# Node's in Elastic search cluster **URL:** \ **Category:** Elasticsearch\ **Created:** [September 20, 2013, 6:45pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709 "2013-09-20T18:45:36Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![pranav\_amin](https://avatars.discourse-cdn.com/v4/letter/p/a183cd/32.png) [@pranav\_amin](https://discuss.elastic.co/u/pranav_amin)\ **Post date:** [September 20, 2013, 6:45pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/1 "2013-09-20T18:45:36Z")
Hi all, I had some questions on the Nodes in Elasticsearch Cluster - 1. Can i add extra nodes to an EXISTING cluster without restarting ANY OF the nodes in the cluster? If so, how can i do that. 2. Which settings & mapping of an indice, if i change it - i will need to restart the elasticsearch cluster? 3. Is there any way by which i don't set the UNICAST field in the elasticsearch.yml config file, so that the Nodes when they come up they automatically detect the CLUSTER and join it. SINCE I DON'T WANT TO SET the UNICAST discovery.zen.ping.unicast.hosts field. Thanks -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![pranav\_amin](https://avatars.discourse-cdn.com/v4/letter/p/a183cd/32.png) [@pranav\_amin](https://discuss.elastic.co/u/pranav_amin)\ **Post date:** [September 20, 2013, 6:50pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/2 "2013-09-20T18:50:02Z")
On Friday, September 20, 2013 2:45:36 PM UTC-4, pranav amin wrote: > Hi all, > > I had some questions on the Nodes in Elasticsearch Cluster - > > 1. Can i add extra nodes to an EXISTING cluster without restarting ANY OF > the nodes in the cluster? > If so, how can i do that. > > 2. Which settings & mapping of an indice, if i change it - i will need to > restart the elasticsearch cluster? > > 3. Is there any way by which i don't set the UNICAST field in the > elasticsearch.yml config file, so that the Nodes when they come up they > automatically detect the CLUSTER and join it. > SINCE I DON'T WANT TO SET the UNICAST discovery.zen.ping.unicast.hosts > field. 1. Can i just designate A PARTICULAR NODE TO ONLY contain REPLICA DATA? So it will not have ACTIVE SHARD DATA, BUT JUST REPLICA. 2. Can i FORCE my Reporting application to ALWAYS GO TO NODE CONTAINING REPLICA DATA AND NOT TO ACTIVE SHARD? does it offer any performance benefit if i do so? > Thanks -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [September 20, 2013, 6:52pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/3 "2013-09-20T18:52:25Z")
> 1. Can i add extra nodes to an EXISTING cluster without restarting ANY OF the nodes in the cluster? > If so, how can i do that. > YES > bin/elasticseach will start a new node > 1. Which settings & mapping of an indice, if i change it - i will need to restart the elasticsearch cluster? You don't have to stop a cluster when adding/deleting/modifying an index or a mapping. Some index settings can not be changed on an existing index, even with stopping the cluster. > 1. Is there any way by which i don't set the UNICAST field in the elasticsearch.yml config file, so that the Nodes when they come up they automatically detect the CLUSTER and join it. > SINCE I DON'T WANT TO SET the UNICAST discovery.zen.ping.unicast.hosts field. > Use defaults: multicast. HTH David -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [September 20, 2013, 6:56pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/4 "2013-09-20T18:56:41Z")
> 1. Can i just designate A PARTICULAR NODE TO ONLY contain REPLICA DATA? So it will not have ACTIVE SHARD DATA, BUT JUST REPLICA. > 2. Can i FORCE my Reporting application to ALWAYS GO TO NODE CONTAINING REPLICA DATA AND NOT TO ACTIVE SHARD? does it offer any performance benefit if i do so? Why do you want to do that? I don't see any benefit. You have to know that elasticsearch by default will act as a load balancer to distribute the load on shards (primaries and replicas). So basically, you don't have to worry about that. -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![pranav\_amin](https://avatars.discourse-cdn.com/v4/letter/p/a183cd/32.png) [@pranav\_amin](https://discuss.elastic.co/u/pranav_amin)\ **Post date:** [September 20, 2013, 7:49pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/5 "2013-09-20T19:49:35Z")
thanks for the quick turn around. For the 1st, if i bring up a node with the same cluster name would it be detected automatically and join the cluster? are there any settings i need to do. I used to set the Unicast field in config file, but i was just limited to the IP address of nodes i know. In case there is a New Node, i will need to modify this field to make sure it now knows about the New node. Then i will need to restart it. Is there any other way, where automatically it is detected without any config changes? Thanks On Friday, September 20, 2013 2:52:25 PM UTC-4, David Pilato wrote: > > 1. Can i add extra nodes to an EXISTING cluster without restarting ANY > > OF the nodes in the cluster? > > If so, how can i do that. > > YES > > bin/elasticseach will start a new node > > > 1. Which settings & mapping of an indice, if i change it - i will need > > to restart the elasticsearch cluster? > > You don't have to stop a cluster when adding/deleting/modifying an index > or a mapping. > Some index settings can not be changed on an existing index, even with > stopping the cluster. > > > 1. Is there any way by which i don't set the UNICAST field in the > > elasticsearch.yml config file, so that the Nodes when they come up they > > automatically detect the CLUSTER and join it. > > SINCE I DON'T WANT TO SET the UNICAST discovery.zen.ping.unicast.hosts > > field. > > Use defaults: multicast. > > HTH > David -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [September 20, 2013, 8:57pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/6 "2013-09-20T20:57:49Z")
Yes. I said: use default setti -- David 😉 Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs Le 20 sept. 2013 à 21:49, pranav amin [parulpatel25@gmail.com](mailto:parulpatel25@gmail.com) a écrit : > thanks for the quick turn around. > > For the 1st, if i bring up a node with the same cluster name would it be detected automatically and join the cluster? are there any settings i need to do. > I used to set the Unicast field in config file, but i was just limited to the IP address of nodes i know. In case there is a New Node, i will need to modify this field to make sure it now knows about the New node. Then i will need to restart it. > > Is there any other way, where automatically it is detected without any config changes? > > Thanks > > On Friday, September 20, 2013 2:52:25 PM UTC-4, David Pilato wrote: > > > > 1. Can i add extra nodes to an EXISTING cluster without restarting ANY OF the nodes in the cluster? > > > If so, how can i do that. > > > YES > > > bin/elasticseach will start a new node > > > > > 1. Which settings & mapping of an indice, if i change it - i will need to restart the elasticsearch cluster? > > > > You don't have to stop a cluster when adding/deleting/modifying an index or a mapping. > > Some index settings can not be changed on an existing index, even with stopping the cluster. > > > > > 1. Is there any way by which i don't set the UNICAST field in the elasticsearch.yml config file, so that the Nodes when they come up they automatically detect the CLUSTER and join it. > > > SINCE I DON'T WANT TO SET the UNICAST discovery.zen.ping.unicast.hosts field. > > > Use defaults: multicast. > > > > HTH > > David > > -- > You received this message because you are subscribed to the Google Groups "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [September 20, 2013, 9:00pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/7 "2013-09-20T21:00:10Z")
I said: use default settings. That means: don't disable multicast. If you disable multicast, just add a node which have other nodes in the unicast node list. It will "declare" itself to the cluster. -- David 😉 Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs Le 20 sept. 2013 à 21:49, pranav amin [parulpatel25@gmail.com](mailto:parulpatel25@gmail.com) a écrit : > thanks for the quick turn around. > > For the 1st, if i bring up a node with the same cluster name would it be detected automatically and join the cluster? are there any settings i need to do. > I used to set the Unicast field in config file, but i was just limited to the IP address of nodes i know. In case there is a New Node, i will need to modify this field to make sure it now knows about the New node. Then i will need to restart it. > > Is there any other way, where automatically it is detected without any config changes? > > Thanks > > On Friday, September 20, 2013 2:52:25 PM UTC-4, David Pilato wrote: > > > > 1. Can i add extra nodes to an EXISTING cluster without restarting ANY OF the nodes in the cluster? > > > If so, how can i do that. > > > YES > > > bin/elasticseach will start a new node > > > > > 1. Which settings & mapping of an indice, if i change it - i will need to restart the elasticsearch cluster? > > > > You don't have to stop a cluster when adding/deleting/modifying an index or a mapping. > > Some index settings can not be changed on an existing index, even with stopping the cluster. > > > > > 1. Is there any way by which i don't set the UNICAST field in the elasticsearch.yml config file, so that the Nodes when they come up they automatically detect the CLUSTER and join it. > > > SINCE I DON'T WANT TO SET the UNICAST discovery.zen.ping.unicast.hosts field. > > > Use defaults: multicast. > > > > HTH > > David > > -- > You received this message because you are subscribed to the Google Groups "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![pranav\_amin](https://avatars.discourse-cdn.com/v4/letter/p/a183cd/32.png) [@pranav\_amin](https://discuss.elastic.co/u/pranav_amin)\ **Post date:** [September 20, 2013, 9:08pm UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/8 "2013-09-20T21:08:10Z")
thanks a lot. On Friday, September 20, 2013 5:00:10 PM UTC-4, David Pilato wrote: > I said: use default settings. That means: don't disable multicast. > If you disable multicast, just add a node which have other nodes in the > unicast node list. > > It will "declare" itself to the cluster. > > -- > David 😉 > Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs > > Le 20 sept. 2013 à 21:49, pranav amin \<[parulp...@gmail.com](mailto:parulp...@gmail.com) \\> > a écrit : > > thanks for the quick turn around. > > For the 1st, if i bring up a node with the same cluster name would it be > detected automatically and join the cluster? are there any settings i need > to do. > I used to set the Unicast field in config file, but i was just limited to > the IP address of nodes i know. In case there is a New Node, i will need to > modify this field to make sure it now knows about the New node. Then i will > need to restart it. > > Is there any other way, where automatically it is detected without any > config changes? > > Thanks > > On Friday, September 20, 2013 2:52:25 PM UTC-4, David Pilato wrote: > > > > 1. Can i add extra nodes to an EXISTING cluster without restarting ANY > > > OF the nodes in the cluster? > > > If so, how can i do that. > > > YES > > > bin/elasticseach will start a new node > > > > > 1. Which settings & mapping of an indice, if i change it - i will need > > > to restart the elasticsearch cluster? > > > > You don't have to stop a cluster when adding/deleting/modifying an index > > or a mapping. > > Some index settings can not be changed on an existing index, even with > > stopping the cluster. > > > > > 1. Is there any way by which i don't set the UNICAST field in the > > > elasticsearch.yml config file, so that the Nodes when they come up they > > > automatically detect the CLUSTER and join it. > > > SINCE I DON'T WANT TO SET the UNICAST discovery.zen.ping.unicast.hosts > > > field. > > > Use defaults: multicast. > > > > HTH > > David > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearc...@googlegroups.com](mailto:elasticsearc...@googlegroups.com) \. > > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:15am UTC](https://discuss.elastic.co/t/nodes-in-elastic-search-cluster/13709/9 "2017-07-06T02:15:17Z")