[jboss-jira] [JBoss JIRA] Commented: (JGRP-844) Discovery: make it a singleton with a shared transport

[Bela Ban (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12435115#action_12435115 ] 

Bela Ban commented on JGRP-844:
-------------------------------

Seems like the case you described can be solved by keying the cache on the cluster name:

In step 3, since there is no entry in the cache for "2", B will actually run the discovery phase and - since it gets no response for "2" - become a singleton member.

As soon as view information becomes available (when a node has joined the cluster), we replace the (discovery) cache entries with the contents of the view, also per cluster name.

> Discovery: make it a singleton with a shared transport
> ------------------------------------------------------
>
>                 Key: JGRP-844
>                 URL: https://jira.jboss.org/jira/browse/JGRP-844
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.8
>
>
> When we have a shared transport and 5 channels on top of it, then every channel will run the discovery protocol. If it is the first node in a cluster, this will take <5 * Discovery.timeout> ms.
> Now, if the 5 channels didn't just share the transport, but also the discovery protocol, then only the first channel to start would have to wait for Discovery.timeout ms. It would then cache the results of that discovery and, when view changes are received, replace the contents of the cache with view information.
> The remaining 4 channels would then not even need to run the discovery phase, but the discovery protocol would simply use the current view to return the coordinator. This means that instead of 5 * timeout, we have 1 * timeout !

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