On Thu, Feb 18, 2010 at 12:00 AM, arun kumar <arunkumar_sk...@yahoo.com> wrote: > My questions are: > 1. Will such a change improve the performance? Considering the overhead > caused by moving the data blocks.
In some special case, it might improve the performance, but it depends on your application. > 2. I believe I will have to start from the NameNode to move the blocks. If > anyone can give me a brief explanation on the process to implement this or > even sources to find information on this it would be very helpful. I think some of the work might initiate from client. Could you describe what you want to do in detail? 1 do you want to specify datanode to store special blocks, or only want some blocks are located together? 2 do you want to specify the location of all the replicas of a block, or only want to specify one of the replicas. -- Wang Xu Stephen Leacock - "I detest life-insurance agents: they always argue that I shall some day die, which is not so." - http://www.brainyquote.com/quotes/authors/s/stephen_leacock.html
