The YB-Master service maintains the system metadata and records, including tables and the locations of their tablets, as well as users and roles with their associated permissions.
The YB-Master service is also responsible for coordinating background operations, such as load-balancing and initiating replication for under-replicated data. Additionally, it handles various administrative tasks, including creating, altering, and dropping tables.
INFO, WARN, ERROR and FATAL. The log level is defined by the –minloglevel gFlag which can be set to one of the following values: 0 (INFO), 1 (WARN), 2 (ERROR), 3 (FATAL), where 0 (INFO) is the default.
The YB-Master processes are very chatty and log ALOT of INFO messages. If you are only intertesed in non-INFO messages, you can turn them off.
Example:
[root@Cloud_Server_0 ~]# yugabyted start | grep log
| Log Dir : /root/var/logs |
[root@Cloud_Server_0 ~]# grep "^I" /root/var/logs/master/yb-master.INFO | wc -l
984
Wow, there were 984 INFO entries added to the YB-Master log immediately after a start!
Now let’s see how many lines are written to the INFO log if we change the minimum log level to 1 (WARN).
Stopped yugabyted using config /root/var/conf/yugabyted.conf.
Deleted logs at /root/var/logs.
Deleted data at /root/var/data.
Deleted conf at /root/var/conf.
[root@Cloud_Server_0 ~]# yugabyted start --master_flags="minloglevel=1" | grep log
| Log Dir : /root/var/logs |
[root@Cloud_Server_0 ~]# grep "^I" /root/var/logs/master/yb-master.INFO | wc -l
0
INFO lines were written to Master INFO log! Have Fun!
