[jboss-jira] [JBoss JIRA] Commented: (JGRP-735) Discovery: ignore discovery responses from clients

[Bela Ban (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12430229#action_12430229 ] 

Bela Ban commented on JGRP-735:
-------------------------------

Okay, I added num_initial_srv_members. Here's how the algorithm works:

If num_initial_srv_members > 0:
  - Return as soon as we have the specified number of *server* responses (from members which already joined)
Else return as soon as we have num_initial_members responses (clients or servers).

Note that if break_on_coord_rsp is true, then we terminate the discovery phase and return as soon as we have 1 coord response

Docu is at http://wiki.jboss.org/auth/wiki/JGroupsPING.

> Discovery: ignore discovery responses from clients
> --------------------------------------------------
>
>                 Key: JGRP-735
>                 URL: https://jira.jboss.org/jira/browse/JGRP-735
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>            Priority: Minor
>             Fix For: 2.7
>
>
> If we have 9 joining members (starting simultaneously) and 1 operational member X, and
> num_initial_rsps=5 and
> timeout=3000
> ,then a joining member might receive 5 responses from other joining clients and *not* the one from the existing member. 
> This is good when we have *initial* concurrent startups, but not when we have existing 'well-known' operational members running.
> FEATURE: add a flag 'ignore-client-responses' which will collect only responses from operational members (servers). In the above case, each joining member will either get a response from X, or time out after 5 secs. We could also define a min_operational_resps, which (enabled if > 0) defines the minimum number of responses which need to be received from operational member and ignores responses from client members.
> WORKAROUND: increase num_initial_mbrs and timeout

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