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Posted to dev@nutch.apache.org by "Sebastian Nagel (JIRA)" <ji...@apache.org> on 2017/12/14 14:58:00 UTC
[jira] [Commented] (NUTCH-2354) Upgrade Hadoop dependencies to
2.7.3
[ https://issues.apache.org/jira/browse/NUTCH-2354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290939#comment-16290939 ]
Sebastian Nagel commented on NUTCH-2354:
----------------------------------------
[~markus17], the issue is marked as "blocker": shall we include this (upgrade to 2.7.4 which is the latest release on 2.7) into the release of 1.14?
> 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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