Hi Hemanth all jobs were submitted within a minute and a few seconds between jobs. The hadoop version is 0.20.2
Thanks On Thu, Oct 14, 2010 at 11:45 PM, Hemanth Yamijala <yhema...@gmail.com>wrote: > Hi, > > On Thu, Oct 14, 2010 at 10:59 PM, He Chen <airb...@gmail.com> wrote: > > they arrived in 1 minute. I understand there will be a setup phase which > > will use any free slot no matter map or reduce. > > > > You mean all jobs were submitted within a minute ? That means a few > seconds between jobs ? Or do you mean each job was submitted a minute > after the earlier job. Also, which version of Hadoop is this ? > > > My queue time is the period between the start of Map stage and the time > job > > is submitted. Because the setup phase has the higher priority than map > and > > reduce tasks. Any job submitted in the queue will setup no matter how > many > > previous map and reduce tasks need to be assigned. > > > > Now, I am sure the job3 setup stage finished earlier than job4's. > However, > > job3's map stage start later than job4's. BTW, they request same amount > of > > blocks. > > > > > > On Thu, Oct 14, 2010 at 12:10 PM, abhishek sharma <absha...@usc.edu> > wrote: > > > >> What is the inter-arrival time between these jobs? > >> > >> There is a "set up" phase for jobs before they are launched. It is > >> possible that the order of jobs can change due to slightly different > >> set up times. Apart from the number of blocks, it may matter "where" > >> these blocks lie. > >> > >> Abhishek > >> > >> On Thu, Oct 14, 2010 at 10:06 AM, He Chen <airb...@gmail.com> wrote: > >> > Hi all > >> > > >> > I am testing the performance of my Hadoop clsuters with Hadoop Default > >> FIFO > >> > schedular. But I find a interesting phenomina. > >> > > >> > When I submit a series of jobs, some job will be executed earlier even > >> they > >> > are submitted late. All jobs are request same amount of blocks. For > >> example: > >> > job 1 submit at time 0 > >> > job 2 submit at time 1 > >> > job 3 submit at time 2 > >> > job 4 submit at time 3 > >> > > >> > > >> > job 4 's queue time is smaller than job3's queue time. This disobey > the > >> FIFO > >> > principle. Any one can give a hint? > >> > > >> > Thanks > >> > > >> > Chen > >> > > >> > > >
