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From Scott Ganyo <>
Subject Re: Bad file number
Date Mon, 10 Nov 2003 14:48:30 GMT
I don't think adding extensive locking is necessary.  What you are 
probably experiencing is that you've closed the index before you're done 
using it.  If you aren't careful to close the index only after all 
searches on it have been completed, you'll get an error like this.

Scott wrote:

>I'm trying to debug a problem with a lucene installation which is getting
>" Bad file number" occasionally when performing
>searches.  More specifically, the exception is coming when we are using a
>Reader to extract the "hit" Documents from the index (due to using
>getMessage instead of printStackTrace, I can't tell for sure if the
>exception is coming from opening the reader, or getting the
>I believe this problem is because of our design, which is that we allow
>ongoing multiple searches, and every 30 seconds we have a separate program
>which performs updates (adding and deleting documents) on the same index
>that is being searched.  After a batch of updates are performed we close
>and re-open the IndexSearcher, the idea being that it should now be able to
>access the new documents.
>Is this a situation where we should have some locking in place that has
>searches wait while documents are being added/deleted?  This would be easy
>enough to implement, but there is a lot of updating to do, and we don't
>want to sacrifice the excellent performance of the search by waiting every
>30 seconds while updates happen.  We've thought of two basic paths to take:
>1.  Implement a locking mechanism, and maybe try to add/delete one document
>each time the updating program aquires the lock, instead of a bigger batch.
>We think this might keep the search waiting the least amount of time, but
>updates will take longer.
>2.  Use a scheme with 2 indexes where we always update the one that isn't
>being searched in, and switch between the two.  We are not sure if it makes
>sense to perform the switch every 30 seconds in this case.
>Does anyone have an idea if I am correct about the cause of the Exception,
>or any thoughts on the two possible solutions?  We are running jdk 1.4, and
>lucene 1.2 on solaris.
>Thanks for any help you can give.
>Brad Hendricks
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