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https://issues.apache.org/jira/browse/TAJO-385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13860013#comment-13860013
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Jihoon Son commented on TAJO-385:
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I finally submitted the patch.
Thanks guys!
> Refactoring TaskScheduler to assign multiple fragments
> ------------------------------------------------------
>
> Key: TAJO-385
> URL: https://issues.apache.org/jira/browse/TAJO-385
> Project: Tajo
> Issue Type: Improvement
> Components: query master
> Affects Versions: 0.8-incubating
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Attachments: TAJO-385.patch, TAJO-385_2.patch, TAJO-385_3.patch,
> TAJO-385_4.patch, TAJO-385_5.patch
>
>
> In the current implementation, each task processes only one fragment.
> However, processing multiple fragments in a task will increase the query
> processing performance according to the storage layout and the user queries.
> In this issue, TaskScheduler is refactored to enable assigning multiple
> fragments to each task.
> Followings should be contained.
> * Schedule Fragments instead of QueryUnits in TaskScheduler
> ** The QueryUnit creation is postponed until TaskScheduler receives task
> requests from workers.
> ** When TaskScheduler receives task requests from workers, it dynamically
> creates an QueryUnit and assigns one or more fragments.
> ** The fragment scheduling should take into account the disk load balancing.
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