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Posted to issues-all@impala.apache.org by "Riza Suminto (Jira)" <ji...@apache.org> on 2022/02/10 00:29:00 UTC

[jira] [Assigned] (IMPALA-11107) Allow specifying footer size in HdfsScanner::IssueFooterRanges

     [ https://issues.apache.org/jira/browse/IMPALA-11107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Riza Suminto reassigned IMPALA-11107:
-------------------------------------

    Assignee: Riza Suminto

> Allow specifying footer size in HdfsScanner::IssueFooterRanges
> --------------------------------------------------------------
>
>                 Key: IMPALA-11107
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11107
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>    Affects Versions: Impala 4.0.0
>            Reporter: Riza Suminto
>            Assignee: Riza Suminto
>            Priority: Major
>
> Currently, FOOTER_SIZE is a constant of 100KB in HdfsScanner::IssueFooterRanges:
> [https://github.com/apache/impala/blob/57982ef/be/src/exec/hdfs-scanner.cc#L832] 
> Some scanner subclass such as HdfsOrcScanner expect that footer size is much lower at 16KB. We should add footer_size as parameter so different file format can ask for different footer range size.
> Having more precise initial range can also help reduce waste in the data cache: 
> [https://github.com/apache/impala/blob/57982ef/be/src/runtime/io/data-cache.h#L73] 



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