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From "Jeffrey E Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11502) dn.js set datanode UI to window.location.hostname, it should use jmx bean property to setup hostname
Date Tue, 07 Mar 2017 20:14:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15900070#comment-15900070
] 

Jeffrey E  Rodriguez commented on HDFS-11502:
---------------------------------------------

Only concern we may have :
Hostname in JVMMetrics uses InetAddress.getLocalHost().getHostName() which may resolve in
some cases to localhost or 127.0.0.0.  
   At this point I don't know of a better datanode jmx  beab  property or method that would
reflect the real datanode hostname (FQDN) so we can differentiate datanodes if there are going
through a proxy. (the previous way would showed the proxy hostname instead because window.location.hostname).
In addition JS window.location may not be a portable way to provide that information either.

So to community, would like to ask if there is a reliable way available to datanode JMX beans
to show FQDN or hostname of datanode.


> dn.js set datanode UI to window.location.hostname, it should use jmx bean property to
setup hostname
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11502
>                 URL: https://issues.apache.org/jira/browse/HDFS-11502
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 2.7.2, 2.7.3
>         Environment: all
>            Reporter: Jeffrey E  Rodriguez
>            Assignee: Jeffrey E  Rodriguez
>             Fix For: 2.8.0, 2.7.3, 3.0.0-alpha1, 3.0.0-alpha2
>
>         Attachments: HDFS-11502.001.patch, HDFS-11502.002.patch
>
>
> Datanode UI calls "dn.js" which loads properties for datanode.  "dn.js" sets "data.dn.HostName"
datanode UI to "window.location.hostname", it should use a datanode property from jmx beans
or an appropriate property. The issue is
> that if we use a proxy to access datanode UI we would show proxy hostanme instead of
actual datanode hostname.
> I am proposing using Hadoop:service=DataNode,name=JvmMetrics" tag.Hostname field to do
that.



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