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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4517) unstable dfs when running jobs on 0.18.1
Date Fri, 24 Oct 2008 19:17:44 GMT
unstable dfs when running jobs on 0.18.1

                 Key: HADOOP-4517
                 URL: https://issues.apache.org/jira/browse/HADOOP-4517
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.18.1
         Environment: hadoop-0.18.1 plus patches HADOOP-4277 HADOOP-4271 HADOOP-4326 HADOOP-4314
            Reporter: Christian Kunz

2 attempts of a job using 6000 maps, 19000 reduces

1.st attempt: failed during reduce phase after 22 hours with 31 dead datanodes most of which
became unresponsive due to an exception; dfs lost blocks
2nd attempt: failed during map phase after 5 hours with 5 dead datanodes due to exception;
dfs lost blocks responsible for job failure.

I will post typical datanode exception and attach thread dump.

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