[jboss-jira] [JBoss JIRA] (JGRP-2224) Multiple discovery protocols

[Bela Ban (JIRA)]

    [ https://issues.jboss.org/browse/JGRP-2224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481194#comment-13481194 ] 

Bela Ban commented on JGRP-2224:
--------------------------------

The order is the order of listing the protocols _below_ {{MULTI_PING}}, e.g. in the above case, {{FILE_PING}} will be invoked first.
However, if you set {{async_discovety=true}}, then it doesn't matter, as each protocol will be invoked in a separate thread.

Re merging: the {{Responses}} object takes care of that: a response from a coordinator overwrites existing entries, and otherwise responses from thye same member are only counted once. All elements are of type {{PingData}} and as such are comparable (by sender address).

The discovery protocol typically returns when at least 1 coordinator response has been received, otherwise it waits for the timeout to kick in.

> Multiple discovery protocols
> ----------------------------
>
>                 Key: JGRP-2224
>                 URL: https://issues.jboss.org/browse/JGRP-2224
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 4.0.8
>
>
> Allow for multiple discovery protocols. This would allow us to use a single configuration which includes discovery protocols for multiple cloud providers.
> The discovery protocols could be queried sequentially (return on result), or in parallel.
> Investigate whether we need a super discovery protocol which instantiates the individual protocols, or whether each protocol should be changed e.g. to forward events down the stack.



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