[jira] Commented: (HBASE-1679) Flapping DNS does us more harm than it need to

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

    [ https://issues.apache.org/jira/browse/HBASE-1679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12806543#action_12806543 ] 

Kannan Muthukkaruppan commented on HBASE-1679:
----------------------------------------------

Yup, this is pretty much the issue we ran into.

And when the regionserver was asked to restarted, it registered itself again under /hbase/rs in zookeeper using a new startcode as the element (znode) name.

> Flapping DNS does us more harm than it need to
> ----------------------------------------------
>
>                 Key: HBASE-1679
>                 URL: https://issues.apache.org/jira/browse/HBASE-1679
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.21.0
>
>
> Over in HBASE-1675, JSharp has posted logs where a temporary DNS outage does his cluster a death blow.
> When cluster members report in, the master composes the regionserver name by doing a hostname lookup and appending it to port and startcode passed over by the regionserver.  The host lookup during a DNS outage when from name to IP.  Master then thought this regionserver an unknown host and told it restart.... and so on.
> If the regionserver composed its name once, it could pass this the master and avoid a DNS lookup per regionserver report.

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