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Posted to issues-all@impala.apache.org by "Sahil Takiar (JIRA)" <ji...@apache.org> on 2019/08/02 16:35:00 UTC

[jira] [Created] (IMPALA-8826) Impala Doc: Add docs for PLAN_ROOT_SINK

Sahil Takiar created IMPALA-8826:
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             Summary: Impala Doc: Add docs for PLAN_ROOT_SINK
                 Key: IMPALA-8826
                 URL: https://issues.apache.org/jira/browse/IMPALA-8826
             Project: IMPALA
          Issue Type: Sub-task
          Components: Docs
            Reporter: Sahil Takiar


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.



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