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https://issues.apache.org/jira/browse/HADOOP-6610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HADOOP-6610:
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Fix Version/s: (was: 2.8.0)
> Hadoop conf/ servlet improvements
> ---------------------------------
>
> Key: HADOOP-6610
> URL: https://issues.apache.org/jira/browse/HADOOP-6610
> Project: Hadoop Common
> Issue Type: Improvement
> Components: conf
> Affects Versions: 0.22.0
> Reporter: Steve Loughran
> Priority: Minor
>
> I'm playing with the conf/ servlet, trying to do a workflow that
> # pulls down the conf servlet from a well known URL (this is trickier when
> your VMs are dynamic, but possible)
> # saves it locally, using {{<get>}} task
> # {{<get>}} some info on the machines in the allocated cluster, like their
> external hostnames
> # SCP in the configuration files, JAR files needed to submit work,
> # submit work via SSH
> I have to SSH as the VMs have different internal/external addresses; HDFS
> gets upset.
> Some issues I've found so far
> # It's good to set expires headers on everything; HADOOP-6607 covers that
> # Having sorted conf values makes it easier to locate properties, otherwise
> you have to save it to a text editor and search around
> # the <!-- Loaded from Unknown --> option makes things noisy
> # Saving as a java.util.Properties would let me pull these things into a
> build file or other tool very easily. This is easy to test too.
> # Have a comment at the top listing when the conf was generated, and the
> hostname. Maybe even make them conf values
> More tricky is the conf options that are dynamic, things like
> {code}
> <property><!--Loaded from
> Unknown--><name>dfs.datanode.address</name><value>0.0.0.0:0</value></property>
> {code}
> These show what the node was started with, not what it actually got. I am
> doing a workaround there with my code (setting the actual values in the conf
> file with {{live.dfs.datanode.address}}, etc, and extracting them that way. I
> don't want to lose the original values, but do want the real ones
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