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Posted to issues@impala.apache.org by "Zoltán Borók-Nagy (Jira)" <ji...@apache.org> on 2021/10/08 08:37:00 UTC

[jira] [Resolved] (IMPALA-10914) Iceberg query create inconsistent scan ranges between consecutive runs

     [ https://issues.apache.org/jira/browse/IMPALA-10914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltán Borók-Nagy resolved IMPALA-10914.
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    Fix Version/s: Impala 4.1.0
       Resolution: Fixed

> Iceberg query create inconsistent scan ranges between consecutive runs
> ----------------------------------------------------------------------
>
>                 Key: IMPALA-10914
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10914
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Distributed Exec
>    Affects Versions: Impala 4.0.0
>            Reporter: Riza Suminto
>            Assignee: Zoltán Borók-Nagy
>            Priority: Major
>              Labels: impala-iceberg
>             Fix For: Impala 4.1.0
>
>
> When running a same query several times against hive table, scan ranges assignment between query runs are identical. This helps towards efficiently hitting already cached file handles and data.
> However, for iceberg table query, consecutive runs of the same query yield varying scan range assignment. This lead to more cache miss and slower scans.
>  



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