[jira] [Resolved] (IMPALA-6497) Impala should expose when the last row is fetched

["Tim Armstrong (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-6497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong resolved IMPALA-6497.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: Impala 2.12.0
                   Impala 3.0

commit ac86e9d931fa6e5d273e51c26cd7c1d1ad2cc6ce
Author: Tim Armstrong <ta...@cloudera.com>
Date:   Fri Feb 9 12:00:54 2018 -0800

    IMPALA-6497: add "Last row fetched" and AC events
    
    This makes it more observable that all rows were returned to the client
    and also that resources were released for admission control.
    
    Testing:
    Manually inspected some query profiles.
    
    Added a basic observability test that ensures that the expected events
    appear in the profile. Ran it in a loop for a bit to make sure it wasn't
    flaky.
    
    Change-Id: I32a707e4660061e75c86ad967f1fac6f6737da7e
    Reviewed-on: http://gerrit.cloudera.org:8080/9271
    Reviewed-by: Tim Armstrong <ta...@cloudera.com>
    Tested-by: Impala Public Jenkins



> Impala should expose when the last row is fetched
> -------------------------------------------------
>
>                 Key: IMPALA-6497
>                 URL: https://issues.apache.org/jira/browse/IMPALA-6497
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>    Affects Versions: Impala 2.11.0
>            Reporter: Tim Armstrong
>            Assignee: Tim Armstrong
>            Priority: Major
>              Labels: admission-control, observability
>             Fix For: Impala 3.0, Impala 2.12.0
>
>
> This is exposed indirectly via the "waiting to be closed" list in the Impala debug server. However, there is no way to tell from the profile or query state that the last row was fetched by the client.
> It is useful for this to be exposed to management tools since queries where all rows have been fetched have released resources and could be closed.



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