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Subject: Re: Lucene index reset/cleared after an unexpected powerdown - advice
 please
To: user@lucenenet.apache.org, mark.cranness@orcon.net.nz
References: <004301d0fffc$68db5330$3a91f990$@orcon.net.nz>
From: Simon Svensson <sisve@devhost.se>
Message-ID: <5614A096.2050208@devhost.se>
Date: Wed, 7 Oct 2015 06:33:26 +0200
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Hi,

I believe that this would be due to
https://issues.apache.org/jira/browse/LUCENE-3418 assuming that
Lucene.Net has the exact same behavior as Lucene 3.0.3.

// Simon


On 06/10/15 08:01, Mark Cranness wrote:
> Hi All,
> 
> Re: Lucene index reset/cleared after an unexpected powerdown - advice please
> 
> A client site had an unexpected powerdown (and UPS failure), after which the Lucene index was empty or corrupted and has
> lost its documents.
> Users continued to work and add new documents, and the index now only contains those new documents.
> 
> The index files (after the crash) only add up to about 78KB (for 30 new documents), so it looks like there is nothing
> left of the old index.
> 
> Our logging shows the last writer.UpdateDocument 8 minutes before the crash.
> Our code Commits the index writer after each document update.
> So the index should have been synced to disk
> 
> There is evidence against the possibility that a document update was in progress at the time of the crash, but was not
> logged because the log was not flushed.
> 
> A bit of a long-shot, but does anybody have any advice on how to debug the truncation/clearing of the Lucene index?
> 
> 
> Details:
> Lucene.Net 3.0.3.0
> 
> Index is a Lucene.Net.Store.FSDirectory
> _directory = FSDirectory.Open(new DirectoryInfo(luceneDir), new SingleInstanceLockFactory());
> 
> There is only one single (static) instance of the IndexWriter
> _writer = new IndexWriter(_directory, analyzer, IndexWriter.MaxFieldLength.UNLIMITED);
> 
> .NET 4.5
> 
> Thanks,
> Mark
> 
>