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From He Chen <airb...@gmail.com>
Subject Hadoop's deafult FIFO scheduler
Date Thu, 14 Oct 2010 17:06:26 GMT
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

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