Henning Andersen created LUCENE-8735:
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Summary: FileAlreadyExistsException after opening old commit
Key: LUCENE-8735
URL: https://issues.apache.org/jira/browse/LUCENE-8735
Project: Lucene - Core
Issue Type: Bug
Components: core/store
Affects Versions: 8.0
Reporter: Henning Andersen
Fix For: master (9.0)
FilterDirectory.getPendingDeletes() does not delegate calls. This in turn means
that IndexFileDeleter does not consider those as relevant files.
When opening an IndexWriter for an older commit, excess files are attempted
deleted. If an IndexReader exists using one of the newer commits, the excess
files may fail to delete (at least on windows or when using the mocking
WindowsFS).
If then closing and opening the IndexWriter, the information on the pending
deletes are gone if a FilterDirectory derivate is used. At the same time, the
pending deletes are filtered out of listAll. This leads to a risk of hitting an
existing file name, causing a FileAlreadyExistsException.
This issue likely only exists on windows.
Will create pull request with fix.
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