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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-5571) Make sure that cache-less execution works as good as cache-based
Date Fri, 15 Dec 2017 07:53:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-5571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292157#comment-16292157
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Vladimir Ozerov commented on IGNITE-5571:
-----------------------------------------

[~al.psc], I think I understood why we set distributed joins flag for local query with parallelism
- see {{DistributedJoinMode.LOCAL_ONLY}}.

> Make sure that cache-less execution works as good as cache-based
> ----------------------------------------------------------------
>
>                 Key: IGNITE-5571
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5571
>             Project: Ignite
>          Issue Type: Task
>          Components: sql
>            Reporter: Vladimir Ozerov
>            Assignee: Alexander Paschenko
>            Priority: Critical
>             Fix For: 2.4
>
>
> Compare the following two methods:
> 1) {{GridQueryProcessor.querySqlFields}} - old good entry point for query execution;
> 2) {{GridQueryProcessor.querySqlFieldsNoCache}} - new method for "cache-less" execution.
> Note how cache context is used in the first method:
> 1) First, it helps determine whether query can be converted to "local"
> 2) Second, it gets query parallelism of current cache, and if it differs from {{1}},
then it turns on {{distributedJoins}}.
> Neither of this happens in the second implementation. Moreover, I had to throw an exception
for local queries, as I didn't know how to handle them properly.
> We need to investigate and fix these two deficiencies somehow. Probably some inputs from
[~sergi.vladykin] would be required, to understand what is going on.
> Our ultimate goal is to make "cache-less" execution as good as the old one.



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