On 10 Oct 2014, at 18:06, Dan Berindei <[email protected]> wrote:
>
> The biggest downside I see is that it would be horribly slow if the cache
> store doesn't support efficient iteration of a single segment. So we might
> want to implement a full retry strategy as well, if some cache stores can't
> support that.
>
My understanding from a discussion with Pedro (in a hard, cold and sinister
place but that’s another story) is that *today* M/R is kinda horrible for
global cache stores anyways that have to do the key per node filtering dance
anyways. So it’s not significantly worse.
Plus I said we should do work per segment but in reality if you send 5 Map
segment work to the same node, you can optimize and do a single loop only
making it feel like they are separated work.
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