By "scrub" do you mean delete the blocks from the node? Read your conf/hadoop-site.xml file to determine where dfs.data.dir points, then for each directory in that list, just rm the directory. If you want to ensure that your data is preserved with appropriate replication levels on the rest of your clutser, you should use Hadoop's DataNode Decommission feature to up-replicate the data before you blow a copy away.
- Aaron On Wed, Jan 28, 2009 at 2:10 PM, Sriram Rao <srirams...@gmail.com> wrote: > Hi, > > Is there a tool that one could run on a datanode to scrub all the > blocks on that node? > > Sriram >
