Error messages on a clean install—error app log messages

[gdiazlo]

Describe the solution you'd like

After installing the Wazuh UI, the application shows some errors. We need to avoid the generation of these errors, as it leads the user to think the application might have a problem when there is none.

We need to examine the errors shown in the different platforms we support and devise solutions to make the first start more robust.

Error in a clean install in the error app log message page:

Related issues:

• Error messages on a clean install: Error in journalctl output #4209

[Desvelao]

Research

I was researching the problem, and this could be related to the statistics jobs done by the plugin's backend to index data related to the manager or cluster (depending on if cluster is disabled or not).

Checking the plugin logs, I got:

error: 2022/06/06 8:46:0: cron-scheduler|SaveDocument: resource_already_exists_exception

The log is coming from https://github.com/wazuh/wazuh-kibana-app/blob/c700a23da7054dc8be889199c8c81a6405e39ea3/server/start/cron-scheduler/save-document.ts#L66

The error is caused when trying to create an index that already exists. This error is logged by the plugin.

The statistics plugin job defines 4 jobs:

• 2 for manager mode
• 2 for cluster mode

Each job checks the existence of the index before indexing data, and if it doesn't exist, they attempt to create it. These jobs run in parallel and periodically, so there is a race condition here, as when the second job reaches this section of the code, the previous one has already created the index, logging the resource_already_exists_exception message.

Proposed solution

This behavior does not represent an error condition, but a race condition that has no harmful consequences. The most efficient solution would be to solve this race condition using any of the mutual exclusion techniques, but as we won't redesign the jobs for now, the proposed solution is to check the nature of the error and, if it is due to this race condition, then don't log any error, as this behavior is expected due to the current design.

https://github.com/wazuh/wazuh-kibana-app/blob/c700a23da7054dc8be889199c8c81a6405e39ea3/server/start/cron-scheduler/save-document.ts#L45-L69

[Desvelao]

Solved in #4235.