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From "Dmitriy Pavlov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-8591) SQL: Sort links on index pages in physical page order before row access
Date Tue, 26 Jun 2018 16:09:32 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-8591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Dmitriy Pavlov updated IGNITE-8591:
    Fix Version/s:     (was: 2.6)

> SQL: Sort links on index pages in physical page order before row access
> -----------------------------------------------------------------------
>                 Key: IGNITE-8591
>                 URL: https://issues.apache.org/jira/browse/IGNITE-8591
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>    Affects Versions: 2.5
>            Reporter: Vladimir Ozerov
>            Assignee: Vladimir Ozerov
>            Priority: Major
>              Labels: performance
>             Fix For: 2.7
> When index page match condition, we eagerly read all matched data rows. This leads to
a number of random disk reads.as Ignite use heap-organized storage. We can pre-sort all matched
row links in accordance to their physical location, and then read them in batch. This will
give us two important advantages:
> 1) Data reads will be more sequential, this is especially important for HDDs
> 2) This could decrease number of page reads in case of dense data placement, because
there will be less evictions.
> In future we should expand this optimization to several index pages in the same way it
is done in major databases. 

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