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Posted to issues@impala.apache.org by "Alexandra Rodoni (Jira)" <ji...@apache.org> on 2019/10/07 23:36:00 UTC
[jira] [Closed] (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:all-tabpanel ]
Alexandra Rodoni closed IMPALA-8826.
------------------------------------
Fix Version/s: Impala 3.4.0
Resolution: Fixed
> 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: Alexandra Rodoni
> Priority: Major
> Labels: future_release_doc, in_34
> Fix For: Impala 3.4.0
>
>
> 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 in 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 in 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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