[jira] Commented: (LUCENE-1314) IndexReader.reopen(boolean force)

["Hoss Man (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-1314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609456#action_12609456 ] 

Hoss Man commented on LUCENE-1314:
----------------------------------

I haven't really been following this issue, but this comment caught my eye...

bq. So unless we try to track this, when there are N clones out there, any one of them will be allowed to grab the write lock when a change (deletion or setNorm) is attempted, thus preventing all the other clones (and all readers open on previous commits) from making changes.

...and gave me an erie sense of deja vu.  looking back at LUCENE-743, the original approach for reopen was based on cloning and prompted this comment from me...

https://issues.apache.org/jira/browse/LUCENE-743?focusedCommentId=12534123#action_12534123

...which led to some interesting discussion about what the semantics of cloning an IndexReader should be (even though ultimately cloning wasn't used).



> IndexReader.reopen(boolean force)
> ---------------------------------
>
>                 Key: LUCENE-1314
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1314
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>    Affects Versions: 2.3.1
>            Reporter: Jason Rutherglen
>            Assignee: Michael McCandless
>            Priority: Minor
>         Attachments: lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, lucene-1314.patch
>
>
> Based on discussion http://www.nabble.com/IndexReader.reopen-issue-td18070256.html.  The problem is reopen returns the same reader if there are no changes, so if docs are deleted from the new reader, they are also reflected in the previous reader which is not always desired behavior.

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