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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14958) regionserver.HRegionServer: Master passed us a different hostname to use; was=n04docker2, but now=192.168.3.114
Date Wed, 09 Dec 2015 17:21:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049004#comment-15049004
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Nick Dimiduk commented on HBASE-14958:
--------------------------------------

HBase does work within a virtualized environment. Please see the bit about DNS in the prerequisites
section of the book: http://hbase.apache.org/book.html#basic.prerequisites .

> regionserver.HRegionServer: Master passed us a different hostname to use; was=n04docker2,
but now=192.168.3.114
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-14958
>                 URL: https://issues.apache.org/jira/browse/HBASE-14958
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.1.2
>         Environment: physical machines: redhat7.1
> docker version: 1.9.1
>            Reporter: Yong Zheng
>
> I have two physical machines: c3m3n03docker and c3m3n04docker.
> I started two docker instances per physical node. the topology is like:
> n03docker1(172.17.1.2)  -\
>                                           | br0(172.17.1.1)  +  c3m3n03
> n03docker2(172.17.1.3) -/
> n04docker1(172.17.2.2)  -\
>                                           | br0(172.17.2.1)  +  c3m3n04
> n04docker2(172.17.2.3) -/
> for physical machines, c3m3n03 is bundled with physical adapter enp11s0f0 with IP (192.168.3.113/16);
c3m3n04 is bundled with physical adapter enp11s0f0 with IP(192.168.3.114/16). these two physical
adapters are connecting to the same switch.
> Note: br0 is not bundled to physical adapter enp11s0f0  on both nodes. so, all requests
in 172.17.2.x will be source NAT as 192.168.3.114(c3m3n04) and forwarded to c3m3n03.
> n03docker1: hbase(1.1.2) master
> n03docker2: region server
> n04docker1: region server
> n04docker2: region server
> I first start the n03docker1 and n03docker2, it works; after that, I start n04docker2
and it will reported:
> 2015-12-09 08:01:58,259 ERROR [regionserver/n04docker2.gpfs.net/172.17.2.3:16020] regionserver.HRegionServer:
Master passed us a different hostname to use; was=n04docker2.gpfs.net, but now=192.168.3.114
> on the master logs:
> 2015-12-09 08:11:12,234 INFO  [PriorityRpcServer.handler=0,queue=0,port=16000] master.ServerManager:
Registering server=192.168.3.114,16020,1449666670721
> So, you see, when hbase master receives the requests from n04docker2, all these requests
are source NATed with 192.168.3.114(not 172.17.2.3).  and hbase master passes 192.168.3.114
back to 172.17.2.3(n04docker2). Thus, n04docker1(172.17.2.3) reported exceptions in logs.
> hbase doesn't support running in virtualization cluster? because SNAT is widely used
in virtualization. if hbase master get remote hostname/ip(thus get 192.168.3.114) and pass
it back to region server, it will hit this issues.
> HBASE-8667 doesn't fix this issue because the fix has been hbase 0.98(I'm taking hbase
1.1.2).



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