Simon Willnauer created LUCENE-5574:
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Summary: NRT Reader close can wipe index it doesn't own
Key: LUCENE-5574
URL: https://issues.apache.org/jira/browse/LUCENE-5574
Project: Lucene - Core
Issue Type: Bug
Components: core/index
Affects Versions: 4.7.1, 4.8, 5.0
Reporter: Simon Willnauer
Priority: Critical
Fix For: 4.8, 5.0
Today NRT Readers try to clean up unused files via their IW reference when they
are closed. Yet, if the index writer is already closed another index could have
been created on the same directory which can create the same files as the IW
before. For the NRT Reader those files are not referenced and it will simply
wipe them away. If you use this in a replication scenario where directories are
reused this can simply wipe your index away or in combination with the FSync
issue LUCENE-5570 create 0-byte files. I have a test that reproduces this issue
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