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https://issues.apache.org/jira/browse/IMPALA-11107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Riza Suminto resolved IMPALA-11107.
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Fix Version/s: Impala 4.1.0
Resolution: Fixed
> 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
> Fix For: Impala 4.1.0
>
>
> 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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