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From "Sebastian Nagel (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NUTCH-2357) Index metadata throw Exception because writable object cannot be cast to Text
Date Thu, 09 Feb 2017 09:50:41 GMT

    [ https://issues.apache.org/jira/browse/NUTCH-2357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15859272#comment-15859272
] 

Sebastian Nagel commented on NUTCH-2357:
----------------------------------------

Thanks! See also [this discussion on the user mailing list|https://lists.apache.org/thread.html/33996cecba325401837f461eb4c687676a0158665e9a5513cebe7b71@%3Cuser.nutch.apache.org%3E]

Confirmed, minimalistic command to reproduce the problem:
{noformat}
% bin/nutch indexchecker -Dplugin.includes='protocol-http|parse-html|index-metadata' \
       -Dindex.db.md=_rs_ -Dhttp.store.responsetime=true  http://localhost/
...
Exception in thread "main" java.lang.ClassCastException: org.apache.hadoop.io.IntWritable
cannot be cast to org.apache.hadoop.io.Text
        at org.apache.nutch.indexer.metadata.MetadataIndexer.filter(MetadataIndexer.java:58)
{noformat}


> Index metadata throw Exception because writable object cannot be cast to Text
> -----------------------------------------------------------------------------
>
>                 Key: NUTCH-2357
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2357
>             Project: Nutch
>          Issue Type: Bug
>          Components: indexer
>    Affects Versions: 1.12
>         Environment: It was detected using Linux mint 18.
>            Reporter: Eyeris Rodriguez Rueda
>            Priority: Minor
>             Fix For: 1.13
>
>
> Index Metadata plugin use this property(see below), to take keys from Datum and index
it.
> <property>
>   <name>index.db.md</name>
>   <value></value>
>   <description>
> ...
>   </description>
> </property>
> Using any value from this property one Exception is thrown.
> The problem occurs because Writable object can not be cast to Text see this line.
> https://github.com/apache/nutch/blob/master/src/plugin/index-metadata/src/java/org/apache/nutch/indexer/metadata/MetadataIndexer.java#L58
> A little change will fix it.
> This is the Exception:
> **********************************
> 2017-02-06 18:18:29,969 INFO  solr.SolrMappingReader - source: digest dest: digest
> 2017-02-06 18:18:29,969 INFO  solr.SolrMappingReader - source: tstamp dest: tstamp
> 2017-02-06 18:18:29,969 INFO  solr.SolrMappingReader - source: metatag.description dest:
description
> 2017-02-06 18:18:29,969 INFO  solr.SolrMappingReader - source: metatag.keywords dest:
keywords
> 2017-02-06 18:18:30,134 WARN  mapred.LocalJobRunner - job_local15168888_0001
> java.lang.Exception: java.lang.ClassCastException: org.apache.hadoop.io.IntWritable cannot
be cast to org.apache.hadoop.io.Text
> 	at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
> 	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:529)
> Caused by: java.lang.ClassCastException: org.apache.hadoop.io.IntWritable cannot be cast
to org.apache.hadoop.io.Text
> 	at org.apache.nutch.indexer.metadata.MetadataIndexer.filter(MetadataIndexer.java:58)
> 	at org.apache.nutch.indexer.IndexingFilters.filter(IndexingFilters.java:51)
> 	at org.apache.nutch.indexer.IndexerMapReduce.reduce(IndexerMapReduce.java:330)
> 	at org.apache.nutch.indexer.IndexerMapReduce.reduce(IndexerMapReduce.java:56)
> 	at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:444)
> 	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:392)
> 	at org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:319)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:745)
> 2017-02-06 18:18:30,777 ERROR indexer.IndexingJob - Indexer: java.io.IOException: Job
failed!
> 	at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:836)
> 	at org.apache.nutch.indexer.IndexingJob.index(IndexingJob.java:145)
> 	at org.apache.nutch.indexer.IndexingJob.run(IndexingJob.java:228)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> 	at org.apache.nutch.indexer.IndexingJob.main(IndexingJob.java:237)
> ******************************************



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