which distribution are you using? Regards, *Stanley Shi,*
On Thu, Jul 24, 2014 at 4:38 AM, andrew touchet <adt...@latech.edu> wrote: > I should have added this in my first email but I do get an error in the > data node's log file > > '2014-07-12 19:39:58,027 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: BlockReport of 0 blocks > got processed in 1 msecs' > > > > On Wed, Jul 23, 2014 at 3:18 PM, andrew touchet <adt...@latech.edu> wrote: > >> Hello, >> >> I am Decommissioning data nodes for an OS upgrade on a HPC cluster . >> Currently, users can run jobs that use data stored on /hdfs. They are able >> to access all datanodes/compute nodes except the one being decommissioned. >> >> Is this safe to do? Will edited files affect the decommissioning node? >> >> I've been adding the nodes to /usr/lib/hadoop-0.20/conf/hosts_exclude and >> running 'hadoop dfsadmin -refreshNodes' on the name name node. Then I >> simply wait for log files to report completion. After upgrade, I simply >> remove the node from hosts_exlude and start hadoop again on the datanode. >> >> Also: Under the namenode web interface I just noticed that the node I >> have decommissioned previously now has 0 Configured capacity, Used, >> Remaining memory and is now 100% Used. >> >> I used the same /etc/sysconfig/hadoop file from before the upgrade, >> removed the node from hosts_exclude, and ran '-refreshNodes' afterwards. >> >> What steps have I missed in the decommissioning process or while bringing >> the data node back online? >> >> >> >> >
