[ 
http://issues.apache.org/jira/browse/NUTCH-117?page=comments#action_12363898 ] 

Mike Alulin commented on NUTCH-117:
-----------------------------------

I have same issue in my new production system, although same code works on dev 
and old production without any problems. 

The solution for this bug is uncommenting "pageDb.close();" in the 
WebDBWriter.java file. Otherwise the reader locks the webdb.new\pagesByURL\data 
file and it cannot be deleted sometimes.

> Crawl crashes with java.io.IOException: already exists: 
> C:\nutch\crawl.intranet\oct18\db\webdb.new\pagesByURL
> -------------------------------------------------------------------------------------------------------------
>
>          Key: NUTCH-117
>          URL: http://issues.apache.org/jira/browse/NUTCH-117
>      Project: Nutch
>         Type: Bug
>     Versions: 0.7, 0.6, 0.7.1
>  Environment: Window 2000  P4 1.70GHz 512MB RAM
> Java 1.5.0_05
>     Reporter: Stephen Cross
>     Priority: Critical

>
> I started a crawl using the command line using nutch 0.7.1.
> nutch-daemon.sh start crawl urls.txt -dir oct18 -threads 4 -depth 20
> After crawling for over 15 hours the crawl crached with the following 
> exception:
> 051019 050543 status: segment 20051019050438, 30 pages, 0 errors, 1589818 
> bytes, 48020 ms
> 051019 050543 status: 0.6247397 pages/s, 258.65167 kb/s, 52993.934 bytes/page
> 051019 050544 Updating C:\nutch\crawl.intranet\oct18\db
> 051019 050544 Updating for 
> C:\nutch\crawl.intranet\oct18\segments\20051019050438
> 051019 050544 Processing document 0
> 051019 050544 Finishing update
> 051019 050544 Processing pagesByURL: Sorted 47 instructions in 0.02 seconds.
> 051019 050544 Processing pagesByURL: Sorted 2350.0 instructions/second
> Exception in thread "main" java.io.IOException: already exists: 
> C:\nutch\crawl.intranet\oct18\db\webdb.new\pagesByURL
>         at org.apache.nutch.io.MapFile$Writer.<init>(MapFile.java:86)
>         at 
> org.apache.nutch.db.WebDBWriter$CloseProcessor.closeDown(WebDBWriter.java:549)
>         at org.apache.nutch.db.WebDBWriter.close(WebDBWriter.java:1544)
>         at 
> org.apache.nutch.tools.UpdateDatabaseTool.close(UpdateDatabaseTool.java:321)
>         at 
> org.apache.nutch.tools.UpdateDatabaseTool.main(UpdateDatabaseTool.java:371)
>         at org.apache.nutch.tools.CrawlTool.main(CrawlTool.java:141)
> This was on the 14th segement from the requested depth of 20. Doing a quick 
> Google on the exception brings up a few previous posts with the same error 
> but no definitive answer, seems to have been occuring since nutch 0.6.

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