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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 Tue, 28 Jul 2015 21:40:04 GMT

    [ https://issues.apache.org/jira/browse/HELIX-601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645088#comment-14645088
] 

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

Github user kishoreg commented on the pull request:

    https://github.com/apache/helix/pull/30#issuecomment-125761175
  
    This is a temporary fix that allows jobs to continue if few tasks from the previous jobs
are stuck. This is controlled via maxParallel jobs config parameter. So we can still get the
existing behavior by setting parallel jobs to 1. From jcongrui comment it looks like a temporary
fix to unblock the release and we will revisit task framework design and implementation.


> 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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