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From Raghu Angadi <rang...@yahoo-inc.com>
Subject Re: adding replication status to dfshealth.jsp
Date Wed, 11 Feb 2009 01:41:39 GMT

https://issues.apache.org/jira/browse/HADOOP-4103 will provide warnings 
in near real-time about blocks with zero good replicas (without adding 
any overhead). We can of course add on to it later to list up to 1000 of 
under-replicated blocks for e.g.

The current (or at least till 0.20) dfshealth.jsp is pretty bad on NN 
CPU since iterates over *all* the blocks (without holding the lock). It 
takes many seconds to load the page if you say 70M blocks. There are 
many problems with it.. the feature you are asking increases the 
dependence on that. To do this feature properly we need to essentially 
do fsck ...


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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