Riza Suminto created IMPALA-11107:
-------------------------------------
Summary: 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
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]
--
This message was sent by Atlassian Jira
(v8.20.1#820001)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
