[jira] Resolved: (HBASE-2722) Replace IP with hostname in ZK for servers

["stack (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-2722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack resolved HBASE-2722.
--------------------------

    Resolution: Fixed

bq. We could I assume. The difference is that if we were to store full HServerAddress we would also get the IP address and would not have to rely on some on-the-spot reverse lookups.

We don't do the reverse lookups any more. The only lookup done now is when regionserver reports into master, the master looks up the regionservers address, and then in the response to reportServerStartup, the master tells the regionserver how to identify itself ever after.  We could afterward become untethered from DNS and all should just keep working.

The other tendency is a move away from IPs altogether to rather have servers identify themselves by hostname.

I'm going to close this issue as mostly done.  Lets open a new issue if there is something more you'd like done Lars?

> Replace IP with hostname in ZK for servers
> ------------------------------------------
>
>                 Key: HBASE-2722
>                 URL: https://issues.apache.org/jira/browse/HBASE-2722
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.20.4
>            Reporter: Lars George
>             Fix For: 0.90.0
>
>
> See http://review.hbase.org/r/162/ for details, we currently store the IP address of the master in ZK, not its hostname. 
> {code}
>   public ClusterStatus getClusterStatus() {
>     ClusterStatus status = new ClusterStatus();
>     status.setHBaseVersion(VersionInfo.getVersion());
>     HServerAddress hsa = zooKeeperWrapper.readMasterAddress(null);
>     status.setActiveMaster(hsa != null && hsa.getBindAddress() != null ?
>       hsa.getBindAddress() : "");
>     status.setServerInfo(serverManager.getServersToServerInfo().values());
>     status.setDeadServers(serverManager.getDeadServers());
>     status.setRegionsInTransition(this.regionManager.getRegionsInTransition());
>     return status;
>   }
> {code}
> Maybe best is to store a full HServerAddress to be able to print "hostname/ip-address" style similar to other places in the system?

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