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https://issues.apache.org/jira/browse/LUCENE-846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12483734
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Michael McCandless commented on LUCENE-846:
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OK, thanks.

Hurm, I found the _, removed it, but the test still ran successfully.  Now I'm 
getting nervous!

> IOExeception can cause loss of data due to premature segment deletion
> ---------------------------------------------------------------------
>
>                 Key: LUCENE-846
>                 URL: https://issues.apache.org/jira/browse/LUCENE-846
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Steven Parkes
>         Assigned To: Michael McCandless
>
> If you hit an IOException, e.g., disk full, while making a cfs from its 
> constituent parts, you may not be able to rollback to the before-merge 
> process. This happens via addIndexes.
> I don't have a nice easy test for this; generating IOEs ain't so easy. But it 
> does happen in the patch for the factored merge policy with the existing 
> tests because the pseudo-randomly generated IOEs fall in a different place.

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