Thank you, Raghu. I'm using 0.16.3, so I should be safe. :) Otis -- Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch
----- Original Message ---- > From: Raghu Angadi <[EMAIL PROTECTED]> > To: core-user@hadoop.apache.org > Sent: Thursday, May 8, 2008 9:10:33 PM > Subject: Re: Changing DN hostnames->IPs > > Short answer : renaming is not problem. > > If you are running fairly recent Hadoop, NN does not store information > about the DataNode persistently. So you should be ok in the sense > NameNode does not depend on datanodes before the restart. > > If you are running fairly old Hadoop, functionally it will ok. Only > annoying thing would be that you might see all the previous datanodes > listed as dead. > > The recent trunk has some issues related using Datanode ID for some > unclosed files.. but you may not be affected by that. > > Raghu. > > Otis Gospodnetic wrote: > > Hi, > > > > Will NN get confused if I change the names of slaves from hostnames to IPs? > > That is, if I've been running Hadoop for a while, and then decide to shut > > down > all its daemons, switch to IPs, and start everything back up, will the > master/NN > still see all the DN slaves as before and will it know they are the same old > set > of DN slaves? > > > > Thanks, > > Otis > > -- > > Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch > >
