[ http://issues.apache.org/jira/browse/HADOOP-96?page=all ]
Yoram Arnon reassigned HADOOP-96:
---------------------------------
Assign To: Hairong Kuang
> name server should log decisions that affect data: block creation, removal,
> replication
> ---------------------------------------------------------------------------------------
>
> Key: HADOOP-96
> URL: http://issues.apache.org/jira/browse/HADOOP-96
> Project: Hadoop
> Type: Improvement
> Components: dfs
> Versions: 0.1
> Reporter: Yoram Arnon
> Assignee: Hairong Kuang
> 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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