We are using puppet, i would like to know the best process to do o.s updates on individual nodes? Can anyone suggest process?
Is it the same for name nodes also? IS there any special care has to be taken? Can you provide the hortonworks documentation link for patch updates?
you have seen this before. https://community.hortonworks.com/questions/4940/hdp-os-upgradepatching-best-practices.html. Same with namenodes, make sure you have HA. when you failover everything to standby node, take services down on the active (now standby) namenode and patch it.
Steps to update OS patches.
1) Stop all application on cluster
2) Apply the OS patches.
3) Reboot the system if required.
4) start all application on cluster
5) Validate all services.