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https://issues.apache.org/jira/browse/NUTCH-2354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292630#comment-16292630
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ASF GitHub Bot commented on NUTCH-2354:
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sebastian-nagel opened a new pull request #261: NUTCH-2354 Upgrade Hadoop
dependencies to 2.7.4
URL: https://github.com/apache/nutch/pull/261
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> Upgrade Hadoop dependencies to 2.7.3
> ------------------------------------
>
> Key: NUTCH-2354
> URL: https://issues.apache.org/jira/browse/NUTCH-2354
> Project: Nutch
> Issue Type: Bug
> Components: injector
> Affects Versions: 1.12
> Reporter: Markus Jelsma
> Assignee: Markus Jelsma
> Priority: Blocker
> Fix For: 1.14
>
>
> This wednesday we experienced trouble running the 1.12 injector on Hadoop
> 2.7.3. We operated 2.7.2 before and we had no trouble running a job.
> {code}
> 2017-01-18 15:36:53,005 FATAL [main] org.apache.hadoop.mapred.YarnChild:
> Error running child : java.lang.IncompatibleClassChangeError: Found interface
> org.apache.hadoop.mapreduce.Counter, but class was expected
> at org.apache.nutch.crawl.Injector$InjectMapper.map(Injector.java:216)
> at org.apache.nutch.crawl.Injector$InjectMapper.map(Injector.java:100)
> 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:1698)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
> Exception in thread "main" java.lang.IncompatibleClassChangeError: Found
> interface org.apache.hadoop.mapreduce.Counter, but class was expected
> at org.apache.nutch.crawl.Injector.inject(Injector.java:383)
> at org.apache.nutch.crawl.Injector.run(Injector.java:467)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at org.apache.nutch.crawl.Injector.main(Injector.java:441)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
> {code}
> Our processes retried injecting for a few minutes until we manually shut it
> down. Meanwhile on HDFS, our CrawlDB was gone, thanks for snapshots and/or
> backups we could restore it, so enable those if you haven't done so yet.
> These freak Hadoop errors can be notoriously difficult to debug but it seems
> we are in luck, recompile Nutch with Hadoop 2.7.3 instead 2.4.0. You are also
> in luck if your job file uses the old org.hadoop.mapred.* API, only jobs
> using the org.hadoop.mapreduce.* API seem to fail.
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