Markus Jelsma created NUTCH-3109:
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Summary: Unable to update CrawlDB due to URL normalization
Key: NUTCH-3109
URL: https://issues.apache.org/jira/browse/NUTCH-3109
Project: Nutch
Issue Type: Bug
Reporter: Markus Jelsma
I routinely added new normalization rules in a custom normalizer plugin,
nothing out of the ordinary. Updating the CrawlDB with -normalize just got me
this:
{code:java}
2025-03-24 08:01:23,166 ERROR [main] org.apache.hadoop.mapred.YarnChild: Error
running child : java.lang.AbstractMethodError: Receiver class
java.lang.ArrayIndexOutOfBoundsException does not define or inherit an
implementation of the resolved method 'java.lang.String toString()' of class
java.lang.Object.
at java.base/java.lang.String.valueOf(String.java:2951)
at java.base/java.lang.StringBuilder.append(StringBuilder.java:172)
at org.apache.nutch.crawl.CrawlDbFilter.map(CrawlDbFilter.java:101)
at org.apache.nutch.crawl.CrawlDbFilter.map(CrawlDbFilter.java:37)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:800)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:348)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:178)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1899)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:172) {code}
The offending line of code is the LOG.warn below:
{code:java}
if (url != null && urlNormalizers) {
try {
url = normalizers.normalize(url, scope); // normalize the url
} catch (Exception e) {
LOG.warn("Skipping " + url + ":" + e);
url = null;
} {code}
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