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From "Taras Ledkov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-9171) Use lazy mode with results pre-fetch
Date Fri, 17 Aug 2018 13:31:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-9171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Taras Ledkov updated IGNITE-9171:
---------------------------------
    Fix Version/s: 2.7

> Use lazy mode with results pre-fetch
> ------------------------------------
>
>                 Key: IGNITE-9171
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9171
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>    Affects Versions: 2.6
>            Reporter: Taras Ledkov
>            Assignee: Taras Ledkov
>            Priority: Major
>              Labels: sql-stability
>             Fix For: 2.7
>
>
> Current implementation of the {{lazy}} mode always starts separate thread for {{MapQueryLazyWorker}}.
It  causes excessive overhead for requests that produces small results set.
> We have to begin execute query at the {{QUERY_POOL}} thread pool and fetch first page
of the results. In case results set is bigger than one page {{MapQueryLazyWorker}} is started
and link with {{MapNodeResults}} to handle next pages lazy.



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