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From "Yoram Arnon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-96) name server should log decisions that affect data: block creation, removal, replication
Date Tue, 21 Mar 2006 17:10:02 GMT
name server should log decisions that affect data: block creation, removal, replication
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         Key: HADOOP-96
         URL: http://issues.apache.org/jira/browse/HADOOP-96
     Project: Hadoop
        Type: Improvement
  Components: dfs  
    Versions: 0.1    
    Reporter: Yoram Arnon
    Priority: Critical


currently, there's no way to analyze and debug DFS errors where blocks disapear.
name server should log its decisions that affect data, including block creation, removal,
replication:
- block <b> created, assigned to datanodes A, B, ...
- datanode A dead, block <b> underreplicated(1), replicating to datanode C
- datanode B dead, block <b> underreplicated(2), replicating to datanode D
- datanode A alive, block <b> overreplicated, removing from datanode D
- block <removed> from datanodes C, D, ...

that will enable me to track down, two weeks later, a block that's missing from a file, and
to debug the name server.

extra credit:
- rotate log file, as it might grow large
- make this behaviour optional/configurable

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