The heartbeat interval is a property of the replication domain and specifies the frequency with which the replication domain communicates with the replication server. The replication domain expects a regular heartbeat at this interval from the replication server. If the heartbeat is not received, the domain closes its connection and connects to another replication server in the topology.
The default heartbeat interval is ten seconds. If replication is running over a WAN or a network with slow response times, you might want to increase the heartbeat interval. In addition, if you observe an error similar to the following in the logs, it is probably necessary to increase the heartbeat interval.
[26/May/2009:16:32:50 +0200] category=SYNC severity=NOTICE msgID=15138913 msg=Replication Heartbeat Monitor on RS rserver/18.104.22.168:8989 30382 for dc=example,dc=com in DS 10879 is closing the session because it could not detect a heartbeat
The heartbeat interval is sensitive to the settings of your JVM. If you require a lower heartbeat interval than the default, you must configure your JVM to have a low pause time during garbage collection by setting the -XX:+UseConcMarkSweepGC option. For more information, see Configuring the JVM, Java Options, and Database Cache in Sun OpenDS Standard Edition 2.0 Installation Guide.
$ dsconfig -D "cn=directory manager" -w password -n get-replication-domain-prop \ --provider-name "Multimaster Synchronization" \ --domain-name "dc=example,dc=com (domain 15853)" --advanced \ --property heartbeat-interval Property : Value(s) -------------------:--------- heartbeat-interval : 10 s
The following command changes the heartbeat interval to 5 seconds.
$ dsconfig -D "cn=directory manager" -w password -n set-replication-domain-prop \ --provider-name "Multimaster Synchronization" \ --domain-name "dc=example,dc=com (domain 15853)" --set heartbeat-interval:5s