[jboss-jira] [JBoss JIRA] (JGRP-1816) Message: add flag DONT_LOOPBACK

[Bela Ban (JIRA)]

     [ https://issues.jboss.org/browse/JGRP-1816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-1816.
----------------------------

    Resolution: Done

    
> Message: add flag DONT_LOOPBACK
> -------------------------------
>
>                 Key: JGRP-1816
>                 URL: https://issues.jboss.org/browse/JGRP-1816
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 3.5
>
>
> When flag {{DONT_LOOPBACK}}, then multicast messages ({{dest}} == null) are not looped back up the stack. This can be useful in some cases, e.g. discovery:
> * A multicasts a discovery request
> * A gets the discovery request and adds information shipped with it (A's logical-physical address mapping and logical name) to its local cache(s)
> * A sends a discovery response to itself
> * A gets the discovery response and adds its information *again*
> --> Because the information was already present, it doesn't need to be added, *but was added 2 more times* !
> --> This unneeded processing costs threads from the pool, processing power, locks etc
> SOLUTION:
> * When sending a multicast message we loop it back up and then multicast  it. When received by the sender, we drop it.
> * We now don't even loop back the message if DONT_LOOPBACK is set

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