BELUGA BEHR created HIVE-21071:
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Summary: Improve getInputSummary
Key: HIVE-21071
URL: https://issues.apache.org/jira/browse/HIVE-21071
Project: Hive
Issue Type: Improvement
Components: HiveServer2
Affects Versions: 3.1.1, 3.0.0, 4.0.0
Reporter: BELUGA BEHR
There is a global lock in the {{getInptSummary}} code, so it is important that
it be fast. The current implementation has quite a bit of overhead that can be
re-engineered.
For example, the current implementation keeps a map of File Path to
ContentSummary object. This map is populated by several threads concurrently.
The method then loops through the map, in a single thread, at the end to add up
all of the ContentSummary objects and ignores the paths. The code can be be
re-engineered to not use a map, or a collection at all, to store the results
and instead just keep a running tally. By keeping a tally, there is no O(n)
operation at the end to perform the addition.
There are other things can be improved. The method returns an object which is
never used anywhere, so change method to void return type.
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