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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (IGNITE-9933) SQL: lazy mode isn't used on reduce step
Date Fri, 15 Feb 2019 14:21:00 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-9933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov reassigned IGNITE-9933:
---------------------------------------

    Assignee:     (was: Taras Ledkov)

> SQL: lazy mode isn't used on reduce step
> ----------------------------------------
>
>                 Key: IGNITE-9933
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9933
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>    Affects Versions: 2.6
>            Reporter: Taras Ledkov
>            Priority: Major
>
> Lazy execution is introduced as default by IGNITE-9171.
> But queries are executed lazy only in  map phase now.
> So, we have introduce lazy query execution on reduce step when merge table is user to
prevent waits for fetch all results on reduce step and excessive allocate memory.
> It will be applicable for queries sorted by index.
> Attention: when reduce query is executed in lazy mode the release remote resource and
query cancellation must be changed.
> See:
> - {{GridReduceQueryExecutor#query}}
> - {{GridReduceQueryExecutor#releaseRemoteResources}}



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