Re: [jgroups-users] Can probe be used to recover network splits?

On 17/03/16 15:47, Questions/problems related to using JGroups wrote:
> HI Bela,
> Thank you for your response. This is very helpful. I will try it out !!
>
> The cluster does recover automatically with MERGE3. Only thing it took 6
> hours in one case and 2 hours in other case to finally merge into 1
> cluster.

This should not be the case. Did you look at TRACE logs for GMS and MERGE3?
MERGE3 with min and max around 10 and 30 seconds should take 1-2 rounds, 
so ca. 60 secs max to merge when the network is fine.

I'm sure there's something else going on, preventing a merge. Have you 
checked your thread pools? Do they have queues enabled perhaps? Do you 
configure the internal and/or timer pools as well?

What's you config?

> This is a cluster of 30 Nodes running with TCP as transport.
> The nodes are geographically co-located across the globe.
>
>
> On Thu, Mar 17, 2016 at 4:27 AM, JGroups - General mailing list [via
> JGroups] <[hidden email] </user/SendEmail.jtp?type=node&node=10995&i=0>>
> wrote:
>
>     Hi Pooja,
>
>     On 16/03/16 21:25, Questions/problems related to using JGroups wrote:
>     > Hi ,
>     >
>     > Say if there is a split in the cluster and it is not recovering
>     > automatically inspite of no network issues, has any one tried any probe
>     > commands related to merge3 to heal the cluster automatically?
>
>     There's a @ManagedOperation MERGE3.sendInfo() that can be triggered, so
>     everyone in a cluster sends their information, allowing the coordinator
>     to start a merge.
>
>     However, this doesn't automatically merge the cluster, e.g. if everyone
>     has the same view, then nothing will happen.
>
>     If there is no network problem, and MERGE3 does *not* recover the
>     cluster, then that would be a bug. In such a case, what would be
>     required for diagnosis is:
>     - TRACE logs for all members of GMS and MERGE3
>     - Views of all members. This could be used for a reproducer
>
>     I haven't yet come across a scenario with MERGE3 (*not* MERGE2!) that
>     doesn't heal a network partition when the network is functioning ok
>     again.
>
>      > Thanks
>      > Pooja
>      >
>      >
>     ------------------------------------------------------------------------
>
>     > View this message in context: Can probe be used to recover network
>     > splits?
>      >
>     <http://jgroups.1086181.n5.nabble.com/Can-probe-be-used-to-recover-network-splits-tp10985.html>
>
>     > Sent from the JGroups - General mailing list archive
>      > <http://jgroups.1086181.n5.nabble.com/JGroups-General-f3.html> at
>      > Nabble.com.
>     _____________________________________
>     > javagroups-users mailing list
>     >[hidden email] <http:///user/SendEmail.jtp?type=node&node=10991&i=0>
>     >https://lists.sourceforge.net/lists/listinfo/javagroups-users
>
>     --
>     Bela Ban, JGroups lead (http://www.jgroups.org)
>
>
>     ------------------------------------------------------------------------------
>
>     Transform Data into Opportunity.
>     Accelerate data analysis in your applications with
>     Intel Data Analytics Acceleration Library.
>     Click to learn more.
>     http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140
>     _______________________________________________
>     javagroups-users mailing list
>     [hidden email] <http:///user/SendEmail.jtp?type=node&node=10991&i=1>
>     https://lists.sourceforge.net/lists/listinfo/javagroups-users
>
>
>     ------------------------------------------------------------------------
>     If you reply to this email, your message will be added to the
>     discussion below:
>     http://jgroups.1086181.n5.nabble.com/Can-probe-be-used-to-recover-network-splits-tp10985p10991.html
>
>     To start a new topic under JGroups - General, email [hidden email]
>     </user/SendEmail.jtp?type=node&node=10995&i=1>
>     To unsubscribe from JGroups, click here.
>     NAML
>     <http://jgroups.1086181.n5.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
>
>
>
>
> ------------------------------------------------------------------------
> View this message in context: Re: [jgroups-users] Can probe be used to
> recover network splits?
> <http://jgroups.1086181.n5.nabble.com/Can-probe-be-used-to-recover-network-splits-tp10985p10995.html>
> Sent from the JGroups - General mailing list archive
> <http://jgroups.1086181.n5.nabble.com/JGroups-General-f3.html> at
> Nabble.com.
>
>
> ------------------------------------------------------------------------------
> Transform Data into Opportunity.
> Accelerate data analysis in your applications with
> Intel Data Analytics Acceleration Library.
> Click to learn more.
> http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140
>
>
>
> _______________________________________________
> javagroups-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/javagroups-users
>

-- 
Bela Ban, JGroups lead (http://www.jgroups.org)


------------------------------------------------------------------------------
Transform Data into Opportunity.
Accelerate data analysis in your applications with
Intel Data Analytics Acceleration Library.
Click to learn more.
http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140