nutch java.io.IOException: lock file crawl/.locked already e_nutch吧

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nutch java.io.IOException: lock file crawl/.locked already e

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CrawlDb update: java.io.IOException: lock file crawl/.locked already exists.
at org.apache.nutch.util.LockUtil.createLockFile(LockUtil.java:50)
at org.apache.nutch.crawl.CrawlDb.update(CrawlDb.java:76)
at org.apache.nutch.crawl.CrawlDb.run(CrawlDb.java:246)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.nutch.crawl.CrawlDb.main(CrawlDb.java:196)
怎么回事啊？

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