In 2.21 the architecture is different, collector will establish one connection to one cassandra server per generator. If that fails, it will retry the next server. This is evident from the collector logs. It seems that you are getting TimedOutException which suggests your single remaining cassandra node might be getting overloaded.
If you check using netstat -anp for contrail-collector pid you should be seeing connections to the 10.10.10.5 cassandra node. Thanks Megh On Nov 29, 2016, at 12:04 AM, Suresh Kumar S <sureshkuma...@altencalsoftlabs.com<mailto:sureshkuma...@altencalsoftlabs.com>> wrote: Hi Megh, My scenario is very simple, My setup : Devstack - Mitaka Contrail : 2.21.x I have configured the cassandra cluster with two nodes, and specified those in the contrail-collector.conf file cloud@contrail:/etc/cassandra$ cat /etc/contrail/contrail-collector.conf [DEFAULT] log_local = 1 log_level = SYS_DEBUG cassandra_server_list = 10.10.10.5:9160 10.10.10.4:9160 hostname = contrail hostip = 10.10.10.6 [DISCOVERY] port = 5998 server = 10.10.10.6 cloud@contrail:/etc/cassandra$ Collector establishes the communication with 10.10.10.4, and works well. I purposefully down the 10.10.10.4 cassandra server. I expect contrail-control continue to work with 10.10.10.5 cassandra server. But contrail-control keeps trying to connect with 10.10.10.4 and fails to connect. Note: 1. Collector establishes the communication with only one server(10.10.10.4) out of two mentioned. collector logs are attached for debugging. Thanks suresh ________________________________ From: "Megh Bhatt" <me...@juniper.net<mailto:me...@juniper.net>> To: "Suresh Kumar S" <sureshkuma...@altencalsoftlabs.com<mailto:sureshkuma...@altencalsoftlabs.com>> Cc: Dev@lists.opencontrail.org<mailto:Dev@lists.opencontrail.org> Sent: Tuesday, November 29, 2016 8:48:20 AM Subject: Re: [opencontrail-dev] cassandra server switchover Hi Suresh, cassandra supports active/active or cluster consisting of multiple active nodes and hence we can provide list of IP addresses to contrail-collector. contrail-collector simultaneously connects to all the cassandra servers and will handle cassandra server failures. Thanks Megh On Nov 28, 2016, at 11:43 PM, Suresh Kumar S <sureshkuma...@altencalsoftlabs.com<mailto:sureshkuma...@altencalsoftlabs.com>> wrote: Hi, In the contrail-collector config file, we can specify multiple cassandra servers. What is the purpose of it ? contrail-collecter.conf snippet # IP address and port to be used to connect to cassandra. # Multiple IP:port strings separated by space can be provided # cassandra_server_list=127.0.0.1:9042 Does contrail support server switchover, I mean when the current server is not reachable, will it switch to the new server(mentioned in the config) ? Thanks suresh _______________________________________________ Dev mailing list Dev@lists.opencontrail.org<mailto:Dev@lists.opencontrail.org> http://lists.opencontrail.org/mailman/listinfo/dev_lists.opencontrail.org <collector.log>
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