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From "luoli (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1434) Dynamic add input for one job
Date Sat, 11 Sep 2010 13:00:40 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908313#action_12908313
] 

luoli commented on MAPREDUCE-1434:
----------------------------------

Of course  we prefer that this patch been reviewed, actually this feature has been proved
very helpful for us. Similar problems  people may encounter as us can be solved using this
dynamic input job feature. ShiXing, maybe you could submit a new patch for this and make it's
code conventions good. What do you think?

> Dynamic add input for one job
> -----------------------------
>
>                 Key: MAPREDUCE-1434
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1434
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>    Affects Versions: 0.20.3
>            Reporter: Xing Shi
>             Fix For: 0.20.3
>
>         Attachments: dynamic_input-v1.patch
>
>
> Always we should firstly upload the data to hdfs, then we can analize the data using
hadoop mapreduce.
> Sometimes, the upload process takes long time. So if we can add input during one job,
the time can be saved.
> WHAT?
> Client:
> a) hadoop job -add-input jobId inputFormat ...
> Add the input to jobid
> b) hadoop job -add-input done
> Tell the JobTracker, the input has been prepared over.
> c) hadoop job -add-input status jobid
> Show how many input the jobid has.
> HOWTO?
> Mainly, I think we should do three things:
> 1. JobClinet: here JobClient should support add input to a job, indeed, JobClient generate
the split, and submit to JobTracker.
> 2. JobTracker: JobTracker support addInput, and add the new tasks to the original mapTasks.
Because the uploaded data will be 
> processed quickly, so it also should update the scheduler to support pending a map task
till Client tells the Job input done.
> 3. Reducer: the reducer should also update the mapNums, so it will shuffle right.
> This is the rough idea, and I will update it .

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