[jira] [Commented] (HAMA-531) Data re-partitioning in BSPJobClient

["Edward J. Yoon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HAMA-531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526058#comment-13526058 ] 

Edward J. Yoon commented on HAMA-531:
-------------------------------------

I think the input partitioning issue should be handled at the BSP framework level. But, VertexInputReader hold back possibilities of integration. Since user can create their own InputFormatter, I don't think it's important feature.

Moreover, once partitioning-process separated from BSP computation, it will make able to specify desired number of tasks for graph job.
                
> Data re-partitioning in BSPJobClient
> ------------------------------------
>
>                 Key: HAMA-531
>                 URL: https://issues.apache.org/jira/browse/HAMA-531
>             Project: Hama
>          Issue Type: Improvement
>            Reporter: Edward J. Yoon
>            Priority: Critical
>         Attachments: HAMA-531_1.patch, HAMA-531_2.patch, HAMA-531_final.patch
>
>
> The re-partitioning the data is a very expensive operation. By the way, currently, we processes read/write operations sequentially using HDFS api in BSPJobClient from client-side. This causes potential too many open files error, contains HDFS overheads, and shows slow performance.
> We have to find another way to re-partitioning data.

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