[jira] [Resolved] (HBASE-8216) Be able to differentiate Power failures from Rack switch reboot

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

     [ https://issues.apache.org/jira/browse/HBASE-8216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amitanand Aiyer resolved HBASE-8216.
------------------------------------

    Resolution: Fixed
    
> Be able to differentiate Power failures from Rack switch reboot
> ---------------------------------------------------------------
>
>                 Key: HBASE-8216
>                 URL: https://issues.apache.org/jira/browse/HBASE-8216
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Amitanand Aiyer
>            Assignee: Amitanand Aiyer
>            Priority: Minor
>             Fix For: 0.89-fb
>
>
> The master in 0.89-fb waits for 5-6 mins to check if RS'es become accessible; when it sees a co-related failure such as a rack-switch-reboot.
> The rationale behind doing this is that it is not worth assigning and reassigning regions -- causing churn, when the rack switch reboots are expected to heal themselves in 5-6 mins. In earlier deployments, where this feature was not present, we used to find ourselves in a bad situation for 30mins-1hr.
> However, co-related failures also happen when there is a power failure for the rack. These cases take much longer to heal; so waiting for 5-6 mins is a wasted effort.
> The master should be able to differentiate the two scenario, by checking if *any* of the RS in the rack is able to communicate. Unless all the servers in the rack are unaccessible, we should proceed with reassigning the regions.

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