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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-481) IndexReader.getCurrentVersion() and isCurrent should use commit lock.
Date Fri, 23 Dec 2005 02:42:31 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-481?page=all ]
     
Yonik Seeley resolved LUCENE-481:
---------------------------------

    Fix Version: 1.9
     Resolution: Fixed

Thanks Luc, i've commited this!

> IndexReader.getCurrentVersion() and isCurrent should use commit lock.
> ---------------------------------------------------------------------
>
>          Key: LUCENE-481
>          URL: http://issues.apache.org/jira/browse/LUCENE-481
>      Project: Lucene - Java
>         Type: Bug
>   Components: Index
>     Versions: CVS Nightly - Specify date in submission
>  Environment: Windows platform, all Lucene versions
>     Reporter: Luc Vanlerberghe
>      Fix For: 1.9
>  Attachments: LUCENE-481.patch
>
> There is a race condition if one machine is checking the current version of an index
while another wants to update the segments file in IndexWriter.close().
> java.io.IOException: Cannot delete segments
> 	at org.apache.lucene.store.FSDirectory.renameFile(FSDirectory.java:213)
> 	at org.apache.lucene.index.SegmentInfos.write(SegmentInfos.java:90)
> 	at org.apache.lucene.index.IndexWriter$3.doBody(IndexWriter.java:503)
> 	at org.apache.lucene.store.Lock$With.run(Lock.java:109)
> 	at org.apache.lucene.index.IndexWriter.mergeSegments(IndexWriter.java:501)
> 	at org.apache.lucene.index.IndexWriter.flushRamSegments(IndexWriter.java:440)
> 	at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:242)
> On the windows platform reading the contents of a file disallows deleting the file.
> I use Lucene to maintain an index of +-700.000 documents, one server adds documents,
while other servers handle the searches.
> The search servers poll the index version regularly to check if they have to reopen their
IndexSearcher.
> Once in a while (about once every two days on average), IndexWriter.close() fails because
it cannot delete the previous segments file, even though it hold the commit lock.
> The reason is probably that search servers are reading the segments file to check the
version without using the commit lock.

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