[ http://issues.apache.org/jira/browse/HADOOP-96?page=all ]
Doug Cutting resolved HADOOP-96:
--------------------------------
Resolution: Fixed
I just committed this.
I made one additional change. You removed the 'cd $HADOOP_HOME' line in
hadoop-daemon.sh. I re-added this to hadoop-daemons.sh, so that, when starting
remote daemons, they are always run from HADOOP_HOME rather than the users home
directory, which is more likely to be NFS mounted. The CWD of a daemon is used
for core dumps, java profiler output, etc. and it is generally best if it is
not NFS mounted.
Thanks, Hairong!
> 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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