Updating the log level from the Storm CLI

We can modify the log level from the Storm CLI. The following is the command that the user has to execute from the Storm directory to update the log settings on the runtime:

bin/storm set_log_level [topology name] -l [logger name]=[LEVEL]:[TIMEOUT] 

In the preceding code, topology name is the name of the topology, and logger name is the logger we want to change. If you want to change the ROOT logger, then use ROOT as a value of logger name. The LEVEL is the log level you want to apply. The possible values are DEBUG, INFO, ERROR, TRACE, ALL, WARN, FATAL, and OFF.

The TIMEOUT is the time in seconds. The log level will go back to normal after the timeout time. The value of TIMEOUT is mandatory if you are setting the log level to DEBUG/ALL.

The following is the command to change the log level setting for the storm_example topology:

$> bin/storm set_log_level storm_example -l ROOT=DEBUG:30  

The following is the command to clear the log level setting:

$> ./bin/storm set_log_level storm_example -r ROOT