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From "Segel, Mike" <mse...@navteq.com>
Subject RE: decommission a rack
Date Wed, 05 Jan 2011 15:01:47 GMT
Change your topology script?

One thing about rack awareness. You never want to have an unbalanced configuration. The caveat
is if your uplinks between the ToR Switch  are 'fat' enough. (4 10GBe should do it.)

If you watched your system with the one machine on a separate rack (assuming it was also on
a separate switch) you'd see a major network bottle neck. (We use Ganglia)

If you're seeing the rack count wrong, you could just bounce the cloud and it should show
only two.

Note: Deprecating a machine can take a long time. You may want to consider just killing the
node, waiting till the cluster recognizes that its down and I believe just kicking off an
FSCK or maybe running the balancer program will clean that up faster than deprecating. (YMMV)



-----Original Message-----
From: Mag Gam [mailto:magawake@gmail.com] 
Sent: Wednesday, January 05, 2011 5:56 AM
To: general@hadoop.apache.org
Subject: decommission a rack

Using 0.21

I have a server which was in rack3. It was the only server in this
rack so I decommissioned the server. fsck shows only 2 racks however
topology shows 3 racks. How can I fix this?

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