to see if the issue is occurring.

Expected Behavior

The expected behavior is that the final line from the CTRL log CSV file should be added as an Event and Metadata.

Actual Behavior

The actual behavior is that the Event and Metadata are not seen for the final CTRL event.

Possible Causes

Based on the analysis, the possible causes of this issue are:

Timing Problem in Multiparser: The Multiparser may be experiencing a timing issue, which is causing it to not send all the data added to the CSV file to the callback.
CSV Parser Issue: The CSV parser may be experiencing an issue, which is causing it to not read all the lines from the CSV file.

Screenshots

No screenshots are available to help explain this problem.

Setup

The setup for this issue is:

OS: MacOS
Simvue Integrations Version: v1.0.0
Simvue Python API Version: v2.0.0

Troubleshooting

To troubleshoot this issue, follow these steps:

Step 1: Add Print Statements

Add print statements inside the for loop in the CSV parser to see if all lines are being read.

Step 2: Add Print Statements in Callback

Add print statements in the callback to see if all lines are being parsed and sent.

Step 3: Check Logs

Check the logs for any errors or warnings that may indicate the cause of the issue.

Conclusion

In conclusion, the CTRL log data not being sent to Events/Metrics is a complex issue that requires a thorough analysis of the Multiparser and CSV parser. By adding print statements and checking the logs, we can identify the possible causes of this issue and take steps to resolve it.

Recommendations

Based on the analysis, the following recommendations are made:

Improve Multiparser: Improve the Multiparser to handle timing issues and ensure that all data added to the CSV file is sent to the callback.
Improve CSV Parser: Improve the CSV parser to handle issues and ensure that all lines are read from the CSV file.
Add Error Handling: Add error handling to the Multiparser and CSV parser to catch any errors that may occur and provide meaningful error messages.

Introduction

In our previous article, we explored the issue of CTRL log data not being sent to Events/Metrics, a problem that has been observed to occur occasionally, particularly on MacOS. We delved into the possible causes of this issue, including a timing problem in the Multiparser, and provided steps to reproduce the behavior. In this article, we will answer some frequently asked questions (FAQs) related to this issue.

Q: What is the Multiparser?

A: The Multiparser is a component responsible for parsing the CTRL log CSV file and sending the data to the callback.

Q: What is the CSV parser?

A: The CSV parser is a component responsible for reading the CTRL log CSV file and sending the data to the Multiparser.

Q: Why is the Multiparser experiencing a timing issue?

A: The Multiparser may be experiencing a timing issue due to the way it is designed to handle the data from the CSV file. This issue may be exacerbated by the fact that the CSV file is being written to simultaneously by multiple processes.

Q: How can I troubleshoot the issue?

A: To troubleshoot the issue, you can add print statements inside the for loop in the CSV parser to see if all lines are being read. You can also add print statements in the callback to see if all lines are being parsed and sent. Additionally, you can check the logs for any errors or warnings that may indicate the cause of the issue.

Q: What are the possible causes of this issue?

A: The possible causes of this issue are:

Timing Problem in Multiparser: The Multiparser may be experiencing a timing issue, which is causing it to not send all the data added to the CSV file to the callback.
CSV Parser Issue: The CSV parser may be experiencing an issue, which is causing it to not read all the lines from the CSV file.

Q: How can I improve the Multiparser?

A: To improve the Multiparser, you can:

Improve Multiparser Design: Improve the design of the Multiparser to handle timing issues and ensure that all data added to the CSV file is sent to the callback.
Add Error Handling: Add error handling to the Multiparser to catch any errors that may occur and provide meaningful error messages.

Q: How can I improve the CSV parser?

A: To improve the CSV parser, you can:

Improve CSV Parser Design: Improve the design of the CSV parser to handle issues and ensure that all lines are read from the CSV file.
Add Error Handling: Add error handling to the CSV parser to catch any errors that may occur and provide meaningful error messages.

Q: What are the recommendations for resolving this issue?

A: The recommendations for resolving this issue are:

Improve Multiparser: Improve the Multiparser to handle timing issues and ensure that all data added to the CSV file is sent to the callback.
Improve CSV Parser: Improve the CSV parser to handle issues and ensure that all lines are read from the CSV file.
Add Error Handling: Add error handling to the Multiparser and CSV parser to catch any errors that may occur and provide meaningful error messages.

Conclusion

In conclusion, the CTRL log data not being sent to Events/Metrics is a complex issue that requires a thorough analysis of the Multiparser and CSV parser. By understanding the possible causes of this issue and following the recommendations for resolving it, we can ensure that the data is complete and accurate.