forgot to mention that the related JIRA is

On Thu, May 3, 2012 at 4:03 PM, Claudio Martella
<claudio.marte...@gmail.com> wrote:
> Hi Sebastian,
> I definitely agree with you on this one.
> I'm currently working on it, but I'm kind of stuck with a small bug to
> be accounted to some concurrency we can't understand (I have a 4
> liners that can reproduce it, if you want to help out). Avery and I
> are currently discussing on the possibility to write a paper on the
> solution, so hopefully I should be able to let you know better in a
> couple of weeks.
> On Thu, May 3, 2012 at 3:44 PM, Sebastian Schelter <s...@apache.org> wrote:
>> Hi,
>> I'd like to ask whether someone is currently working on out-of-core
>> messaging for Giraph (e.g. by spilling messages to disk in case of
>> memory pressure).
>> I ran some experiments with Giraph on a small 6-machine cluster and got
>> really nice results for smaller datasets such as the wikipedia pagelink
>> graph (6M vertices, ~250M edges in its undirected version).
>> For larger graphs with a even more skewed degree distribution such as
>> the twitter follower graph from [1], Giraph crashes in the first
>> superstep unfortunately. My colleagues observed the same, when they ran
>> benchmarks of Giraph against the Stratosphere system [2], where Giraph
>> did kind of well for small datasets, but again crashed for larger ones...
>> I think the lack of out-of-core messages is currently the biggest
>> obstacle to recommending people to test Giraph in production use.
>> Best,
>> Sebastian
>> [1] http://konect.uni-koblenz.de/networks/twitter
>> [2] http://www.stratosphere.eu/
> --
>    Claudio Martella
>    claudio.marte...@gmail.com

   Claudio Martella

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