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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HELIX-601) Allow work flow to schedule dependency jobs in parallel
Date Wed, 01 Jul 2015 05:26:04 GMT

    [ https://issues.apache.org/jira/browse/HELIX-601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14609577#comment-14609577
] 

ASF GitHub Bot commented on HELIX-601:
--------------------------------------

Github user jicongrui commented on the pull request:

    https://github.com/apache/helix/pull/30#issuecomment-117438877
  
    The assignment follows the same logic as before, and it can be considered as a black box,
whose input is job and output is task assignment.
    So this diff only checks the output, task assignment, and remove busy instances from task
assignment.
    
    E.g. If the target resource change resource to a different set of instances, the task
assignment would contain no busy instances, so job2 can be executed on any of the new instance.


> Allow work flow to schedule dependency jobs in parallel
> -------------------------------------------------------
>
>                 Key: HELIX-601
>                 URL: https://issues.apache.org/jira/browse/HELIX-601
>             Project: Apache Helix
>          Issue Type: New Feature
>            Reporter: Congrui Ji
>
> Currently, Helix won't schedule dependency jobs in a same work flow. For example, if
Job2 depends on Job1, Job2 won't be scheduled until every partition of Job1 is completed.
> However, if some participant is very slow, then all dependency jobs is waiting for that
single participant.
> Helix should be able to schedule multiple jobs according to a parameter.
> A.C.
> 1. Introduce parallel count parameter in work flow and job queue.
> 2. Dependency jobs can be scheduled according to the parameter (Now the parameter is
always 1, so no parallel)
> 3. If Job2 depends on Job1, Job1 is scheduled before Job2.
> 4. No parallel jobs on the same instance. If a instance is running Job1, it won't run
Job2 until Job1 is finished. 



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