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Posted to dev@nutch.apache.org by "Markus Jelsma (Updated) (JIRA)" <ji...@apache.org> on 2012/03/06 13:18:57 UTC
[jira] [Updated] (NUTCH-1299) NPE in LinkRank inverter
[ https://issues.apache.org/jira/browse/NUTCH-1299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Markus Jelsma updated NUTCH-1299:
---------------------------------
Patch Info: Patch Available
> 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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