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Posted to dev@nutch.apache.org by "Nick Jacobsen (JIRA)" <ji...@apache.org> on 2005/10/21 18:10:21 UTC
[jira] Commented: (NUTCH-117) Crawl crashes with java.io.IOException: already exists: C:\nutch\crawl.intranet\oct18\db\webdb.new\pagesByURL
[ http://issues.apache.org/jira/browse/NUTCH-117?page=comments#action_12332720 ]
Nick Jacobsen commented on NUTCH-117:
-------------------------------------
I had a similar issue, and it seems (guessing here) to be related to some sort of race condition on filehandles. I was running the nutch crawler while doing some heavy processing (compiling java on OpenBSD in a virtual machine), and 19 out of 20 times, nutch would crash with that or a similar error - always related to some sort of file not found, and sometimes access denied. As soon as I stopped doing heavy processing, my nutch errors went down to 1 out of every 20 runs.
Based on this, I have come to the above conslusion that it is some sort of file handle race condition - also, for those of you wondering, it did not matter if I was running 1 or 30 threads, I had the same problems.
Hope this helps a little.
> 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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