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From Bill Au <bill.w...@gmail.com>
Subject Re: adding replication status to dfshealth.jsp
Date Wed, 11 Feb 2009 17:18:21 GMT
Thanks for the info.  What version(s) is "-metaSave" available for?  I am
running 0.18.2 and it doesn't work there.


On Tue, Feb 10, 2009 at 9:04 PM, Raghu Angadi <rangadi@yahoo-inc.com> wrote:

> one more thing I forgot :
> Another useful tool is 'bin/hadoop dfsadmin -metaSave'
> This lists all the blocks that are under replicated. This is not very
> official and not used much. It needs to be more user friendly (currently it
> writes to a file on the NameNode)... I might improve (and/or rename) it as a
> follow up to HADOOP-4103.
> Stats like dfs.FSNamesystem.UnderReplicatedBlocks that Brain mentioned are
> useful to find if there is some problem. And the commands like the one above
> help in finding which specific blocks are in these states.
> Raghu.
> Bill Au wrote:
>> I am in the process of setting up remote monitoring of my Hadoop cluster.
>>  I
>> seems to me that the replication status can only be obtained from the
>> command line by the fsck command.  Has anyone though about adding
>> replication status to the NameNode web UI in dfshealth.jsp?  Or is that
>> something that I really shouldn't worry about since Hadoop will fix things
>> all by itself?
>> Bill

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