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https://issues.apache.org/jira/browse/NUTCH-2375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16313503#comment-16313503
]
ASF GitHub Bot commented on NUTCH-2375:
---------------------------------------
Omkar20895 commented on issue #221: NUTCH-2375 Upgrading nutch to use
org.apache.hadoop.mapreduce
URL: https://github.com/apache/nutch/pull/221#issuecomment-355616195
Hello, Apologies for not updating the branch I was on a vacation. I have
updated the PR and now I am getting a NullPointerException and I can't quite
get my head around it.
The Exception comes when I run the command : runtime/deploy/bin/nutch
generate crawl/crawldb crawl/segments
The exception :
Error: java.lang.NullPointerException
at
org.apache.nutch.crawl.URLPartitioner.getPartition(URLPartitioner.java:75)
at
org.apache.nutch.crawl.URLPartitioner.getPartition(URLPartitioner.java:39)
at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:715)
at
org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
at
org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.write(WrappedMapper.java:112)
at
org.apache.nutch.crawl.Generator$SelectorInverseMapper.map(Generator.java:538)
at
org.apache.nutch.crawl.Generator$SelectorInverseMapper.map(Generator.java:531)
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:164)
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:1657)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
The exception occurs only in pseudo-distributed mode, the code looks fine
and I do not understand the reason for this exception. I think this has
something to do with execution in distributed mode of hadoop. @sebastian-nagel
@lewismc please suggest me some reasons of why this might be happening so that
I can work in it. Thanks.
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> Upgrade the code base from org.apache.hadoop.mapred to
> org.apache.hadoop.mapreduce
> ----------------------------------------------------------------------------------
>
> Key: NUTCH-2375
> URL: https://issues.apache.org/jira/browse/NUTCH-2375
> Project: Nutch
> Issue Type: Improvement
> Components: deployment
> Affects Versions: 1.13
> Reporter: Omkar Reddy
> Fix For: 1.15
>
>
> Nutch is still using the deprecated org.apache.hadoop.mapred dependency which
> has been deprecated. It need to be updated to org.apache.hadoop.mapreduce
> dependency.
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