Posts: 9
Registered: ‎03-02-2015

Planned Downtime for Datanode

Hi All,


I have a situation where we want to upgrade hardware of datanodes.

I know that I can decommission each of the machine and rejoin them.  


However, I was looking for ways to avoid replication of terabytes of data to another nodes as this is planned downtime.


I came across an option where I can increase heartbeat recheck interval (dfs.namenode.heartbeat.recheck-interval)  to delay the time namenode take to identify a dead datanode.

To use this option I am sure I need to restart namenode deamon.  


Is this the way cloudera recommends or is there any other ?


Thank you all in advance.