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From Daisuke Kobayashi <dais...@cloudera.com>
Subject Re: some questions about HA and secondary name node
Date Wed, 31 Jul 2013 02:18:13 GMT
Hi,

On Wed, Jul 31, 2013 at 10:33 AM, ch huang <justlooks@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?
>
No, you don't need to run a secondary NN if you configure HA.


> 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 NN also checkpoints the namespace state, and that's the reason
why it is not necessary to run a secondary NN.

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