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https://issues.apache.org/jira/browse/HAMA-757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13655827#comment-13655827
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Edward J. Yoon commented on HAMA-757:
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{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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