[jgroups-users] No group merge after offline channel creation

Hello,

I am using jgroups in my application for message based data 
synchronization. As long as the channel is created when there is a 
network connection everything is fine, even when after that a network 
interrupt with later reconnect appears (merge is done then).

But when a node starts up without a network connection it creates the 
channel with himself as only member. When that node is reconnected to 
the network I expected a group merge with the other online nodes. 
Unfortunately this does not happen. Both cluster are operating side by 
side with 2 different states now.

Is there something I can add to my protocol stack or another solution to 
handle that somehow?

My current udp.xml:
> <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.xsd">
>     <UDP
>          mcast_port="${jgroups.udp.mcast_port:45588}"
>          tos="8"
>          ucast_recv_buf_size="20M"
>          ucast_send_buf_size="640K"
>          mcast_recv_buf_size="25M"
>          mcast_send_buf_size="640K"
>          loopback="true"
>          discard_incompatible_packets="true"
>          max_bundle_size="64K"
>          max_bundle_timeout="30"
>          ip_ttl="${jgroups.udp.ip_ttl:2}"
>          enable_diagnostics="true"
>          thread_naming_pattern="cl"
>
>          thread_pool.enabled="true"
>          thread_pool.min_threads="2"
>          thread_pool.max_threads="8"
>          thread_pool.keep_alive_time="5000"
>          thread_pool.queue_enabled="true"
>          thread_pool.queue_max_size="10000"
>          thread_pool.rejection_policy="discard"
>
>          oob_thread_pool.enabled="true"
>          oob_thread_pool.min_threads="1"
>          oob_thread_pool.max_threads="8"
>          oob_thread_pool.keep_alive_time="5000"
>          oob_thread_pool.queue_enabled="false"
>          oob_thread_pool.queue_max_size="100"
>          oob_thread_pool.rejection_policy="Run"/>
>
>     <PING />
>     <MERGE3 max_interval="3000"
>             min_interval="1500"
>             check_interval="5000"/>
>     <FD_SOCK/>
>     <FD_ALL2 timeout="3000"
>              interval="1000"
>              timeout_check_interval="750"/>
>     <VERIFY_SUSPECT timeout="1500"  />
>     <BARRIER />
>     <pbcast.NAKACK exponential_backoff="150"
>                    use_mcast_xmit="true"
>                    retransmit_timeout="300,600,1200"
>                    discard_delivered_msgs="true"/>
>     <UNICAST />
>     <pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000"
>                    max_bytes="1000000"/>
>     <pbcast.GMS print_local_addr="true" join_timeout="3000"
>
>                 view_bundling="true"/>
>     <SEQUENCER />
>     <FC max_credits="500000"
>                     min_threshold="0.20"/>
>     <FRAG2 frag_size="60K"  />
>     <!--pbcast.STREAMING_STATE_TRANSFER /-->
>     <pbcast.STATE_TRANSFER  />
>     <!-- pbcast.FLUSH/-->
> </config>

Best regards,

Maximilian Gerhard

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