[jira] [Updated] (LUCENE-7843) DirectoryReader.listCommits graceful handling of corrupt commits is broken

["Rei Shapira (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rei Shapira updated LUCENE-7843:
--------------------------------
    Summary: DirectoryReader.listCommits graceful handling of corrupt commits is broken  (was: DirectoryReader.listCommits graceful handling of corrupt segments is broken)

> DirectoryReader.listCommits graceful handling of corrupt commits is broken
> --------------------------------------------------------------------------
>
>                 Key: LUCENE-7843
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7843
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>    Affects Versions: 6.5.1
>         Environment: Windows, MMapDirectory
>            Reporter: Rei Shapira
>
> DirectoryReader.listCommits expects FileNotFoundException and NoSuchFileException while trying to read a specific commit file - if these are thrown then that specific commit file is not returned in the list of all commits for that directory.
> LUCENE-7662 changed the behavior of SegmentInfos.readCommit to not throw these exceptions anymore, but rather CorruptIndexException.
> This causes the code in DirectoryReader.listCommits to never encounter the previous two exception types, thus throwing the CorruptIndexException all the way to the top, instead of gracefully handling a few missing commit files.
> This breaks how Luke does a clean index operation when listing all of the commits and then proceeding to delete any files inside the index directory that were not mentioned by any of the commits.



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