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From "John Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (REEF-942) Local aggregation
Date Sat, 12 Dec 2015 06:59:46 GMT

    [ https://issues.apache.org/jira/browse/REEF-942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15054095#comment-15054095
] 

John Yang commented on REEF-942:
--------------------------------

Sounds great! :)

> Local aggregation
> -----------------
>
>                 Key: REEF-942
>                 URL: https://issues.apache.org/jira/browse/REEF-942
>             Project: REEF
>          Issue Type: Sub-task
>          Components: Vortex
>            Reporter: Zhengping Qian
>
> In many applications (e.g., Logistical Regression), the amount of data sent over network
between tasklets and Vortex master is proportional to the number of tasklets. Such an I/O
cost could potentially become a performance and/or scalability bottleneck for distributing
a computation to run across many machines.
> Similar to the cases in MapReduce, results from tasklets can often be combined or aggregated
locally before sending back to reduce the total amount of I/O. In this (sub-)task, we explore
the API and runtime enhancement for enabling such local aggregation whenever possible.



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