# Sizing master nodes **URL:** \ **Category:** Elasticsearch\ **Created:** [February 3, 2015, 3:09pm UTC](https://discuss.elastic.co/t/sizing-master-nodes/21957 "2015-02-03T15:09:44Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![javadevmtl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javadevmtl/32/45613_2.png) [@javadevmtl](https://discuss.elastic.co/u/javadevmtl)\ **Post date:** [February 3, 2015, 3:09pm UTC](https://discuss.elastic.co/t/sizing-master-nodes/21957/1 "2015-02-03T15:09:44Z")
Hi I read bunch of things on master nodes etc... So I have some decent machines 4x 32core 128GB RAM and 6x960GB SSDS (RAID 5 so 4.3 TB) So all 4 machines will be data nodes configured to 32GB. I was also thinking of running the master nodes on same machines on separate JVM using N/2+1. But how much RAM do master nodes need to be etc? -- 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). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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:** [February 3, 2015, 3:47pm UTC](https://discuss.elastic.co/t/sizing-master-nodes/21957/2 "2015-02-03T15:47:57Z")
For a master only nodes on a small cluster (I mean small number of nodes/indices/mappings), you can probably set HEAP to 1gb. (512 Mb should work as well probably) My 2 cents -- David Pilato | Technical Advocate | [Elasticsearch.com](http://Elasticsearch.com) @dadoonet [https://twitter.com/dadoonet](https://twitter.com/dadoonet) | @elasticsearchfr [https://twitter.com/elasticsearchfr](https://twitter.com/elasticsearchfr) | @scrutmydocs [https://twitter.com/scrutmydocs](https://twitter.com/scrutmydocs) > Le 3 févr. 2015 à 16:09, John Smith [java.dev.mtl@gmail.com](mailto:java.dev.mtl@gmail.com) a écrit : > > Hi I read bunch of things on master nodes etc... > > So I have some decent machines 4x 32core 128GB RAM and 6x960GB SSDS (RAID 5 so 4.3 TB) > > So all 4 machines will be data nodes configured to 32GB. > > I was also thinking of running the master nodes on same machines on separate JVM using N/2+1. But how much RAM do master nodes need to be etc? > > -- > 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) [mailto:elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com) [https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com?utm_medium=email&utm_source=footer). > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout) [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- 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). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/2F9F1907-0E42-42C7-BA9E-8963F63C21D6%40pilato.fr](https://groups.google.com/d/msgid/elasticsearch/2F9F1907-0E42-42C7-BA9E-8963F63C21D6%40pilato.fr). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![javadevmtl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javadevmtl/32/45613_2.png) [@javadevmtl](https://discuss.elastic.co/u/javadevmtl)\ **Post date:** [February 3, 2015, 9:45pm UTC](https://discuss.elastic.co/t/sizing-master-nodes/21957/3 "2015-02-03T21:45:01Z")
Eh well I have 128GB 32GB for ES data 32GB for the OS for file caching? And then there another 64GB to play with I supose 4GB for master node is ok. But is it ok to deploy the master node on same box as data node on separate JVM process since I have the horse power? On Tuesday, 3 February 2015 10:48:10 UTC-5, David Pilato wrote: > For a master only nodes on a small cluster (I mean small number of > nodes/indices/mappings), you can probably set HEAP to 1gb. (512 Mb should > work as well probably) > > My 2 cents > > -- > _David Pilato_ | _Technical Advocate_ | _[Elasticsearch.com](http://Elasticsearch.com) > [http://Elasticsearch.com](http://Elasticsearch.com)_ > @dadoonet [https://twitter.com/dadoonet](https://twitter.com/dadoonet) | @elasticsearchfr > [https://twitter.com/elasticsearchfr](https://twitter.com/elasticsearchfr) | @scrutmydocs > [https://twitter.com/scrutmydocs](https://twitter.com/scrutmydocs) > > Le 3 févr. 2015 à 16:09, John Smith \<[java.d...@gmail.com](mailto:java.d...@gmail.com) \\> a > écrit : > > Hi I read bunch of things on master nodes etc... > > So I have some decent machines 4x 32core 128GB RAM and 6x960GB SSDS (RAID > 5 so 4.3 TB) > > So all 4 machines will be data nodes configured to 32GB. > > I was also thinking of running the master nodes on same machines on > separate JVM using N/2+1. But how much RAM do master nodes need to be etc? > > -- > 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) \. > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com) > [https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- 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). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/8df1f13d-eab4-4694-9ddc-87bb0c393c3a%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/8df1f13d-eab4-4694-9ddc-87bb0c393c3a%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![javadevmtl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javadevmtl/32/45613_2.png) [@javadevmtl](https://discuss.elastic.co/u/javadevmtl)\ **Post date:** [February 3, 2015, 9:47pm UTC](https://discuss.elastic.co/t/sizing-master-nodes/21957/4 "2015-02-03T21:47:07Z")
And right i don't envision more than 10-12 node cluster On Tuesday, 3 February 2015 16:45:01 UTC-5, John Smith wrote: > Eh well I have 128GB > > 32GB for ES data > 32GB for the OS for file caching? > > And then there another 64GB to play with I supose 4GB for master node is > ok. > > But is it ok to deploy the master node on same box as data node on > separate JVM process since I have the horse power? > > On Tuesday, 3 February 2015 10:48:10 UTC-5, David Pilato wrote: > > > For a master only nodes on a small cluster (I mean small number of > > nodes/indices/mappings), you can probably set HEAP to 1gb. (512 Mb should > > work as well probably) > > > > My 2 cents > > > > -- > > _David Pilato_ | _Technical Advocate_ | _[Elasticsearch.com](http://Elasticsearch.com) > > [http://Elasticsearch.com](http://Elasticsearch.com)_ > > @dadoonet [https://twitter.com/dadoonet](https://twitter.com/dadoonet) | @elasticsearchfr > > [https://twitter.com/elasticsearchfr](https://twitter.com/elasticsearchfr) | @scrutmydocs > > [https://twitter.com/scrutmydocs](https://twitter.com/scrutmydocs) > > > > Le 3 févr. 2015 à 16:09, John Smith [java.d...@gmail.com](mailto:java.d...@gmail.com) a écrit : > > > > Hi I read bunch of things on master nodes etc... > > > > So I have some decent machines 4x 32core 128GB RAM and 6x960GB SSDS (RAID > > 5 so 4.3 TB) > > > > So all 4 machines will be data nodes configured to 32GB. > > > > I was also thinking of running the master nodes on same machines on > > separate JVM using N/2+1. But how much RAM do master nodes need to be etc? > > > > -- > > 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). > > To view this discussion on the web visit > > [https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com) > > [https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/a6443665-2999-4e66-938e-8b5ac49dbd59%40googlegroups.com?utm_medium=email&utm_source=footer) > > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- 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). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/e99beb41-88cd-4bab-a9b1-bb620979ee03%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/e99beb41-88cd-4bab-a9b1-bb620979ee03%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Sarang\_Zargar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sarang_zargar/32/935_2.png) [@Sarang\_Zargar](https://discuss.elastic.co/u/Sarang_Zargar)\ **Post date:** [February 4, 2015, 7:43am UTC](https://discuss.elastic.co/t/sizing-master-nodes/21957/5 "2015-02-04T07:43:07Z")
It is fine to give 2-4 GB (though 4 is on higher side) to your masters as they are not doing anything really heavy, all they do is exchange cluster state/routing table etc. Spinning off the masters on the same host (box) as data node can potentially cause some issues (e.g. High CPU resulting in overall slowness and master becoming unresponsive or host restart resulting in master as well as data node loss). We have exactly same setup (infact we have even beefy machines and during our topology design we kept masters on separate hardware which can be commodity hardware) If you can't have more hardware, then spreading master across multiple hosts will mitigate the split brain to a great extent. On Tuesday, 3 February 2015 07:09:44 UTC-8, John Smith wrote: > Hi I read bunch of things on master nodes etc... > > So I have some decent machines 4x 32core 128GB RAM and 6x960GB SSDS (RAID > 5 so 4.3 TB) > > So all 4 machines will be data nodes configured to 32GB. > > I was also thinking of running the master nodes on same machines on > separate JVM using N/2+1. But how much RAM do master nodes need to be etc? -- 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). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/4ee68071-731b-492d-80fd-782b35c05c99%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/4ee68071-731b-492d-80fd-782b35c05c99%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![javadevmtl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javadevmtl/32/45613_2.png) [@javadevmtl](https://discuss.elastic.co/u/javadevmtl)\ **Post date:** [February 4, 2015, 2:17pm UTC](https://discuss.elastic.co/t/sizing-master-nodes/21957/6 "2015-02-04T14:17:16Z")
Yeah I have four boxes now. So I can at least put master nodes on same physical boxes in separate jam instances at least. So 4 data nodes and 3 master nodes. -- 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). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/dd37815f-308e-47bd-a252-513caa11a103%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/dd37815f-308e-47bd-a252-513caa11a103%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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, 12:34am UTC](https://discuss.elastic.co/t/sizing-master-nodes/21957/7 "2017-07-06T00:34:58Z")