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https://issues.apache.org/jira/browse/LUCENE-5574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-5574:
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Attachment: LUCENE-5574.patch
Patch, starting from Simon's, but also checking in IW.deletePendingFiles and
down in IndexFileDeleter.deleteFile (where it actually does the delete).
Core tests pass (once anyway), but lots of tests still need fixing, to either
close the IW after any NRT readers, or to fix MDW to not care about extra
files; there will be a long tail of random failures until we fix all tests...
I'll do some distributed beasting.
> 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: 4.8, 5.0, 4.7.1
> Reporter: Simon Willnauer
> Priority: Critical
> Fix For: 4.8, 5.0
>
> Attachments: LUCENE-5574.patch, LUCENE-5574.patch
>
>
> 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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