Re: Cannot find file _ov0.fnm

Wed, 16 Jan 2008 22:41:38 -0800 

Hi there,
Just in case anybody would curious, the access exception is gone after we upgrade to Lucene 2.1.0.3. 

Cheers,
Min

Min Yin wrote:

Hi DIGY,


That's very useful information, we see the same problem with our 
Lucene 2.0.0.4. Just curious if the following exceptions can also be 
caused by the same bug?



Error invoking RPC action: 
System.Reflection.TargetInvocationException: Exception has been thrown 
by the target of an invocation. ---> System.IO.IOException: The 
process cannot access the file 'C:\Documents and 
Settings\Jason\caloExpressPersistence\ver-41\lucene\index\segments' 
because it is being used by another process.

  at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

  at System.IO.FileStream.Init(String path, FileMode mode, FileAccess 
access, Int32 rights, Boolean useRights, FileShare share, Int32 
bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String 
msgPath, Boolean bFromProxy)
  at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess 
access, FileShare share)

  at Lucene.Net.Store.FSIndexInput..ctor(FileInfo path)
  at Lucene.Net.Store.FSDirectory.OpenInput(String name)
  at Lucene.Net.Index.SegmentInfos.Read(Directory directory)
  at Lucene.Net.Index.IndexReader.AnonymousClassWith.DoBody()
  at Lucene.Net.Store.Lock.With.Run()

  at Lucene.Net.Index.IndexReader.Open(Directory directory, Boolean 
closeDirectory)

  at Lucene.Net.Search.IndexSearcher..ctor(String path)


In this scenario we have two processes trying to access the same 
lucene index, and I think I read somewhere lucene should be process safe?


Thanks for your help!

Min

DIGY wrote:

Hi Nicolas,


 

I'm using Lucene.net 2.0.0 and my index file is on shared directory.

    

I think this is the bug in SimpleFSLockFactory  in Lucene.Net 2.0.0
See  https://issues.apache.org/jira/browse/LUCENENET-74
It is better to upgrade to 2.1


 

How can I save my index?

    

I don't know if there is a tool to recover the index, but i can 
propose a

solution

1-After backup, Open the segments???????? file in binary mode (~250 
byte)

2-Decrement the file# counter(it is at offset 16[4 bytes])
3-delete the entry _ov0.fnm [23 bytes]

Note: I may be wrong in offsets and lengths , so it may require some
trial&error

DIGY



-----Original Message-----

From: Nicolas OLIVERO [mailto:[EMAIL PROTECTED] Sent: Monday, 
January 14, 2008 5:22 PM

To: [email protected]
Subject: Cannot find file _ov0.fnm
Hi,


 


I'm using Lucene.net 2.0.0 and my index file is on shared directory.


 

All was working fine but today two users add a document at the same 
time.


Now when I try to search or add a document to the index I'm getting the
following error: "cannot find file _ov0.fnm".


 


How can I save my index?

 

Maybe I'm doing something wrong in my code; do I have to put a lock 
when I

add a document to the index (as my index is on a shared directory)?


 

 


Dim writer As IndexWriter

Dim champ As Field


 


Try

writer = New IndexWriter(REPERTOIRE_INDEX_FULLTEXT, New
Standard.StandardAnalyzer(), False)


 


      Dim leDocument As Document = New Document()


 


      leDocument.Add(New Field("re_id", dossier.entite.getID,
Field.Store.YES, Field.Index.NO))


      leDocument.Add(New Field("rp_td_id", 
CStr(dossier.typedoc.rp_td_id),

Field.Store.YES, Field.Index.NO))


      leDocument.Add(New Field("contenu", contenuDocument, 
Field.Store.YES,

Field.Index.TOKENIZED))


 


      Try

      writer.AddDocument(leDocument)

            '' at least on windows, some temporary files raise this
exception with an "access denied" message

            '' checking if the file can be read doesn't help

            Catch ex As FileNotFoundException


 


      End Try


     
writer.Optimize()


      writer.Close()


 


     Catch ex As IOException


         The error occurs here ------ >   MessageBox.Show("L'index 
Fulltext
n'existe pas ou est corrompu. Reconstruisez l'index. " + ex.Message, 
"Erreur

index", MessageBoxButtons.OK, MessageBoxIcon.Error)

            Return False

        Catch ex As Exception

MessageBox.Show("Erreur lors de l'indexation du document car : " +
ex.Message, "Insertion impossible", MessageBoxButtons.OK,
MessageBoxIcon.Error)

            End If

            Return False

        End Try


 

 

 


Thanks for your help,

Nicolas


 

  
























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