They can act as search nodes, otherwise they don't do much. There are no guidelines other than using an odd number of masters, and as you pointed out, more than just 1. We currently have 3 masters for 25 data nodes.
Regards, Mark Walkom Infrastructure Engineer Campaign Monitor email: ma...@campaignmonitor.com web: www.campaignmonitor.com On 12 August 2014 04:33, Matt Hughes <hughes.m...@gmail.com> wrote: > As a followup, any ratio guidelines for indexing nodes vs dedicated > masters. From what I can tell, it wouldn't make much sense to run with > only one-dedicated master node; if that node goes down, your whole cluster > becomes unavailable. > > > > > On Monday, August 11, 2014 2:18:08 PM UTC-4, Matt Hughes wrote: >> >> Lots of ES best practice articles recommend having dedicated master >> nodes. Specifically, that would involve setting these flags: >> >> node.master: true >> node.data: false >> >> >> Say, you had 7 index nodes and 3 master nodes (https://blog.hipchat.com/ >> 2013/10/16/how-hipchat-scales-to-1-billion-messages/) in your cluster. >> Only one of those three master-eligible nodes are going to be elected >> master; what do the other two do? Do they just exist for resiliency for >> when the elected master goes down? Do they literally not have any other >> role when not elected? >> > -- > 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+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/a3edb88a-8bfc-4cd6-bcb6-95cb29855921%40googlegroups.com > <https://groups.google.com/d/msgid/elasticsearch/a3edb88a-8bfc-4cd6-bcb6-95cb29855921%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit 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+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/CAEM624ZWOAJwVuxTUj_oqyPKfs2nuXJuwidNY0Zr79voAF8gZw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
