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From Dmitry Serebrennikov <>
Subject Re: Index locked for write
Date Sun, 05 Oct 2003 20:04:55 GMT
No one seems to have responded to this yet, so I'll give a first shot. 
There were a few changes that I am aware of that occured in the locking 
area. One of Lucene's locking rules is that IndexWriter cannot co-exist 
with an "deleting" IndexReader. An IndexReader becomes "deleting" when 
delete method is called on it. If one of these exists, trying to open 
the other one will cause the exception you are observing (I believe). 
The changes in this area were in tightening the logic enforcing this 
rule. There were a couple of test cases submitted, 
I believe, that illustrated two conditions that were not handled 
properly in the old code. They are now handled correctly, but there is 
still an open issue regarding the timestamp resolution in Mac OSX that 
uses an older filesytem (I'm not a Mac user myself, so I don't know what 
that file system is called). Apparently that filesystem can only resolve 
timestamps up to a second, so the locking logic, which is based on the 
file timestamps, can fail. The same failure can (and does) also occur on 
other filesystems, but it would occur on Mac more often. Again, try the 
test case. Apparently one of the two test cases still fails on Mac OSX.

If you search for Mac in the last week of the traffic on this list you 
will find more information about this issue and some suggested fixes. 
There was also a discussion about which of the multiple proposed evils 
would be better, but there is still no resolution to this issue.

Good luck.

P.S.: it might be helpful if you include a more complete stack trace of 
the exception you are seeng, such that it would show what operations are 
being attempted when the failure occurs.

petite_abeille wrote:

> Hello,
> I recently updated from 1.3 RC1 to the latest cvs version. RC1 has 
> proven very reliable for me, but I needed Dmitry compound index 
> functionality. Therefore the move to the cvs version.
> I have been using 1.3 RC1 without any problem. But... since updating 
> to the cvs version, I'm getting a lot of apparently random IOException 
> related to locking:
> Index locked for write: 
> Lock@/tmp/lucene-5b228139f8fe55f7c74441a7d59f8f89-write.lock
>         at 
> org.apache.lucene.index.IndexWriter.<init>(
>         at 
> org.apache.lucene.index.IndexWriter.<init>(
> This is most likely due to some problem on my side, but for the life 
> of me I cannot track it down nor reproduce it :(
> Also, the only change related to Lucene on my side was the update from 
> 1.3 RC1 to the cvs version. Perhaps this has triggered a "dormant" bug 
> in my app. Or perhaps something has changed in the cvs version which 
> impact me negatively. Other way, I'm at loss.
> My guess would be that this is most likely a threading issue. On my 
> side, I use a very conservative threading which supposedly 
> synchronized any access to Lucene. And this hasn't changed for a good 
> while.
> Any idea where I should look in such a situation? Any "significant" 
> changes related to locking on Lucene side?
> For the record, this problem seems to mostly manifest itself under Mac 
> OS X, running Java 1.4.1_01.
> Thanks.
> Cheers,
> PA.
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