hadoop.tmp.dir is a directory created on local file system For example if you have set hadoop.tmp.dir property to /home/training/hadoop
This directory will be created when you format the namenode by running the command hadoop namenode -format When you open this folder you will see two subfolders dfs and mapred. the /home/training/hadoop/mapred folder will be on HDFS also Hope this clears Regards, Som Shekhar Sharma +91-8197243810 On Mon, Dec 16, 2013 at 1:42 PM, Dieter De Witte <drdwi...@gmail.com> wrote: > Hi, > > Make sure to also set mapred.local.dir to the same set of output > directories, this is were the intermediate key-value pairs are stored! > > Regards, Dieter > > > 2013/12/16 Tao Xiao <xiaotao.cs....@gmail.com> >> >> I have ten disks per node,and I don't know what value I should set to >> "hadoop.tmp.dir". Some said this property refers to a location in local disk >> while some other said it refers to a directory in HDFS. I'm confused, who >> can explain it ? >> >> I want to spread I/O since I have ten disks per node, so should I set a >> comma-separated list of directories (which are on different disks) to >> "hadoop.tmp.dir" ? > >
