On Thu, Jun 27, 2019 at 3:32 AM Robert Bradshaw <rober...@google.com> wrote:
> On Thu, Jun 27, 2019 at 1:52 AM Rui Wang <ruw...@google.com> wrote: > >> > >> > >> AFAIK all streaming runners today practically do provide these panes > in order; > > > > Does it refer to "the stage immediately after GBK itself processes fired > panes in order" in streaming runners? Could you share more information? > > > > > >> > >> this means that likely many users implicitly rely on this "non > guarantee," probably without even knowing they are relying on it. > > > > If streaming runners have already provided or processed panes in order, > and likely many users rely on it already, why not make order of panes a > part of model explicitly? > > Most runners produce panes in order, but they don't necessarily > preserve the order downstream (at least beyond what's fused into the > same stage, which is where it gets difficult). > Actually they generally do preserve them at least to the very next fused stage. That's why I assume many users rely on this non guarantee.
