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From "Amitanand Aiyer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-8216) Be able to differentiate Power failures from Rack switch reboot
Date Thu, 28 Mar 2013 19:35:15 GMT

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

Amitanand Aiyer updated HBASE-8216:
-----------------------------------

    Attachment: hbase-8216.diff
    
> 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
>
>         Attachments: hbase-8216.diff
>
>
> 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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