[teiid-issues] [JBoss JIRA] (TEIID-4208) Increase plan parallelism

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-4208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13240646#comment-13240646 ] 

Steven Hawkins commented on TEIID-4208:
---------------------------------------

Progress on this has been slow.   There are two approaches - either use a multi-threaded approach to additional execution points in the plan that are isolated from overall plan processing or try to insert general parallel processing at branch points.  The most logical place for isolated parallelization would be during sorting - ideally both the initial and the merge phase (with the plan structure guiding when the parallelization is attempted).  Inserting at branch points is a little more difficult in that a similar amount of plan analysis needs done and we have to update at least the commandcontext to have more thread-safe logic.  Initial testing with either has not been all that positive.  It may also be worth some time to just do more issues like TEIID-4210 (such as sort / dependent join latency) as well.

> Increase plan parallelism
> -------------------------
>
>                 Key: TEIID-4208
>                 URL: https://issues.jboss.org/browse/TEIID-4208
>             Project: Teiid
>          Issue Type: Sub-task
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 9.x
>
>
> Increased parallelism within the plan, which includes parallelization of source queries via partitioning beyond multi-source and parallelizing the execution of union branches.



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