Marta Kuczora created HIVE-22918:
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Summary: Investigate empty bucket file creation for ACID tables
Key: HIVE-22918
URL: https://issues.apache.org/jira/browse/HIVE-22918
Project: Hive
Issue Type: Task
Affects Versions: 4.0.0
Reporter: Marta Kuczora
Assignee: Marton Bod
When creating an insert-only bucketed table with 5 buckets, and we insert only
one row to this table, Hive creates empty files for the other 4 buckets. This
logic is in the code for ACID tables as well, but when checking the table's
final directory after the insert, I found that only 1 files got created. When
debugged this issue, I found that the empty files are created in the staging
directory outside the delta directory, therefore they won't get copied by the
move task to the final directory. This behavior seems broken, but not sure if
we really need the empty files in this case.
This Jira is about investigating whether or not we need these empty files for
ACID tables and if we do, fix the code to have them for ACID tables as well.
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