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Date: Thu, 16 Aug 2012 15:23:04 -0700
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 <CAB0m3-Hx47-_JiH-v4iZLByQDa4Y1yQvi+_gw8tnG=wOO1yezg@mail.gmail.com>
Subject: Re: [jira] [Reopened] (GIRAPH-297) Checkpointing on master is done
 one superstep later
From: Eli Reisman <initialcontext@gmail.com>
To: dev@giraph.apache.org
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Sounds like this is a tough one. I think doing master compute after
vertices is a little counter intuitive but if it fits the existing
framework the best, then its the best option. I do think its a priority to
make sure the super step numbers a user sees when working with a master
compute or vertex in application code should like up perfectly so they see
the sequencing as rational, and appearing to run master compute before the
vertices even though it actually happens at the end of the previous
superstep. If this means inserting a well-commented "X+1" in the plumbing
code, it seems worth it to shield the user from having to work with
master.compute 2 and vertex superstep 3 as if they were the same superstep.


On Thu, Aug 16, 2012 at 2:15 PM, Maja Kabiljo (JIRA) <jira@apache.org>wrote:

>
>      [
> https://issues.apache.org/jira/browse/GIRAPH-297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel]
>
> Maja Kabiljo reopened GIRAPH-297:
> ---------------------------------
>
>
> > Checkpointing on master is done one superstep later
> > ---------------------------------------------------
> >
> >                 Key: GIRAPH-297
> >                 URL: https://issues.apache.org/jira/browse/GIRAPH-297
> >             Project: Giraph
> >          Issue Type: Bug
> >            Reporter: Maja Kabiljo
> >            Assignee: Maja Kabiljo
> >         Attachments: GIRAPH-297-1.patch, GIRAPH-297-fix.patch,
> GIRAPH-297.patch
> >
> >
> > On workers we store checkpoint X before compute() for superstep X are
> executed. On master we do it after those compute() are executed and after
> master.compute() for superstep X+1.
>
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