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https://issues.apache.org/jira/browse/NUTCH-1299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Markus Jelsma resolved NUTCH-1299.
----------------------------------
Resolution: Fixed
Superfluous records are now ignored but a WARN message is written to the log.
Committed for 1.5 in rev. 1297586.
> LinkRank inverter to ignore records without Node
> ------------------------------------------------
>
> Key: NUTCH-1299
> URL: https://issues.apache.org/jira/browse/NUTCH-1299
> Project: Nutch
> Issue Type: Bug
> Affects Versions: 1.4
> Reporter: Markus Jelsma
> Assignee: Markus Jelsma
> Fix For: 1.5
>
> Attachments: NUTCH-1299-1.5-1.patch, NUTCH-1299-1.5-2.patch
>
>
> No Node object is passed from the inverter's mapper to the reducer, which
> expects one, causing the following exception:
> {code}
> java.lang.NullPointerException
> at
> org.apache.nutch.scoring.webgraph.LinkRank$Inverter.reduce(LinkRank.java:409)
> at
> org.apache.nutch.scoring.webgraph.LinkRank$Inverter.reduce(LinkRank.java:356)
> at
> org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:519)
> at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:420)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:396)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1083)
> at org.apache.hadoop.mapred.Child.main(Child.java:249)
> {code}
> This never happens unless you have a funky web graph. Our web graph changes
> frequently, adding and deleting records. It's likely a large number of
> records deleted from the outlink database is responsible for this. This
> error, however, only showed up now, a great deal of time after we began
> deleting records.
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