For 1.0, the right property is "mapred.reduce.child.java.opts". The "mapreduce.*" style would apply to MR in 2.0 and above.
On Mon, Apr 2, 2012 at 3:00 PM, Juan Pino <juancitomiguel...@gmail.com> wrote: > Hello, > > I have a job that requires a bit more memory than the default for the > reducer (not for the mapper). > So for this I have this property in my configuration file: > > mapreduce.reduce.java.opts=-Xmx4000m > > When I run the job, I can see its configuration in the web interface and I > see that indeed I have mapreduce.reduce.java.opts set to -Xmx4000m > but I also have mapred.child.java.opts set to -Xmx200m and when I ps -ef > the java process, it is using -Xmx200m. > > So to make my job work I had to set mapred.child.java.opts=-Xmx4000m in my > configuration file. > However I don't need that much memory for the mapper. > How can I set more memory only for the mapper ? Is the only solution to set > mapred.child.java.opts to -Xmx4000m, mapreduce.reduce.java.opts to -Xmx4000m > and mapreduce.map.java.opts to -Xmx200m ? > > I am using hadoop 1.0.1. > > Thank you very much, > > Juan -- Harsh J
