Mergedb doesn't merge with empty directory, as is the case with merge (for
indexes)
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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
Fix For: 1.3
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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