[NUTCH-2357] Index metadata throw Exception because writable object cannot be cast to Text

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.12
• Fix Version/s: 1.13
• Component/s: indexer

Environment

It was detected using Linux mint 18.

• Patch Info: Patch Available
• Flags: Patch
• Assignee: Chris A. Mattmann
• Reporter: Eyeris Rodriguez Rueda
• Created: 07/Feb/17 13:53
• Updated: 13/Mar/24 14:51
• Resolved: 14/Mar/17 23:20

Description

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)
******************************************

Issue Links

• links to: GitHub Pull Request #177