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From Juan Carlos <juc...@gmail.com>
Subject Re: Question about DataNode
Date Thu, 27 Feb 2014 09:12:49 GMT
Hi Edward,
maybe you are sending your request to the master from the slave. I don't
are sure, but I think that secondary never answer any request, neither read
request, and you have to modify your config files by hand to change your
slave to be master.

I haven't tested so much with master/slave configurations, I only tested
with QJM and NFS syncronizations, in these cases whenever you start
namenodes they first get syncronized before being able to promote to active
namenode by checking journalnodes or NFS looking for changes in metadata to
update them.


2014-02-27 9:52 GMT+01:00 EdwardKing <zhangsc@neusoft.com>:

>  Two node,one is master,another is slave, I kill DataNode under slave,
> then create directory by dfs command under master machine:
> [hadoop@master]$./start-all.sh
>  [hadoop@slave]$ jps
> 9917 DataNode
> 10152 Jps
> [hadoop@slave]$ kill -9 9917
> [hadoop@master]$ hadoop dfs -mkdir test
> [hadoop@master]$ hadoop dfs -ls
> drwxr-xr-x   - hadoop supergroup          0 2014-02-27 00:15 test
> I guess test directory can't exist under slave,because slave is killed.
> Right?
> Then I restart service under master,like follows:
>  [hadoop@master]$./start-all.sh
>
> This time I find slave also contains test directory, why? Is hadoop2.2.0
> can automatic recovery?
> Any idea will be appreciated.
> Best regards,
> Edward
>
>
>
>
>
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