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From "ccxixicc" <ccxix...@foxmail.com>
Subject Re: What if one of the directory(dfs.name.dir) rw error ?
Date Wed, 25 May 2011 08:07:00 GMT
I'm using 0.20.2. 

I had some test. I dont know how to simulate a disk failure, just chmod 000 dir1, the namenode
shutdown immediately. And NN will hang if the nfs server down.


 
 
------------------ Original ------------------
From:  "Harsh J"<harsh@cloudera.com>;
Date:  Wed, May 25, 2011 03:49 PM
To:  "hdfs-user"<hdfs-user@hadoop.apache.org>; 
Subject:  Re: What if one of the directory(dfs.name.dir) rw error ?

 
 Yes. But depending on the version you're using, you may have to
manually restart the NN after fixing the mount points, to get the
directories in action again.

2011/5/25 ccxixicc <ccxixicc@foxmail.com>:
>
> Hi,all
> I set dfs.name.dir to a comma-delimited list of directories, dir1 is in
> /dev/sdb1 dir2 is in /dev/sdb2 and dir3 is nfs derectory.
> What happens if /dev/sdb1 disk error, so dir1 cannot be read and write?
> What happens if nfs server down, so dir3 cannot be read and write?
> Will hadoop ignore the bad directory and use the good directory and continue
> server?
> Thanks.
>



-- 
Harsh J
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