[GitHub] tajo pull request: TAJO-1130 Concurrent execution of independent e...

[jihoonson <gi...@git.apache.org>]

Github user jihoonson commented on the pull request:

    https://github.com/apache/tajo/pull/423#issuecomment-106184219
  
    +1. This patch looks good to me.
    I've simply evaluated performance gain with this patch as follows.
    
    ### Configurations and environment
    * Broadcast join is disabled.
    * The test is conducted on my desktop which equips 8 cores, 32 GB memory, and 2 HDDs.
    
    ### Data
    * Input: TPC-H scale factor of 1
    
    ### Query
    ```
    tpch> select sleep(1) from region, nation where n_regionkey = r_regionkey;
    ```
    
    ### Result
    * with QUERY_EXECUTE_PARALLEL 1: 30.399 sec
    * with QUERY_EXECUTE_PARALLEL 2: 25.571 sec
     * The performance is improved due to the two input relations are read concurrently.


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