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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-4523) Allow distributed SQL query execution over explicit set of partitions
Date Thu, 05 Jan 2017 07:24:58 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15800616#comment-15800616
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Vladimir Ozerov commented on IGNITE-4523:
-----------------------------------------

Alex,

IGNITE-4517 is about distributed queries of course :-) This is why I though that this ticket
is duplicate - they both aim to restrict distributed query execution to certain partitions.
As per int[]. may be array is not the best choice. However, I also do not like partition range
- it appears to be too specific. Usually partitions are distributed in "random" fashion from
user perspective.

> Allow distributed SQL query execution over explicit set of partitions
> ---------------------------------------------------------------------
>
>                 Key: IGNITE-4523
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4523
>             Project: Ignite
>          Issue Type: Improvement
>          Components: cache, SQL
>    Affects Versions: 1.8
>            Reporter: Alexei Scherbakov
>            Assignee: Alexei Scherbakov
>             Fix For: 2.0
>
>
> Currently distributed SQL query is executed on all nodes containing primary partitions
for a cache, sending map query requests on all nodes in grid.
> Sometimes we know in advance which partitions hold a data for query, on example, in case
of custom affinity function. 
> Therefore it's possible to reduce number of nodes receiving map query request by providing
explicit set of partitions, which will give significant performance advantage and traffic
reduction in case of very large clusters.
> Internally we already have such functionality, so the only necessary thing is to provide
public API for what.



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