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Posted to issues@impala.apache.org by "Vihang Karajgaonkar (JIRA)" <ji...@apache.org> on 2019/06/13 00:19:00 UTC
[jira] [Created] (IMPALA-8663) FileMetadataLoader should skip
listing files in hidden and tmp directories
Vihang Karajgaonkar created IMPALA-8663:
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Summary: FileMetadataLoader should skip listing files in hidden and tmp directories
Key: IMPALA-8663
URL: https://issues.apache.org/jira/browse/IMPALA-8663
Project: IMPALA
Issue Type: Bug
Reporter: Vihang Karajgaonkar
Assignee: Vihang Karajgaonkar
Currently, the file metadata loader recursively lists the table and partition directories to get the fileStatuses. For each filestatus we ignore the hidden files in {{FileSystemUtil.isValidDataFile}}(). However that is not sufficient. For instance, if Hive is inserting data into a table when the refresh is called, it is possible the staging directory is present within the table directory. This staging directory is a hidden directory of the naming {{.hive-staging_*}}. It is possible that this directory has files which are not hidden (starting from a . or _). Such files should be considered temporary files and should not be considered as valid data files.
Another instance where we see this happen is in transactional tables which has a {{.manifest}} which is located in a {{_tmp}} directory within the table directory. This file should also be skipped and not considered as a valid data file.
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