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From "Eli Reisman (JIRA)" <>
Subject [jira] [Commented] (GIRAPH-273) Aggregators shouldn't use Zookeeper
Date Thu, 23 Aug 2012 20:42:42 GMT


Eli Reisman commented on GIRAPH-273:

I like the master connection, in-memory option. Avery is right, memory pressure on the master
is low since it doesn't do much work during the super steps. This sounds like a great plan,
and should be fairly quick in the super steps too. The aggregation tree is a great idea because
we can piggyback aggregation connections on existing worker connections for many levels up
the tree and hopefully only 2 workers will actually ever need to add extra connections to
talk to the master.
> Aggregators shouldn't use Zookeeper
> -----------------------------------
>                 Key: GIRAPH-273
>                 URL:
>             Project: Giraph
>          Issue Type: Improvement
>            Reporter: Maja Kabiljo
>            Assignee: Maja Kabiljo
> We use Zookeeper znodes to transfer aggregated values from workers to master and back.
Zookeeper is supposed to be used for coordination, and it also has a memory limit which prevents
users from having aggregators with large value objects. These are the reasons why we should
implement aggregators gathering and distribution in a different way.

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