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https://issues.apache.org/jira/browse/IMPALA-8739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltán Borók-Nagy resolved IMPALA-8739.
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Resolution: Not A Problem
HIVE-20137 is resolved which means Hive won't create empty ACID directories,
not even for TRUNCATE.
> FileMetadataLoader skips empty directories
> ------------------------------------------
>
> Key: IMPALA-8739
> URL: https://issues.apache.org/jira/browse/IMPALA-8739
> Project: IMPALA
> Issue Type: Bug
> Reporter: Vihang Karajgaonkar
> Assignee: Zoltán Borók-Nagy
> Priority: Major
> Labels: impala-acid
>
> {{FileMetadataLoader}} has certain code paths like the one below which using
> {{listFiles}} API on the filesystem. This API ignores empty directories which
> is okay for non-transactional tables. However, in case of transactional table
> an empty base directory provides writeId information which is used to skip
> loading files which are not relevant for a given writeId. See
> {{AcidUtils#filterFilesForAcidState}} usage for details.
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