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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-6084) SQL: improve lazy execution threading model
Date Wed, 16 Aug 2017 13:42:00 GMT
Vladimir Ozerov created IGNITE-6084:
---------------------------------------

             Summary: SQL: improve lazy execution threading model
                 Key: IGNITE-6084
                 URL: https://issues.apache.org/jira/browse/IGNITE-6084
             Project: Ignite
          Issue Type: Task
          Components: sql
    Affects Versions: 2.1
            Reporter: Vladimir Ozerov
             Fix For: 2.2


Currently "lazy" mode creates new thread for every query. Moreover, messages are queued to
query pool first and then re-submitted to target thread. This makes execution of small queries
inefficient. 

We need to do the following:
1) Define separate pool for lazy execution
2) It's size should be about 4 x cores, due to blocking nature of lazy execution
3) Set thread timeouts
4) Submit new query execute request to pool's shared queue from {{GridIoManager}} directly
5) Submit "next page" requests to directly to proper thread, using [nodeId, queryId, segment]
triplet
6) Cancel request can be submitted to query pool and re-submitted to appropriate threads afterwards.




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