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Posted to dev@ignite.apache.org by "Taras Ledkov (JIRA)" <ji...@apache.org> on 2018/08/02 15:17:00 UTC

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

Taras Ledkov created IGNITE-9171:
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             Summary: 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


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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