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https://issues.apache.org/jira/browse/LUCENE-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-1453:
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Attachment: LUCENE-1453.patch
This is the solution using the FilterIndexReader, all tests now pass (with
refcounting deprectated dirs as well as FSDir.open-dirs, see next Patch).
The solution consists of two parts:
- All closeDirectory stuff is removed from DirectoryIndexReader (even the ugly
FSDir cloning) and from ReadOnlyDirectoryIndexReader; the code is now simplier
to understand. It is now on the status for 3.0, no deprecated helper stuff
anymore in these internal classes. So they can be used in 3.0 without
modifications.
- As the DirectoryIndexReader is not closing the directory anymore, the
deprectated IndexReader.open methods taking String/File would not work anymore
correctly (because they miss to close the dir on closing). To fix this easily,
a deprectated private class extends FIlterIndexReader was added, that wraps
around the DirectoryIndexReader, when File/String opens are used. This class
keeps a refcounter that is incremented on reopen/clone and decremented on
doClose(). The last doClose, closes the directory. In 3.0 this class can be
removed easily with all File/String open() methods. I could remove this class
from IndexReader.java and put in a separate package-private file, if you like.
I would like to have this in 2.9, to get rid of these ugly closeDirectory
hacks! All tests pass (I retried TestIndexReaderReopen about hundred times and
no variant fails anymore). It also works, when replacing the refcounting
FSDir.getDirectory by FSDir.open() calls (see next patch).
> When reopen returns a new IndexReader, both IndexReaders may now control the
> lifecycle of the underlying Directory which is managed by reference counting
> ---------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1453
> URL: https://issues.apache.org/jira/browse/LUCENE-1453
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 2.4
> Reporter: Mark Miller
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.4.1, 2.9
>
> Attachments: Failing-testcase-LUCENE-1453.patch, LUCENE-1453.patch,
> LUCENE-1453.patch, LUCENE-1453.patch, LUCENE-1453.patch
>
>
> Rough summary. Basically, FSDirectory tracks references to FSDirectory and
> when IndexReader.reopen shares a Directory with a created IndexReader and
> closeDirectory is true, FSDirectory's ref management will see two decrements
> for one increment. You can end up getting an AlreadyClosed exception on the
> Directory when the IndexReader is open.
> I have a test I'll put up. A solution seems fairly straightforward (at least
> in what needs to be accomplished).
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