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From "Dmitriy Setrakyan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-4523) Allow distributed SQL query execution over explicit set of partitions
Date Mon, 09 Jan 2017 22:45:58 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15813090#comment-15813090
] 

Dmitriy Setrakyan commented on IGNITE-4523:
-------------------------------------------

I think this is a very questionable feature. We already plan support for sending a query to
a right partition in IGNITE-4510, which should be enough. Don't think we need anything beyond
that.

> 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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