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From "Markus Jelsma (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (NUTCH-1299) NPE in LinkRank inverter
Date Tue, 06 Mar 2012 12:18:57 GMT

     [ 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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