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An error that is frequently met is: hostname associated with the localhost in /etc/hosts. In some cases, Linux distributions do not have multicast enabled by default and the /etc/hosts file does not include the IP address associated with the server's hostname. It will save some CPU activity performed continuously. If you can't have multicast enabled within your network you should disable it on the client side and on the service grid side.
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The GSC count should be added to the commands above above as usual. Machines not running the lookup service should have their agent started using: gs-agent You should use only local lookup service configuration with the agent with the machines running the lookup service: gs-agent -lus=1 -gsm=1 When multicast is disabled global lookup service should not be use. Client locators should have the same list used. This means if the lookup service fails (very low probably to happen) you will be able to start it only on the machines listed on the GS_LOOKUP_LOCATORS list. Disabling multicast discovery means you are loosing dynamicy for the lookup service location. Multicast is not used with replication, notification, monitoring or any client activity against the space. Both are turned on by default on the client side and on the service grid side (GSM,GSC,LUS). It is used as a secondary mechanism for lookup service discovery. Multicast is not a mandatory with GigaSpaces.
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Finding the multicast address in wireshark packet capture how to#
You should use multicast replication when having more than 10 clients acting as replica spaces per target space.įor information on how to disable the Jini Lookup Service Multicast announcements, see the Multicast Settings section of the Lookup Service Configuration page. Space cluster replication uses unicast by default.If you cannot enable multicast in your environment, you can use unicast discovery to allow services and clients to locate the Lookup Service.What should I do if I can't enable multicast? To enable the important capabilities above, you should enable multicast on machines running clients, spaces or services. Refer to the How to Determine Whether Multicast is Available section for more details. What should I do in order to determine if multicast is enabled on my environment? Clients use multicast to discover the Lookup Service and look up a matching service proxy (such as the space).When deploying to the service grid GigaSpaces uses multicast to discover the Lookup Service, and register their proxies.GigaSpaces uses multicast in the following cases: However, there are also other implementations of the multicast distribution strategy listed below. The word "multicast" is typically used to refer to IP Multicast, the implementation of the multicast concept on the IP routing level, where routers create optimal spanning tree distribution paths for data grams sent to a multicast destination address in realtime. Multicast is the delivery of information to a group of destinations simultaneously, using the most efficient strategy to deliver messages over each link of the network only once, and create copies only when the links to the destinations split.