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From "Edward J. Yoon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-757) The partitioning job output should be un-splitable
Date Mon, 13 May 2013 07:43:16 GMT

    [ https://issues.apache.org/jira/browse/HAMA-757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13655827#comment-13655827
] 

Edward J. Yoon commented on HAMA-757:
-------------------------------------

{quote} Some times, this uncertainty make the job exceed the cluster slot capacity. {quote}

Thanks for sharing your great experience! If I remember correctly, the block size is configurable
per file (when create a file on HDFS).
                
> The partitioning job output should be un-splitable
> --------------------------------------------------
>
>                 Key: HAMA-757
>                 URL: https://issues.apache.org/jira/browse/HAMA-757
>             Project: Hama
>          Issue Type: Bug
>          Components: bsp core
>    Affects Versions: 0.6.1
>            Reporter: MaoYuan Xian
>
> When the output sequence files from partitioning job are large(bigger than two hdfs file
block size), the second round of the job (using these sequence file as input) will start up
more tasks than client want. Some times, this uncertainty make the job exceed the cluster
slot capacity.
> In the real project, I implemented an new Inputformat which marked as un-splitable to
solve the problem. Is there any better way?

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