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From "Duo Xu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-18226) Disable reverse DNS lookup at HMaster and use default hostname provided by RegionServer
Date Fri, 16 Jun 2017 19:19:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-18226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Duo Xu updated HBASE-18226:
---------------------------
    Priority: Major  (was: Minor)

> Disable reverse DNS lookup at HMaster and use default hostname provided by RegionServer
> ---------------------------------------------------------------------------------------
>
>                 Key: HBASE-18226
>                 URL: https://issues.apache.org/jira/browse/HBASE-18226
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Duo Xu
>
> This JIRA is to address the similar problem as HBASE-12954, but there are some little
differences,
> 1. HBASE-12954 provides the configuration "hbase.regionserver.hostname" so users can
configure it on every regionserver with preferred hostnames. However, this configuration cannot
be set through Ambari because each regionserver has a different value of this setting.
> 2. In Azure HDInsight clusters, we want to give each RegionServer/workernode a FQDN by
modifying /etc/hosts on that node, then when regionserver starts, 
> {code}
> String hostName = shouldUseThisHostnameInstead() ? useThisHostnameInstead :
>       rpcServices.isa.getHostName();
> {code}
> it uses FQDN names here but on HMaster side, it will do reverse DNS lookup which cannot
be resolved.
> {code}
>  // if regionserver passed hostname to use,
>  // then use it instead of doing a reverse DNS lookup
>  ServerName rs = master.getServerManager().regionServerStartup(request, ia);
> {code}
> My proposed fix is to add a new configuration "*hbase.regionserver.hostname.auto*". If
it is set to true, then Regionserver will use the value returned by *rpcServices.isa.getHostName()*
as the hostname overwriting whatever users specifies in "*hbase.regionserver.hostname*" and
send to HMaster. HMaster will not do reverse DNS lookup, which has been implemented in HBASE-12954.
If users want to provide their own hostnames in "*hbase.regionserver.hostname*", "*hbase.regionserver.hostname.auto*"
must be false.
> I will submit a patch later today.



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