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Posted to dev@oozie.apache.org by "Ryota Egashira (JIRA)" <ji...@apache.org> on 2014/05/10 23:59:55 UTC

[jira] [Commented] (OOZIE-1678) HA support for SLA

    [ https://issues.apache.org/jira/browse/OOZIE-1678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13994024#comment-13994024 ] 

Ryota Egashira commented on OOZIE-1678:
---------------------------------------

one change from initial design mentioned above,  Initial loading at start-up, each oozie server loads whole set from DB into SlaMap (instead of loading partial set).   otherwise some SlaMap entries will not be loaded and missed. (e.g., 1st server A starts, all entries loaded to A,   then Server B starts,  suppose a half set loaded to B (since 2 servers running), if server A is down,  the remaining half will be lost, and not checked after that).  
other than that, the approach is as mentioned above. when iterating over Slamap, ZK lock prevents multiple servers from updating the same entry.

patch is on RB.   [~rkanter]   if any feedback/suggestion on the patch, appreciated it.



> HA support for SLA
> ------------------
>
>                 Key: OOZIE-1678
>                 URL: https://issues.apache.org/jira/browse/OOZIE-1678
>             Project: Oozie
>          Issue Type: Sub-task
>          Components: HA
>            Reporter: Ryota Egashira
>            Assignee: Ryota Egashira
>
> SLA Service needs to be changed to perform SLA calculation on multiple oozie servers in HA setting.



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