NPE in LinkRank inverter
------------------------
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
Priority: Critical
Fix For: 1.5
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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