Dear Todd,

Thanks for your reply.
Let me clarify my "response time" definition.

*start_time: time of request send
*1st_arrival_time: the 1st block of data been received
*completed_time: the final block of data been received

response time = 1st_arrival_time = start_time

Are you still confirmed that there is NO "response_time = O(number of datanode)" ?
If so, HDFS will be great for our application.  Thanks!!


--
Kevin Kuei


? 2011/1/6 ?? 04:23, Todd Lipcon ??:
Hi Kevin,

No, there is no O(number of datanodes) factor in performance.

-Todd

On Wed, Jan 5, 2011 at 8:04 PM, KevinKuei <kk...@above.net.tw <mailto:kk...@above.net.tw>> wrote:

    Hi,

    I'm planing for a youtube-like video online site and looking for a
    suitable file system.
    The high performance and reliability of HDFS seems to be the great
    candidate.

    But somebody told me that the response time will be linear
    increased with more data node.
    I've no enough hardwares to do the test for now.

    It will be very appreciated if anyone can provide such information.

    Thanks!!

    --
    Kevin Kuei

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--
Todd Lipcon
Software Engineer, Cloudera

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