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Date: Wed, 9 Dec 2015 16:32:11 +0000 (UTC)
From: "Yong Zheng (JIRA)" <jira@apache.org>
To: dev@hbase.apache.org
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Subject: [jira] [Created] (HBASE-14958) regionserver.HRegionServer: Master
 passed us a different hostname to use; was=n04docker2, but
 now=192.168.3.114
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Yong Zheng created HBASE-14958:
----------------------------------

             Summary: 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 n04docker1 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 n04docker1, all these requests are source NATed with 192.168.3.114(not 172.17.2.2).  and hbase master passes 192.168.3.114 back to 172.17.2.2(n04docker1). Thus, n04docker1(172.17.2.2) 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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