Hi, On Wed, Jul 31, 2013 at 7:03 AM, ch huang <justlo...@gmail.com> wrote: > hi,all : > i have two questions ,hope any one can answer for me > 1, if i use 2name nodes for HA ,the secondary name node still need?
With HA setup, you do not need to run the SecondaryNameNode daemon. > 2,the secondary name node use to merge fsimage and edits file,if secondary > name node is not needed for HA ,what if the name node edits file become very > long? The Standby state NameNode automatically behaves as a checkpoint service. Therefore, just ensure its liveliness and it will continue to checkpoint your cluster fine. -- Harsh J
