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https://issues.apache.org/jira/browse/NUTCH-972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabriele Kahlout updated NUTCH-972:
-----------------------------------
Attachment: check_empty.diff
> Mergedb doesn't merge with empty directory, as is the case with merge (for
> indexes)
> -----------------------------------------------------------------------------------
>
> Key: NUTCH-972
> URL: https://issues.apache.org/jira/browse/NUTCH-972
> Project: Nutch
> Issue Type: Bug
> Components: storage
> Affects Versions: 1.2
> Reporter: Gabriele Kahlout
> Priority: Minor
> Labels: patch
> Fix For: 1.3
>
> Attachments: check_empty.diff
>
>
> Just an issue of unexpected behavior. This series of commands works with
> bin/nutch merge to merge indexes but not with crawldb.
> allcrawldb="crawl/allcrawldb"
> temp_crawldb="crawl/temp_crawldb"
> merge_dbs="$it_crawldb $allcrawldb"
>
> # if [[ ! -d $allcrawldb ]]
> # then
> # merge_dbs="$it_crawldb"
> # fi
> # uncomment the above and mergedb will work fine.
> bin/nutch mergedb $temp_crawldb $merge_dbs
> rm -r $it_crawldb $allcrawldb crawl/segments crawl/linkdb
> mv $temp_crawldb $allcrawldb
> This is the exception that occurs:
> bin/nutch mergedb crawl/temp_crawldb crawl/crawldb crawl/allcrawldb
> CrawlDb merge: starting at 2011-03-27 10:13:06
> Adding crawl/crawldb
> Adding crawl/allcrawldb
> CrawlDb merge: org.apache.hadoop.mapred.InvalidInputException: Input path
> does not exist: file:/Users/simpatico/nutch-1.2/crawl/allcrawldb/current
> at
> org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:190)
> at
> org.apache.hadoop.mapred.SequenceFileInputFormat.listStatus(SequenceFileInputFormat.java:44)
> at
> org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:201)
> at org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:810)
> at
> org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:781)
> at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:730)
> at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1249)
> at org.apache.nutch.crawl.CrawlDbMerger.merge(CrawlDbMerger.java:126)
> at org.apache.nutch.crawl.CrawlDbMerger.run(CrawlDbMerger.java:187)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> at org.apache.nutch.crawl.CrawlDbMerger.main(CrawlDbMerger.java:159)
> Beside the scripting workaround I've attached a patch which skips adding the
> empty folder to the collection of dbs to merge. I've also added it a log of
> which dbs actually get added, consistent with merge interface.
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