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https://issues.apache.org/jira/browse/HBASE-12954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14302729#comment-14302729
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stack commented on HBASE-12954:
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[~clayb]
bq. I think there's some past design I'm not catching as to a desire to split
internal and external HBase identification.
I wouldn't call it 'design'. In past, hbase relied on folks setting up their
named properly, but we were then repeatedly burned by master having one name
for a regionserver but then the regionserver identifying itself by another
(usually ip and resolved hostname); so one regionserver showed up twice.
The 'fix' was to just let the master say what a regionserver should call itself.
So, given users can't be expected to set up resolve properly, expecting them to
set a 'hostname' in each RS site.xml, is of the same calibre; it is too much to
ask. Its fine if it optional (with the master doing good defense to protect
against it getting two misconfigured RS using same site.xml...)
I take it you like something like the attached patch where optionally we take
what the RS says we should use -- if it had extra stuff like the master-side
defense against double-registration and actual tests to prove it works?
Thanks for your quality input.
> Ability impaired using HBase on multihomed hosts
> ------------------------------------------------
>
> Key: HBASE-12954
> URL: https://issues.apache.org/jira/browse/HBASE-12954
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.4
> Reporter: Clay B.
> Assignee: Ted Yu
> Priority: Minor
> Attachments: 12954-v1.txt, Hadoop Three Interfaces.png
>
>
> For HBase clusters running on unusual networks (such as NAT'd cloud
> environments or physical machines with multiple IP's per network interface)
> it would be ideal to have a way to both specify:
> # which IP interface to which HBase master or region-server will bind
> # what hostname HBase will advertise in Zookeeper both for a master or
> region-server process
> While efforts such as HBASE-8640 go a long way to normalize these two sources
> of information, it is not possible in the current design of the properties
> available to an administrator for these to be unambiguously specified.
> One has been able to request {{hbase.master.ipc.address}} or
> {{hbase.regionserver.ipc.address}} but one can not specify the desired HBase
> {{hbase.master.hostname}}. (It was removed in HBASE-1357, further I am
> unaware of a region-server equivalent.)
> I use a configuration management system to generate all of my configuration
> files on a per-machine basis. As such, an option to generate a file
> specifying exactly which hostname to use would be helpful.
> Today, specifying the bind address for HBase works and one can use an
> HBase-only DNS for faking what to put in Zookeeper but this is far from
> ideal. Network interfaces have no intrinsic IP address, nor hostname.
> Specifing a DNS server is awkward as the DNS server may differ from the
> system's resolver and is a single IP address. Similarly, on hosts which use a
> transient VIP (e.g. through keepalived) for other services, it means there's
> a seemingly non-deterministic hostname choice made by HBase depending on the
> state of the VIP at daemon start-up time.
> I will attach two networking examples I use which become very difficult to
> manage under the current properties.
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