Thanks Nitin. What I need is to set slot only for a specific job, not for the whole cluster conf. But what I did does NOT work ... Have I done something wrong?
2013/4/30 Nitin Pawar <nitinpawar...@gmail.com> > The config you are setting is for job only > > But if you want to reduce the slota on tasktrackers then you will need to > edit tasktracker conf and restart tasktracker > On Apr 30, 2013 3:30 PM, "Han JU" <ju.han.fe...@gmail.com> wrote: > >> Hi, >> >> I want to change the cluster's capacity of reduce slots on a per job >> basis. Originally I have 8 reduce slots for a tasktracker. >> I did: >> >> conf.set("mapred.tasktracker.reduce.tasks.maximum", "4"); >> ... >> Job job = new Job(conf, ...) >> >> >> And in the web UI I can see that for this job, the max reduce tasks is >> exactly at 4, like I set. However hadoop still launches 8 reducer per >> datanode ... why is this? >> >> How could I achieve this? >> -- >> *JU Han* >> >> Software Engineer Intern @ KXEN Inc. >> UTC - Université de Technologie de Compiègne >> * **GI06 - Fouille de Données et Décisionnel* >> >> +33 0619608888 >> > -- *JU Han* Software Engineer Intern @ KXEN Inc. UTC - Université de Technologie de Compiègne * **GI06 - Fouille de Données et Décisionnel* +33 0619608888