[ https://issues.apache.org/jira/browse/NUTCH-2474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sebastian Nagel resolved NUTCH-2474. ------------------------------------ Resolution: Fixed Assignee: Sebastian Nagel > 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 > Assignee: 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)