Re: [jgroups-users] [ Every day cluster splits ]

The second log shows that node3 consistently discovers a coordinator, 
wheres the first log almost never does this.

Can you verify that there are indeed nodes running on each of these 
addresses: 172.16.42.3[7800],172.16.42.4[7800],172.16.42.5[7800]?

Also make sure that all ports are 7800: if a member starts ans 7800 is 
taken, it might pick 7801. You can prevent this by setting 
TCP_NIO2.port_range="0"; then a node would not start up, but throw an 
exception instead, when 7800 is taken.

You could also try to replace TCPPING with FILE_PING (requires a shared 
file system), TCPGOSSIP or MPING (requires IP mcasting), just to see if 
TCPPING is the culprit.


On 20/04/16 13:41, Questions/problems related to using JGroups wrote:
> A log from another node for the same period of time:
>
> https://gist.github.com/sherman/e17c39d0cfbdfc5bc8cb2241e7f47f3b
>
> On Wed, Apr 20, 2016 at 2:28 PM, Denis Gabaydulin <[email protected]
> <mailto:[email protected]>> wrote:
>
>     Can't find a reason, why a cluster splits every day :-(
>     The cluster has merged back after a dozen of seconds.
>
>     Have 3 nodes configuration.
>
>     <config xmlns="urn:org:jgroups"
>              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>              xsi:schemaLocation="urn:org:jgroups
>     http://www.jgroups.org/schema/JGroups-3.6.9.xsd">
>           <TCP_NIO2
>              bind_port="7800"
>              timer_type="new3"
>              timer.min_threads="4"
>              timer.max_threads="10"
>              timer.keep_alive_time="3000"
>              timer.queue_max_size="500"
>              thread_pool.enabled="true"
>              thread_pool.min_threads="4"
>              thread_pool.max_threads="64"
>              thread_pool.keep_alive_time="20000"
>              thread_pool.queue_enabled="false"
>              thread_pool.queue_max_size="100"
>              thread_pool.rejection_policy="discard"
>
>              oob_thread_pool.enabled="true"
>              oob_thread_pool.min_threads="2"
>              oob_thread_pool.max_threads="8"
>              oob_thread_pool.keep_alive_time="20000"
>              oob_thread_pool.queue_enabled="false"
>              oob_thread_pool.queue_max_size="100"
>              oob_thread_pool.rejection_policy="discard"
>           />
>          <TCPPING
>     initial_hosts="${jgroups.tcpping.initial_hosts:172.16.42.3[7800],172.16.42.4[7800],172.16.42.5[7800]}"
>     port_range="0"/>
>          <MERGE3 min_interval="5000" max_interval="20000"/>
>          <FD_SOCK/>
>          <FD_ALL timeout="90000"/>
>          <VERIFY_SUSPECT/>
>          <pbcast.NAKACK2 use_mcast_xmit="false"/>
>          <UNICAST3/>
>          <pbcast.STABLE/>
>          <pbcast.GMS/>
>          <MFC/>
>          <FRAG2/>
>          <pbcast.STATE_TRANSFER />
>          <CENTRAL_LOCK/>
>     </config>
>
>     Same were on TCP.
>
>     For example a log file from one of the nodes:
>
>     https://gist.github.com/sherman/026114ad85d5b2a10db591c5d39cb9ac
>
>
>
>
>
>
>
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-- 
Bela Ban, JGroups lead (http://www.jgroups.org)


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