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From "Taras Ledkov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-9171) Use lazy mode with results pre-fetch
Date Tue, 04 Sep 2018 15:34:02 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-9171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603198#comment-16603198
] 

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

[~vozerov], please take a look at the benchmark results.
Benchmark configuration: 
- 4 servers, 8 clients.
- 1 backups;

Benchmark names agenda:
- rN - results set size (one row, 1K and 2k rows, 1M rows)
- lazy - lazy mode on.

Operations per second:
||    ||   master   || ignite-9171  ||
| r1        | 154,550.61   | 153,534.05    | 
| r1K       | 6,097.21     | 6,027.85      | 
| r2K       | 3,523.90     | 3,478.26      | 
| r1M       | 16.51        | 16.45         | 
| r1-lazy   | 24,474.02    | 146,916.20    | 
| r1K-lazy  | 2,014.16     | 6,043.35      | 
| r2K-lazy  | 1,839.11     | 3,503.99      | 
| r1M-lazy  | 21.09        | 21.00         | 


> 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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