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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: Index "corruption" makes it return a different result
Date Wed, 26 Mar 2008 18:32:37 GMT

OK I think I follow now.

Which version of Lucene was this?

If it's not too large, can you post the CFS file that got mixed up?   
Be sure to cc me directly on the mail because the mailing list  
software removes attachments.

Mike

Lucas F. A. Teixeira wrote:
> This is just one of the index files.
>
> As I said, the local disk where the index is generated, it's not  
> full, the full disk it's the shared storage where my application  
> server store its logs.
> When this disk hitted 100%, all the indexing process stop (of  
> course, all the processing instances of this managed server stopped).
>
> The "thing" is that the index was not corrupted, one of the index  
> files has these log messages from my application server inside it,  
> problably a JVM problem on mixing two IO buffers when one of them  
> coudn't flush (the logs partition). For me it would be normal if it  
> causes index corruption... :-)
>
> The second and most weird thing it's that my clients application  
> just read the index, and did some queries on it, always returning  
> different (but consistent) results.
>
> I tried to edit the index file, and remove the application server  
> logs that was inside it, and after that?? Index Corrupted  
> Exception! :-)
>
> Wow!
>
> I think this issue involves more stuff than just lucene... I had  
> some problems in my JVM IO buffer handling of course. But my point 
> (s) is the both above... ;-)
>
> []s,
>
> Lucas
>
>
>
>
> Michael McCandless wrote:
>>
>> I couldn't quite follow the part about "_al1.cfs".
>>
>> It sounds like your indexing process hit a disk full event, that  
>> led to this error? Can you post the full exception(s) from the  
>> disk full?
>>
>> Which version of Lucene are you using?
>>
>> Mike
>>
>> Lucas F. A. Teixeira wrote:
>>> Hello all!
>>>
>>> I had a problem this week, and I like to share with you all.
>>> My weblogic server that generate my index hrows its logs in a  
>>> shared storage. During my indexing process (SOLR+Lucene), this  
>>> shared storage became 100% full, and everything collapsed (all  
>>> servers that uses this shared storage). But my index (that is  
>>> generated in the local filesystem, just "grabbed" some logs of  
>>> the server (who knows weblogic knows the managed server  
>>> accesslog, that's the guy) from the buffer (my supposition), and  
>>> put inside my index files! Take a look how my "_al1.cfs" became  
>>> between some binary parts of the file:
>>>
>>> 2008-03-19    -    02:31:03    -    [ip]    -    POST    -     
>>> 200    -    /AcomProductSyncServiceWeb/AcomProductSyncService
>>> 2008-03-19    -    02:31:03    -    [ip]    -    POST    -     
>>> 200    -    /AcomProductSyncServiceWeb/AcomProductSyncService
>>> 2008-03-19    -    02:31:04    -    [ip]    -    POST    -     
>>> 200    -    /AcomProductSyncServiceWeb/AcomProductSyncService
>>> 2008-03-19    -    02:31:04    -    [ip]    -    POST    -     
>>> 200    -    /AcomProductSyncServiceWeb/AcomProductSyncService
>>> 2008-03-19    -    02:31:04    -    [ip]    -    POST    -     
>>> 200    -    /AcomProductSyncServiceWeb/AcomProductSyncService
>>>
>>> The most incredible thing, is that I can open the index without a  
>>> CorruptedIndexException, normally. That's really bad for me,  
>>> cause the application didn't warn about a corrupted index (of  
>>> course, it is not). I can open it with the Luke App, and with  
>>> this simple code snippet accessing directly the lucene index  
>>> without solr:
>>>
>>>        IndexReader indexReader = IndexReader.open 
>>> (FSDirectory.getDirectory("C/index/index.2008-03-19"));
>>>        IndexSearcher indexSearcher = new IndexSearcher(indexReader);
>>>              TermQuery termQuery = new TermQuery(new Term 
>>> ("itemId", "680804"));
>>>        Hits hits = indexSearcher.search(termQuery);
>>>              Iterator itHits = hits.iterator();
>>>        while (itHits.hasNext()) {
>>>            Hit hit = (Hit) itHits.next();
>>>            Document document = hit.getDocument();
>>>            String itemId = document.getField("itemId").stringValue 
>>> ();
>>>            System.out.println("itemId="+itemId);
>>>        }
>>>              indexSearcher.close();
>>>        indexReader.close();
>>>
>>>
>>> Ok, ok. But, if it's opening, whats my real problem?  Making this  
>>> little search above, the Document that I got, was another one,  
>>> with other information different from the original one that I was  
>>> looking for (the one with the itemId field = 680804). The whole  
>>> document was another document (but a valid document, that I've  
>>> indexed before). The itemId value that I got, the one that was  
>>> printed from that application above was 578340. Wow!!
>>>
>>> I can reproduce this error anytime with this code or with luke on  
>>> this corrupted index, but was terrible for me to find the exact  
>>> point of this fault.
>>>
>>> I've reindexed everything, it solves my problem. But I wants to  
>>> know if someone have any idea why this happened...
>>>
>>> Thanks people!
>>>
>>> []s,
>>>
>>> Lucas Teixeira
>>> lucas.teixeira@accurate.com.br
>>>
>>>
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>>
>>
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>>
>>
>
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