Sebastian Nagel created NUTCH-2474:
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Summary: CrawlDbReader -stats fails with ClassCastException
Key: NUTCH-2474
URL: https://issues.apache.org/jira/browse/NUTCH-2474
Project: Nutch
Issue Type: Bug
Components: crawldb
Affects Versions: 1.14
Environment: Java 8, distributed mode: Hadoop CDH 5.13.0
Reporter: Sebastian Nagel
Priority: Critical
Fix For: 1.14
In distributed mode CrawlDbReader / readdb -stats fails with a
ClassCastException in the combiner:
{noformat}
17/12/08 04:57:13 INFO mapreduce.Job: Task Id :
attempt_1512553291624_0022_m_000039_0, Status : FAILED
Error: java.lang.ClassCastException: org.apache.hadoop.io.FloatWritable cannot
be cast to org.apache.hadoop.io.LongWritable
at
org.apache.nutch.crawl.CrawlDbReader$CrawlDbStatCombiner.reduce(CrawlDbReader.java:296)
at
org.apache.nutch.crawl.CrawlDbReader$CrawlDbStatCombiner.reduce(CrawlDbReader.java:222)
at
org.apache.hadoop.mapred.Task$OldCombinerRunner.combine(Task.java:1639)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.mergeParts(MapTask.java:1946)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:1514)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:466)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
{noformat}
FloatWritables are used since NUTCH-2470, so that's when this bug was
introduced.
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