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From Shen LI <geminialex...@gmail.com>
Subject Re: How many bytes does heart beat message and return value contain?
Date Sun, 12 Jun 2011 00:47:33 GMT
Hi Harsh,

Thank you very much for your reply. Do you know if there is any reference
about calculating heart beat message size  that I can turn to? If I have 4
living task under each TaskTracker,  how many bytes will one heart beat
message contain?

Thanks,

Shen

On Fri, Jun 10, 2011 at 5:06 PM, Harsh J <harsh@cloudera.com> wrote:

> Shen,
>
> It would really vary depending on how many TaskStatus objects the
> TaskTracker has to report in the heartbeat. If there are none (zero
> activity), I think the byte value (per Visual VM here) comes to about
> 60B which you can perhaps add upon.
>
> Note that I'm using OSX so perhaps the ResourceStats carried within
> aren't properly for me (some of these are Linux specific). It
> shouldn't exceed 100B in any case though, I think.
>
> Similarly, the response carries variable numbers of TaskTrackerAction
> objects, and other job related information. At zero activity I see it
> reported as 32B.
>
> HTH. These are in memory values -- network tx. is made with some form
> of serialization applied, and I'm unsure as to how much the variance
> would be.
>
> On Fri, Jun 10, 2011 at 9:49 PM, Shen LI <geminialex007@gmail.com> wrote:
> > Hi All,
> > Does anyone know how many bytes does one heart beat message contain? And
> > what about the return value of heart beat message?
> > Thanks,
> > Shen
>
>
>
> --
> Harsh J
>

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