[jboss-jira] [JBoss JIRA] Commented: (JGRP-100) Large-scale JGroups

[Bela Ban (JIRA)]

    [ https://jira.jboss.org/jira/browse/JGRP-100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12429042#action_12429042 ] 

Bela Ban commented on JGRP-100:
-------------------------------

Further points to look at:

GMS: 
- Is the single coordinator a bottle neck ? When a coord hangs, it won't be able to admit new nodes into the cluster, until it is suspected and excluded
- Use view_bundling

Failure detection:
- Replace FD with FD_ALL

TP, timers:
- Increase thread pools

NAKACK:
- Set use_mcast_xmit="true" if UDP is used. UDP is recommended anyway for large clusters
- Use stats for xmit_timeouts ?

PBCAST:
- Revisit ? 

SMACK:
- Use instead of NAKACK ? Doesn't require GMS
- Improve: don't ack every single message !

FC:
- Increase max_credits

FRAG2:
- Use instead of FRAG
- Get latest version (fix for https://jira.jboss.org/jira/browse/JGRP-800)

Streaming API (?):
- For large values ?

Discovery:
- Use only servers, not clients (https://jira.jboss.org/jira/browse/JGRP-735)
- Workaround: set num_responses to a large value, so we do get some server responses




> Large-scale JGroups
> -------------------
>
>                 Key: JGRP-100
>                 URL: https://jira.jboss.org/jira/browse/JGRP-100
>             Project: JGroups
>          Issue Type: Feature Request
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>             Fix For: 2.x
>
>
> - Run JGroups on hundreds of nodes (either physical, or simulation).
> - Determine a protocol stack that can be used for large-scale execution
> - Example:
>   - Coordinator may be SPOF. If coord is hung, messages will be sent, but no new views will
>     be generated
>   - Retransmission: retransmit from anyone (not sender, otherwise we have NAK implosion)
>   - Look at PBCAST

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