[NUTCH-2597] NPE in updatehostdb

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.15
• Fix Version/s: 1.15
• Component/s: hostdb
• Assignee: Unassigned
• Reporter: Jurian Broertjes
• Created: 13/Jun/18 10:57
• Updated: 01/Oct/19 14:29
• Resolved: 21/Jun/18 14:38

Description

I get an NPE on updatehostdb. I start with a clean crawlDB & hostDB. After an inject, I do an updatehostdb with -checkAll and get the following stacktrace:

2018-06-13 10:45:21,958 WARN hostdb.ResolverThread - java.lang.NullPointerException
 at org.apache.hadoop.io.SequenceFile$Writer.checkAndWriteSync(SequenceFile.java:1359)
 at org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:1400)
 at org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat$1.write(SequenceFileOutputFormat.java:83)
 at org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:558)
 at org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
 at org.apache.hadoop.mapreduce.lib.reduce.WrappedReducer$Context.write(WrappedReducer.java:105)
 at org.apache.nutch.hostdb.ResolverThread.run(ResolverThread.java:82)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)

Is this related to NUTCH-2375?

If further testing is needed, please let me know!

Issue Links

• is caused by: NUTCH-2375 Upgrade the code base from org.apache.hadoop.mapred to org.apache.hadoop.mapreduce
• links to: GitHub Pull Request #349