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RE: Cluster lost IP addresses
After 2 hard restarts of all nodes, the cluster is back. But 7 of 18 nodes are dead. the NN is aware of all nodes, data (of non-dead) nodes is available.
We're pulling off data now, will give hardware back to the HW team next week.
*the emails in response to my original are very helpful in learning more about Hadoop concepts.many thanksJohn

Date: Sat, 23 Mar 2013 13:45:18 +0800
Subject: Re: Cluster lost IP addresses

oh,yes,it's not persist, only in memory. so there is no issue.
On Mar 23, 2013 1:13 PM, "Harsh J" <[EMAIL PROTECTED]> wrote:

NameNode does not persist block locations; so this is still

recoverable if the configs are changed to use the new set of hostnames

to bind to/look up.

On Sat, Mar 23, 2013 at 9:01 AM, Azuryy Yu <[EMAIL PROTECTED]> wrote:

> it has issues, namenode save blockid->nodes, using ip addr if your slaves

> config file using ip addr instead of hostname.


> On Mar 23, 2013 10:14 AM, "Balaji Narayanan (பாலாஜி நாராயணன்)"

> <[EMAIL PROTECTED]> wrote:


>> Assuming you are using hostnAmes and not ip address in your config files

>> What happens when you start the cluster? If you are using IP address in your

>> configs just update them and start. It should work with no issues.


>> On Friday, March 22, 2013, John Meza wrote:


>>> I have a 18 node cluster that had to be physically moved.

>>> Unfortunately all the ip addresses were lost (recreated).


>>> This must have happened to someone before.

>>> Nothing else on the machines has been changed. Most importantly the data

>>> in HDFS is still sitting there.


>>> Is there a way to recover this cluster to a useable state?

>>> thanks

>>> John




>> --

>> http://balajin.net/blog

>> http://flic.kr/balajijegan


Harsh J