[jira] [Commented] (IGNITE-9171) Use lazy mode with results pre-fetch

["Taras Ledkov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-9171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16635314#comment-16635314 ] 

Taras Ledkov commented on IGNITE-9171:
--------------------------------------

[~vozerov], I fixed lazy worker start/stop synchronization & result set close.
Tests are OK. Please take a look.

> Use lazy mode with results pre-fetch
> ------------------------------------
>
>                 Key: IGNITE-9171
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9171
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>    Affects Versions: 2.6
>            Reporter: Taras Ledkov
>            Assignee: Taras Ledkov
>            Priority: Blocker
>              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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