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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-96) name server should log decisions that affect data: block creation, removal, replication
Date Fri, 05 May 2006 00:19:18 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-96?page=all ]

Hairong Kuang updated HADOOP-96:
--------------------------------

    Attachment: namenodeLogging.patch

The Cygwin problem is solved.

> 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: 0.1.0
>     Reporter: Yoram Arnon
>     Assignee: Hairong Kuang
>     Priority: Critical
>      Fix For: 0.2
>  Attachments: namenodeLogging.patch, namenodeLogging.patch, namenodeLogging.patch
>
> 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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