Can't aggregate babar.log to yarn logs

[andres-lago]

Hello,
I can't get the babar.log aggregated to yarn logs. When I run the command to get the logs:
yarn logs --applicationId application_XXXX_YYYY > myAppLog.log

the resulting myAppLog.log doesn't contain the traces of babar.log. It contains only my application and yarn log messages.

It is not a problem when I launch the application from the linux command line (calling directly spark2-submit) because the file babar.log is created in the same directory. But when I launch it from an oozie workflow (production environment), the file babar.log dissapears when the container terminates and its content is not aggregated.

I realized that the system properties: yarn.app.container.log.dir and spark.yarn.app.container.log.dir are null, then babar uses a local directory where log is stored : ./log. Could it be the reason? Anyone has observed the same problem?

[BenoitHanotte]

Hello!
Yes it could be the problem, the agent uses the environment properties to find where to store the log file. It the properties are not found, it will store to a local folder named log.
If you tried to replace the environemnt property by getting the value from an initialized hadoop configuration, would you get a correctly set value?
Something like:

Configuration conf = new Configuration();
conf.get("yarn.app.container.log.dir")

You could also try to specify a custom log directory from the agent parameters that you add to your java options.

[andres-lago]

Hi Benoit,
thanks for your support. We've chosen the easiest solution, write the babar.log to a local directory outside the container (/tmp) and collect it afterwards manually from the concerned server (driver's server in our case). I couldn't find an easy solution to get the property value (directory of yarn containers' logs) and pass it to babar before launching spark2-submit from an oozie workflow.

We activated babar only for the driver, we didn't arrive to launch it in the executors. But as we're actually working in a problem with the driver, then it's enough by now.