Error generating request statistics CSV in master–slave mode

[mjstrasser]

Describe the bug

After applying load in master–slave mode, generating request statistics causes an error.

A ValueError is raised by StatsEntry.get_current_response_time_percentile() when it is called by requests_csv(). This is a change introduced by commit 44c3fffd5434c04034acc467184ad073b68f140c.

The error is not raised when not in master–slave mode.

Expected behavior

A CSV should be generated (and downloaded in web mode).

Actual behavior

An error is raised and no CSV is generated. In web mode a blank page is shown with only the words Internal Server Error. Returning to the web interface resets any chart information.

Steps to reproduce

In web mode:

1. Start the master and slave processes.
2. Start a swarm in the web interface.
3. Go to the Download Data tab and click Download request statistics CSV.

In non-web mode.

1. Start the slave process.
2. Start the master process with the --csv option.

Environment settings

• OS: MacOS, Linux
• Python version: 3.7
• Locust version: 0.13.2

[mjstrasser]

This has been fixed, I think from #1197