Sahil Takiar created HIVE-16003:
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Summary: Blobstores should use fs.listFiles(path, recursive=true)
rather than FileUtils.listStatusRecursively
Key: HIVE-16003
URL: https://issues.apache.org/jira/browse/HIVE-16003
Project: Hive
Issue Type: Sub-task
Reporter: Sahil Takiar
Assignee: Sahil Takiar
{{FileUtils.listStatusRecursively}} can be slow on blobstores because
{{listStatus}} calls are applied recursively to a given directory. This can be
especially bad on tables with multiple levels of partitioning.
The {{FileSystem}} API provides an optimized API called {{listFiles(path,
recursive)}} that can be used to invoke an optimized recursive directory
listing.
The problem is that the {{listFiles(path, recursive)}} API doesn't provide a
option to pass in a {{PathFilter}}, while {{FileUtils.listStatusRecursively}}
uses a custom HIDDEN_FILES_PATH_FILTER.
To fix this we could either:
1: Modify the FileSystem API to provide a {{listFiles(path, recursive,
PathFilter)}} method
2: Add conditional logic so that blobstores invoke {{listFiles(path,
recursive)}} and the rest of the code uses the current implementation of
{{FileUtils.listStatusRecursively}}
3: Replace the implementation of {{FileUtils.listStatusRecursively}} with
{{listFiles(path, recursive)}} and apply the {{PathFilter}} on the results
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