On Dec 16, 2010, at 6:34 AM, Erik Forsberg <forsb...@opera.com> wrote:
> Hi! > > I have unbalanced disks on one of my nodes after a disk failure with > disk replacements. > > http://wiki.apache.org/hadoop/FAQ#On_an_individual_data_node.2C_how_do_you_balance_the_blocks_on_the_disk.3F > has a solution, but it starts with "Take down HDFS". > > Is that really necessary - shouldn't taking down just that datanode, > moving around the blocks, then start the datanode be good enough, or > will that mess up some datastructure in the namenode? > You're right - that should say take the DataNode down, move blocks around, then restart the DataNode. You might be able to just replace the disk and have them unbalanced for a while though. As data is created and deleted things will naturally even out. --Travis > Thanks, > \EF > -- > Erik Forsberg <forsb...@opera.com> > Developer, Opera Software - http://www.opera.com/
