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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9864) Notifications bus for use by cluster members keeping up-to-date on changes
Date Wed, 09 Apr 2014 15:28:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13964280#comment-13964280
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Matteo Bertozzi commented on HBASE-9864:
----------------------------------------

{code}I'm worried about missed notifications, and more generally about proving at the time
the update is done that it was applied everywhere, because security guys like proof.{code}
ok. so, do you prefer to fail an operation if a machine is slow?
e.g. the user type 'revoke' and if within the timeout the operation is not applied to every
RS (cache update), the user will get a failure?

> Notifications bus for use by cluster members keeping up-to-date on changes
> --------------------------------------------------------------------------
>
>                 Key: HBASE-9864
>                 URL: https://issues.apache.org/jira/browse/HBASE-9864
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: stack
>            Priority: Blocker
>             Fix For: 1.0.0
>
>
> In namespaces and acls, zk callbacks are used so all participating servers are notified
when there is a change in acls/namespaces list.
> The new visibility tags feature coming in copies the same model of using zk with listeners
for the features' particular notifications.
> Three systems each w/ their own implementation of the notifications all using zk w/ their
own feature-specific watchers.
> Should probably unify.
> Do we have to go via zk?  Seems like all want to be notified when an hbase table is updated.
 Could we tell servers directly rather than go via zk?



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