Hans Brende created NUTCH-2551:
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Summary: NullPointerException in generator
Key: NUTCH-2551
URL: https://issues.apache.org/jira/browse/NUTCH-2551
Project: Nutch
Issue Type: Bug
Components: generator
Affects Versions: 1.15
Reporter: Hans Brende
Fix For: 1.15
A NullPointerException is thrown during the crawl generate stage when I deploy
to a hadoop cluster (but for some reason, it works fine locally).
It looks like this is caused because the URLPartitioner class still has the old
{{configure()}} method in there (which is never called, causing the
{{normalizers}} field to remain null), rather than implementing the
{{Configurable}} interface as detailed in the newer mapreduce API's Partitioner
spec.
Stack trace:
{code}
java.lang.NullPointerException
at org.apache.nutch.crawl.URLPartitioner.getPartition(URLPartitioner.java:76)
at org.apache.nutch.crawl.URLPartitioner.getPartition(URLPartitioner.java:40)
at org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:716)
at
org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
at
org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.write(WrappedMapper.java:112)
at
org.apache.nutch.crawl.Generator$SelectorInverseMapper.map(Generator.java:553)
at
org.apache.nutch.crawl.Generator$SelectorInverseMapper.map(Generator.java:546)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:175)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1836)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:169)
{code}
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