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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1464) FSDirectory.getDirectory always creates index path
Date Sat, 22 Nov 2008 16:30:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649940#action_12649940
] 

Andrzej Bialecki  commented on LUCENE-1464:
-------------------------------------------

The patch looks fine to me in the sense that it solves my issue, I'm not sure though if this
behavior isn't even less intuitive than before. I'm curious why we shouldn't re-instate the
no-create API in Directory?

> FSDirectory.getDirectory always creates index path
> --------------------------------------------------
>
>                 Key: LUCENE-1464
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1464
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 2.4, 2.9
>            Reporter: Andrzej Bialecki 
>            Assignee: Michael McCandless
>         Attachments: LUCENE-1464.patch
>
>
> This was reported to me as a Luke bug, but going deeper it proved to be a non-intuitive
(broken?) behavior of FSDirectory.
> If you use FSDirectory.getDirectory(File nonexistent) on a nonexistent path, but one
that is located under some existing parent path, then FSDirectory:174 uses file.mkdirs() to
create this directory. One would expect a variant of the method with a boolean flag to decide
whether or not to create the output path. However, the API with "create" flag is now deprecated,
with a comment that points to IndexWriter's "create" flag. This comment is misleading, because
the indicated path is created anyway in the file system just by calling FSDirectory.getDirectory().
> I propose to do one of the following:
> * reinstate the variant of the method with "create" flag. In case if this flag is false,
and the index directory is missing, either return null or throw an IOException,
> * keep the API as it is now, but either return null or throw IOException if the index
dir is missing. This breaks the backwards compatibility, because now users are required to
do file.mkdirs() themselves prior to calling FSDirectory.getDirectory().

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