[
https://issues.apache.org/jira/browse/HBASE-12954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14301948#comment-14301948
]
Clay B. commented on HBASE-12954:
---------------------------------
Hi Andrew Purtell, indeed this can happen under my networks:
One could -- intentionally -- have an apparent mismatch of IP and hostname. In
the case of the OpenStack network, a region server may talk to a master on the
same private (tenancy) network -- all traffic would go via the 100.127.1.0/24.
But for external clients to be able to talk in, Zookeeper would be advertising
the {{*.tenant.openstack.example.com}} DNS names (192.168.101.0/24 network).
The master should always be able to reach the regionserver on the IP the
regionserver is bound to {{hbase.regionserver.ipc.address}}, but what is
advertised in Zookeeper may be different than what the master would reverse-DNS
lookup for the regionserver's bound IP address.
Conversely, what is advertised in Zookeeper should always reach the
regionserver from anywhere in my networks (e.g. an external client or the
master).
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
