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Posted to issues-all@impala.apache.org by "Alex Rodoni (Jira)" <ji...@apache.org> on 2019/09/26 23:19:00 UTC

[jira] [Commented] (IMPALA-8826) Impala Doc: Add docs for PLAN_ROOT_SINK and result spooling

    [ https://issues.apache.org/jira/browse/IMPALA-8826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16939027#comment-16939027 ] 

Alex Rodoni commented on IMPALA-8826:
-------------------------------------

https://gerrit.cloudera.org/#/c/14314/

> Impala Doc: Add docs for PLAN_ROOT_SINK and result spooling
> -----------------------------------------------------------
>
>                 Key: IMPALA-8826
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8826
>             Project: IMPALA
>          Issue Type: Sub-task
>          Components: Docs
>            Reporter: Sahil Takiar
>            Assignee: Alex Rodoni
>            Priority: Major
>              Labels: future_release_doc
>
> Currently, I don't see many docs explaining what a {{PLAN_ROOT_SINK}} is, even though it shows up in explain plans and runtime profiles. After more of the changes inĀ IMPALA-8656 are merged, understanding what {{PLAN_ROOT_SINK}} is will be more important, because it will start taking up a memory reservation and possibly spilling to disk.
> I don't see any docs on data sinks in general, so perhaps it would be useful to create a dedicated page for explaining data sinks and how they work. We can start by documenting the {{PLAN_ROOT_SINK}} as that may be the most commonly used one.
> We should document all the changes being made inĀ IMPALA-8656 as well.
> Query option: 
> SPOOL_QUERY_RESULTS
> MAX_RESULT_SPOOLING_MEM
> MAX_SPILLED_RESULT_SPOOLING_MEM
> FETCH_ROWS_TIMEOUT_MS (https://issues.apache.org/jira/browse/IMPALA-7312)



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