[jira] [Closed] (IMPALA-7171) Add docs for Kudu insert partitioning/sorting

["Alex Rodoni (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-7171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Rodoni closed IMPALA-7171.
-------------------------------
       Resolution: Fixed
    Fix Version/s: Impala 3.1.0
                   Impala 2.13.0

> Add docs for Kudu insert partitioning/sorting
> ---------------------------------------------
>
>                 Key: IMPALA-7171
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7171
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Docs
>            Reporter: Thomas Tauber-Marshall
>            Assignee: Alex Rodoni
>            Priority: Major
>              Labels: docs
>             Fix For: Impala 2.13.0, Impala 3.1.0
>
>
> On the page: http://impala.apache.org/docs/build3x/html/topics/impala_kudu.html, at the end of the section: "Impala DML Support for Kudu Tables (INSERT, UPDATE, DELETE, UPSERT)", we should add text like:
> Starting from Impala 2.9, Impala will automatically add a partition and sort step to INSERTs before sending the rows to Kudu. Since Kudu partitions and sorts rows on write, pre-partitioning and sorting takes some of the load off of Kudu, and helps ensure that large INSERTs complete without timing out, but it may slow down the end-to-end performance of the INSERT. Starting from Impala 2.10, the hints "/* +noshuffle,noclustered */" may be used to turn this pre-partitioning and sorting off. Additionally, since sorting may consume a lot of memory, users should consider setting a "mem_limit" for these queries.



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