[NUTCH-2719] NPE if exchanges.xml uses index writer not available

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.15
• Fix Version/s: 1.16
• Component/s: indexer
• Assignee: Roannel Fernández Hernández
• Reporter: Sebastian Nagel
• Created: 22/May/19 15:03
• Updated: 28/Jan/21 13:56
• Resolved: 01/Sep/19 04:53

Description

If the exchanges.xml uses an index writer not present (e.g., because the plugin is not in plugin.includes) the index job fails with a NPE:

java.lang.Exception: java.lang.NullPointerException
        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.NullPointerException
        at org.apache.nutch.indexer.IndexWriters.write(IndexWriters.java:222)
        at org.apache.nutch.indexer.IndexerOutputFormat$1.write(IndexerOutputFormat.java:62)
        at org.apache.nutch.indexer.IndexerOutputFormat$1.write(IndexerOutputFormat.java:47)
        at org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:558)

This should be caught gracefully with a message about an inconsistent configuration.

Issue Links

• links to: GitHub Pull Request #465