lucene-java-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Pulkit Singhal <pulkitsing...@gmail.com>
Subject Re: IndexWriters and write locks
Date Wed, 10 Nov 2010 19:55:07 GMT
You know that really confuses me. I've heard that stated a few times and
every time I just felt that it couldn't possibly be right. Maybe it was
meant in some very specific manner because otherwise aren't all Windows OSs
off-limits to Lucene then?

On Wed, Nov 10, 2010 at 2:40 PM, Uwe Schindler <uwe@thetaphi.de> wrote:

> Are you using NFS as filesystem? NFS is incompatible to lucene :-)
>
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
>
>
> > -----Original Message-----
> > From: Pulkit Singhal [mailto:pulkitsinghal@gmail.com]
> > Sent: Wednesday, November 10, 2010 7:57 PM
> > To: java-user@lucene.apache.org
> > Subject: Re: IndexWriters and write locks
> >
> > Thanks Uwe, that helps explain why the lock file is still there.
> >
> > The last piece of the puzzle is why someone may see exceptions such as
> the
> > following from time to time:
> >
> > java.nio.channels.OverlappingFileLockException
> >     at
> >
> sun.nio.ch.FileChannelImpl$SharedFileLockTable.checkList(FileChannelImpl.java
> > :1176)
> >     at
> >
> sun.nio.ch.FileChannelImpl$SharedFileLockTable.add(FileChannelImpl.java:107
> > 8)
> >     at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:878)
> >     at java.nio.channels.FileChannel.tryLock(FileChannel.java:962)
> >     at
> > org.apache.lucene.store.NativeFSLock.obtain(NativeFSLockFactory.java:236)
> >     at org.apache.lucene.store.Lock.obtain(Lock.java:72)
> >     at org.apache.lucene.index.IndexWriter.init(IndexWriter.java:1041)
> >     at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:864)
> >
> > I suppose this means that the OS itself hasn't released the lock even
> after I shut
> > down my application server and restarted it.
> > Am I right?
> >
> > Or is there something else that can possibly be the culprit (in anyone's
> > experience) that I can investigate?
> >
> > - Pulkit
> >
> > On Wed, Nov 10, 2010 at 12:57 PM, Uwe Schindler <uwe@thetaphi.de> wrote:
> >
> > > This is because Lucene uses Native Filesystem Locks. The lock file
> > > itself is just a placeholder which is not cleaned up on Ctrl-C. The
> > > lock is not the file itself, its *on* the file.
> > >
> > > -----
> > > Uwe Schindler
> > > H.-H.-Meier-Allee 63, D-28213 Bremen
> > > http://www.thetaphi.de
> > > eMail: uwe@thetaphi.de
> > >
> > > > -----Original Message-----
> > > > From: Pulkit Singhal [mailto:pulkitsinghal@gmail.com]
> > > > Sent: Wednesday, November 10, 2010 3:38 PM
> > > > To: java-user@lucene.apache.org
> > > > Subject: IndexWriters and write locks
> > > >
> > > > Hello,
> > > >
> > > > 1) On Windows, I often shut down my application server (which has
> > > > active IndexWriters open) using the ctrl+c keys.
> > > > 2) I inspect my directories on the file system I see that the
> > > > write.lock
> > > file is still
> > > > there.
> > > > 3) I start the app server again, and do some operations that would
> > > require
> > > > IndexWriters to write to the same directories again and it works!
> > > >
> > > > I don't understand why I do not run into any exceptions?
> > > > I mean there is already a lock file present which should prevent the
> > > > IndexWriters from getting access to the directories ... no?
> > > > I should be happy but I'm not because other folks are able to get
> > > exceptions
> > > > when they bounce their servers an I'm unable to reproduce the
> > > > problem and
> > > I
> > > > can't help them.
> > > >
> > > > Any clues? Anyone?
> > > >
> > > > Thank You,
> > > > - Pulkit
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > > For additional commands, e-mail: java-user-help@lucene.apache.org
> > >
> > >
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message