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From "Jan van der Lugt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-297) Checkpointing on master is done one superstep later
Date Mon, 13 Aug 2012 17:47:38 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433354#comment-13433354
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Jan van der Lugt commented on GIRAPH-297:
-----------------------------------------

This is expected: the at the end of superstep X, when the master aggregated the values, it
executes master.compute for X+1. This way, it logically executes _before_ the vertex.computes.
Since the master.compute is also executed at the end of input_superstep, the vertices have
the masters values at the beginning superstep 0. When I implemented this, aggregator values
were not checkpointed, I believe, so I did not think this would interfere with anything. Maybe
it's different now. I agree that this is not the most beautiful approach, but I tried various
and this was the only one I was able to get running (with master executing before the vertices
instead of after).
                
> 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
>
> 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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