Ian Boston commented on OAK-3547:

Using Lucene directly to manage generations of the segments file is covered in 

> Improve ability of the OakDirectory to recover from unexpected file errors
> --------------------------------------------------------------------------
>                 Key: OAK-3547
>                 URL: https://issues.apache.org/jira/browse/OAK-3547
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: lucene
>    Affects Versions: 1.4
>            Reporter: Ian Boston
> Currently if the OakDirectory finds that a file is missing or in some way 
> damaged, and exception is thrown which impacts all queries using that index, 
> at times making the index unavailable. This improvement aims to make the 
> OakDirectory recover to a previously ok state by storing which files were 
> involved in previous states, and giving the code some way of checking if they 
> are valid.

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