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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: [DISCUSS]Helix for global synchronization in Hama
Date Thu, 09 May 2013 01:21:28 GMT

This would be great collaboration. Since we pursue the pluggable
interfaces for managing the synchronization[1], messenger, and job
scheduling systems (we want to preserve the classic (standalone)
cluster mode, while integrating with resource manager systems), the
integration with Helix won't be difficult.

1. http://wiki.apache.org/hama/SyncService

On Thu, May 9, 2013 at 7:01 AM, kishore g <g.kishore@gmail.com> wrote:
> Hello,
> I am starting a discussion thread on potential pros/cons of using Helix in
> Hama. I dont know the internal details of Hama, so please correct me if
> something does not make sense.
> My source of information is http://wiki.apache.org/hama/Architecture and a
> brief chat with Suraj at ApacheCon where he described the need for barriers
> between super steps.
> Please read about Apache Helix here http://helix.incubator.apache.org/.
> Architecture wise Helix maps pretty well with the components in Hama.
> HelixController can be wrapped inside BSPMaster and GroomServer is the
> PARTICIPANT in Helix terminology that wraps Helix Agent.
> The partitioning and assigning tasks to GroomServers can be done via Helix
> Apis, it basically boils down to setting the idealstate for a particular
> stage. Starting of the next step which basically depends on all tasks in
> previous step being completed can be done by watching the ExternalView.
> In the architecture wiki, I see that there is plan to integrate with
> Zookeeper for fault tolerance. Helix internally uses Zookeeper to store the
> cluster state. So it might make it easier to make the tasks fault tolerant
> and probably restartable as well at a task level instead of job/stage level.
> We recently added a recipe in Helix to demonstrate the concept of
> dependency between resources.
> http://helix.incubator.apache.org/recipes/task_dag_execution.html
> Code:
> https://github.com/apache/incubator-helix/tree/master/recipes/task-execution/src/main/java/org/apache/helix/taskexecution
> Let me know your thoughts.
> thanks,
> Kishore G

Best Regards, Edward J. Yoon

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