If you will change the default scheduler take a look at the thread "Dynamic changing of slaves" on the mailing list where I described my understanding of the scheduling process. However if you will modify some fairscheduling code, take a look at classes fairscheduler.java and schedulingalgorithms.java from the fairscheduler package. Here you can make your own comparator that can compare jobs/pools depending on varying parameters or you can make your own method for job/pool share calculation. If I am not wrong there is another option just to extend a class xy (do not know which) and set jobs weights (check the docs from Harsh)
On 7 March 2012 01:08, Ranjan Banerjee <rbanerj...@wisc.edu> wrote: > Hello Harsh, > Thanks for the quick info. I will go through the specifics. I hope you > will address any further doubts that I have on the issue. > > Regards, > Ranjan > > On 03/06/12, Harsh J wrote: > > Ranjan, > > > > Schedulers do not apply per-job. You need to change it at the JobTracker. > > > > Follow instructions at > > http://hadoop.apache.org/common/docs/r1.0.0/fair_scheduler.html to > > switch scheduler to FairScheduler. > > > > On Wed, Mar 7, 2012 at 4:08 AM, Ranjan Banerjee <rbanerj...@wisc.edu> > wrote: > > > > > > Hello, > > > I am relatively new to Hadoop. Started playing with it around two > weeks ago. I have finished running the canonical word count map reduce > example. My class project involves coming with a different scheduler for > Hadoop. I know that by default Hadoop uses the FIFO and it also has the > fair scheduler to be used. Can someone suggest where do I exactly write my > scheduler code and what change do I need to do to the Conf object so that > my scheduler is used by Hadoop and not the default scheduler in scheduling > map reduce jobs. > > > > > > Regards, > > > Ranjan > > > > > > > > > > > > > > > On 03/02/12, mohammed elsaeedy wrote: > > >> Dear Mailing list, > > >> > > >> I've been trying to simply build the hadoop source code on my > Macbook > > >> Pro. I tried following the tutorial mentioned > > >> here<http://wiki.apache.org/hadoop/EclipseEnvironment>. > > >> I grabbed the source code from github, and then I try to run maven: > > >> > > >> mvn install -DskipTests > > >> > > >> mvn clean package -DskipTests -Pdist -Dtar -Dmaven.javadoc.skip=true > > >> > > >> > > >> but I always get the following error: > > >> > > >> *[INFO] > > >> > ------------------------------------------------------------------------* > > >> *[INFO] Total time: 14:48.283s* > > >> *[INFO] Finished at: Fri Mar 02 13:29:20 EET 2012* > > >> *[INFO] Final Memory: 68M/123M* > > >> *[INFO] > > >> > ------------------------------------------------------------------------* > > >> *[ERROR] Failed to execute goal > > >> org.apache.maven.plugins:maven-pdf-plugin:1.1:pdf (pdf) on project > > >> hadoop-distcp: Error during document generation: Error parsing > > >> > /Users/SaSa/Desktop/Hadoop/src/hadoop-common/hadoop-tools/hadoop-distcp/target/pdf/site.tmp/xdoc/index.xml: > > >> Error validating the model: Fatal error:* > > >> *[ERROR] Public ID: null* > > >> *[ERROR] System ID: http://maven.apache.org/xsd/xdoc-2.0.xsd* > > >> *[ERROR] Line number: 2699* > > >> *[ERROR] Column number: 5* > > >> *[ERROR] Message: The element type "xs:element" must be terminated by > the > > >> matching end-tag "</xs:element>".* > > >> *[ERROR] -> [Help 1]* > > >> *[ERROR] * > > >> *[ERROR] To see the full stack trace of the errors, re-run Maven with > the > > >> -e switch.* > > >> *[ERROR] Re-run Maven using the -X switch to enable full debug > logging.* > > >> *[ERROR] * > > >> *[ERROR] For more information about the errors and possible solutions, > > >> please read the following articles:* > > >> *[ERROR] [Help 1] > > >> > http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException* > > >> *[ERROR] * > > >> *[ERROR] After correcting the problems, you can resume the build with > the > > >> command* > > >> *[ERROR] mvn <goals> -rf :hadoop-distcp* > > >> > > >> I googled for a similar problem, all I got was some people cleared > the m2 > > >> and ivy2 cahce, and rerun the command. But unfortunately didn't work > for > > >> me. I've been stuck here, I really hope anyone can help me with this > issue. > > >> > > >> Thank you all. > > >> Regards, > > >> SaSa > > >> > > >> > > >> > > >> -- > > >> Mohammed El Sayed > > >> Computer Science Department > > >> King Abdullah University of Science and Technology > > >> 2351 - 4700 KAUST, Saudi Arabia > > >> Home Page < > http://cloud.kaust.edu.sa/SiteCollectionDocuments/melsayed.aspx> > > > > > > > > > > > -- > > Harsh J > >
