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https://issues.apache.org/jira/browse/WHIRR-52?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883409#action_12883409
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Jeff Hammerbacher commented on WHIRR-52:
----------------------------------------
Wow, seeing some potentially weird behavior from Rackspace.
In {{HadoopService.java}}, I've instrumented the system with my highly complex
debugging tool:
{code}
NodeMetadata node = Iterables.getOnlyElement(nodes);
InetAddress namenodePublicAddress =
Iterables.getOnlyElement(node.getPublicAddresses());
System.out.println("NN: " + namenodePublicAddress);
System.out.println("NN hostname: " + namenodePublicAddress.getHostName());
InetAddress jobtrackerPublicAddress =
Iterables.getOnlyElement(node.getPublicAddresses());
System.out.println("JT: " + jobtrackerPublicAddress);
System.out.println("JT hostname: " + jobtrackerPublicAddress.getHostName());
{code}
Here's the output:
{noformat}
NN: /184.106.196.148
NN hostname: 184-106-196-148.static.cloud-ips.com
JT: 184-106-196-148.static.cloud-ips.com/184.106.196.148
JT hostname: 184-106-196-148.static.cloud-ips.com
{noformat}
It seems that a call to {{.getHostName()}} is altering the state of the
{{node}} object such that the second call to {{.getPublicAddresses()}} is
different from the first. Perhaps that's known behavior, but I'm just recording
my investigations here for posterity.
On the other hand, {{mapred.job.tracker}} is set using the {{.getHostName()}}
call, and the result of that call seems constant and reasonable, so I'm not
quite sure where things are going wrong. More sophisticated debugging awaits...
> Allow a Hadoop MapReduce job to be run against a Hadoop Service running on
> Rackspace Cloud Servers
> --------------------------------------------------------------------------------------------------
>
> Key: WHIRR-52
> URL: https://issues.apache.org/jira/browse/WHIRR-52
> Project: Whirr
> Issue Type: Improvement
> Components: service/hadoop
> Reporter: Jeff Hammerbacher
>
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