[jira] [Assigned] (OOZIE-1564) Metadata for dead Oozie servers should remain in ZK

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

     [ https://issues.apache.org/jira/browse/OOZIE-1564?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bowen Zhang reassigned OOZIE-1564:
----------------------------------

    Assignee: Bowen Zhang  (was: Robert Kanter)

> Metadata for dead Oozie servers should remain in ZK
> ---------------------------------------------------
>
>                 Key: OOZIE-1564
>                 URL: https://issues.apache.org/jira/browse/OOZIE-1564
>             Project: Oozie
>          Issue Type: Improvement
>          Components: HA
>    Affects Versions: trunk
>            Reporter: Robert Kanter
>            Assignee: Bowen Zhang
>
> As per the discussion in OOZIE-1561, we should have two services in the service discovery on ZK:
> # Contains the metadata for any Oozie server that has ever connected, even ones that are currently dead
> #- This would be used by log streaming so that dead servers are always identified
> #- I think there is an easy way to do this with a setting in Curator, but I have to test it.  If not, then we'll have to manually create/manage the ZNodes.
> # Contains the metadata for any Oozie server that is still alive (the current behavior)
> #- This would be used by the mod calculation so only alive servers are included
> Maintaining two lists will avoid the need to do any pinging or tricky heartbeating.  
> We'd have to add a new admin command to cleanup the dead servers.  It would look at which servers are not in the alive list and remove those.
> It would also be good to update the admin command that lists servers to specify which ones are alive and which are dead; and possibly have filtering (i.e. show only alive servers, show only dead servers, show all servers)



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