Hi, On Sun, Apr 13, 2014 at 10:47 AM, Mahesh Khandewal <mahesh.k....@gmail.com> wrote: > Sir i am using Hadoop 1.1.2 > I don't know where is the code residing of default scheduler?
Doing a simple 'find' in the source checkout for name pattern 'Scheduler' should reveal pretty relevant hits. We do name our Java classes seriously :) https://github.com/apache/hadoop-common/blob/release-1.1.2/src/mapred/org/apache/hadoop/mapred/JobQueueTaskScheduler.java > I want to change the default scheduler to fair how can i do this?? You can override the mapred-site.xml placed property 'mapred.jobtracker.taskScheduler' to specify a custom scheduler (or a supplied one, such as Fair [http://hadoop.apache.org/docs/r1.1.2/fair_scheduler.html] or Capacity [http://hadoop.apache.org/docs/r1.1.2/capacity_scheduler.html] Schedulers). > And if i want to get back to default scheduler how can i do this? Remove the configuration override, and it will always go back to the default FIFO based scheduler, the same whose source has been linked above. > I am struggling since 4 months to get help on Apache Hadoop?? Are you unsure about this? -- Harsh J
