I didn't quite understand. What I am trying to find is that when default formula of N / 2 + 1 I will always have more master nodes on one side correct? And is my understanding incorrect that the other side that has less master nodes than N /2 + 1 would simply not accept any requests? The only point of increasing this value would be for performance reasons?
On Mon, Jan 13, 2014 at 3:58 PM, Mark Walkom <[email protected]>wrote: > That depends on however many nodes lose contact, but it's a possibility > that if you lose 2 of your nodes at once they will just stop responding and > the other 3 will be ok. > However you maintain cluster integrity. > > Regards, > Mark Walkom > > Infrastructure Engineer > Campaign Monitor > email: [email protected] > web: www.campaignmonitor.com > > > On 14 January 2014 10:55, Mohit Anchlia <[email protected]> wrote: > >> How would the nodes on the other side of the network become master with >> the formula (total num of nodes / 2 + 1) one side will always become >> inaccessible? >> >> On Mon, Jan 13, 2014 at 3:50 PM, Mark Walkom >> <[email protected]>wrote: >> >>> The logs shows that a node was not contactable and so was removed from >>> the cluster. >>> That could be a load issue on the node, network issues, or something >>> else. Check the logs on the node that disconnected and see what you find. >>> >>> If you leave the defaults, you risk the chance of a split-brain >>> situation, where nodes lose contact with each other and then decide to >>> become a master. This can cause you to end up with multiple masters in >>> multiple clusters, which is not good for data integrity. >>> >>> Setting the min masters means that if a node cannot contact N masters, >>> it will refuse connections. >>> >>> Regards, >>> Mark Walkom >>> >>> Infrastructure Engineer >>> Campaign Monitor >>> email: [email protected] >>> web: www.campaignmonitor.com >>> >>> >>> On 14 January 2014 10:46, Mohit Anchlia <[email protected]> wrote: >>> >>>> I am trying to understand why I should change it? This setting looks >>>> like the right setting in most cases. Did you see anything out of ordinary >>>> in that log message I pasted? >>>> >>>> On Mon, Jan 13, 2014 at 3:40 PM, David Pilato <[email protected]> wrote: >>>> >>>>> No it's not the default setting. >>>>> min master node = total num of nodes / 2 + 1 >>>>> >>>>> You have 5 nodes, 5 / 2 + 1 = 3 >>>>> >>>>> >>>>> >>>>> -- >>>>> *David Pilato* | *Technical Advocate* | *Elasticsearch.com* >>>>> @dadoonet <https://twitter.com/dadoonet> | >>>>> @elasticsearchfr<https://twitter.com/elasticsearchfr> >>>>> >>>>> >>>>> Le 14 janvier 2014 at 00:06:34, Mohit Anchlia >>>>> ([email protected]<//[email protected]>) >>>>> a écrit: >>>>> >>>>> Is the default setting 3? How do I go about selecting right >>>>> configuration setting for this property? >>>>> >>>>> On Mon, Jan 13, 2014 at 3:01 PM, David Pilato <[email protected]> wrote: >>>>> >>>>>> So I think you should first set minimum master node to 3. See >>>>>> http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/cluster-update-settings.html#_discovery >>>>>> >>>>>> Probably you need to close your isolated node and restart it. >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> *David Pilato* | *Technical Advocate* | *Elasticsearch.com* >>>>>> @dadoonet <https://twitter.com/dadoonet> | >>>>>> @elasticsearchfr<https://twitter.com/elasticsearchfr> >>>>>> >>>>>> >>>>>> Le 13 janvier 2014 at 23:58:33, Mohit Anchlia >>>>>> ([email protected]<//[email protected]>) >>>>>> a écrit: >>>>>> >>>>>> I have 5 nodes. I am using all the default settings. >>>>>> >>>>>> On Mon, Jan 13, 2014 at 2:32 PM, David Pilato <[email protected]>wrote: >>>>>> >>>>>>> It sounds like a split brain issue or something. >>>>>>> >>>>>>> How many nodes do you have? >>>>>>> Did you set minimum master node? >>>>>>> >>>>>>> -- >>>>>>> *David Pilato* | *Technical Advocate* | *Elasticsearch.com* >>>>>>> @dadoonet <https://twitter.com/dadoonet> | >>>>>>> @elasticsearchfr<https://twitter.com/elasticsearchfr> >>>>>>> >>>>>>> >>>>>>> Le 13 janvier 2014 at 22:48:32, Mohit Anchlia ( >>>>>>> [email protected] <//[email protected]>) a écrit: >>>>>>> >>>>>>> Thanks! It looks like one of the nodes even though it was up >>>>>>> still it went out of cluster. Is there no retry? >>>>>>> >>>>>>> >>>>>>> [2014-01-02 17:55:01,148][INFO ][cluster.service ] [10.80.140.14] >>>>>>> master {new >>>>>>> [10.80.140.14][267foffDRhO6zzXlHg3YKA][inet[/10.80.140.14:9300]]{group=group1}, >>>>>>> previous >>>>>>> [10.80.140.59][YDHawZWnRUKukXDIIT5MJQ][inet[/10.80.140.59:9300]]{group=group2}}, >>>>>>> removed >>>>>>> {[10.80.140.59][YDHawZWnRUKukXDIIT5MJQ][inet[/10.80.140.59:9300]]{group=group2},}, >>>>>>> reason: zen-disco-master_failed >>>>>>> ([10.80.140.59][YDHawZWnRUKukXDIIT5MJQ][inet[/10.80.140.59:9300 >>>>>>> ]]{group=group2}) >>>>>>> >>>>>>> [2014-01-02 17:55:02,158][INFO ][cluster.service ] [10.80.140.14] >>>>>>> removed >>>>>>> {[10.80.140.13][6cf39fcASKSn6dNNsSXguA][inet[/10.80.140.13:9300]]{group=group2},}, >>>>>>> reason: >>>>>>> zen-disco-node_failed([10.80.140.13][6cf39fcASKSn6dNNsSXguA][inet[/10.80.140.13:9300]]{group=group2}), >>>>>>> reason failed to ping, tried [3] times, each with maximum [30s] timeout >>>>>>> >>>>>>> >>>>>>> On Mon, Jan 13, 2014 at 1:34 PM, David Pilato <[email protected]>wrote: >>>>>>> >>>>>>>> Yellow means that some replicas are not allocated. >>>>>>>> If you have only one node and have index set with one replica >>>>>>>> (default), yellow is the expected state. >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> *David Pilato* | *Technical Advocate* | *Elasticsearch.com* >>>>>>>> @dadoonet <https://twitter.com/dadoonet> | >>>>>>>> @elasticsearchfr<https://twitter.com/elasticsearchfr> >>>>>>>> >>>>>>>> >>>>>>>> Le 13 janvier 2014 at 22:30:23, Mohit Anchlia ( >>>>>>>> [email protected] <//[email protected]>) a écrit: >>>>>>>> >>>>>>>> Cluster state is showing yellow. What's the best way to find why >>>>>>>> it's in yellow state? >>>>>>>> >>>>>>>> It has been up and stable so far except when I looked today it >>>>>>>> shows state turned into yellow. >>>>>>>> -- >>>>>>>> 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 [email protected]. >>>>>>>> To view this discussion on the web visit >>>>>>>> https://groups.google.com/d/msgid/elasticsearch/CAOT3TWpSSEVTpYA-DB8Hgfyo9WdR4bVRoKtQ9c_PC%2BFZ1aQiKg%40mail.gmail.com >>>>>>>> . >>>>>>>> For more options, visit 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 [email protected]. >>>>>>>> To view this discussion on the web visit >>>>>>>> https://groups.google.com/d/msgid/elasticsearch/etPan.52d45be9.7c3dbd3d.376c%40MacBook-Air-de-David.local. >>>>>>>> >>>>>>>> >>>>>>>> For more options, visit 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 [email protected]. >>>>>>> To view this discussion on the web visit >>>>>>> https://groups.google.com/d/msgid/elasticsearch/CAOT3TWpLn_AgMKcTwQuGD-CHHe6ptg%3DRxaNGLPxFn3kroed%3DVQ%40mail.gmail.com. >>>>>>> >>>>>>> >>>>>>> For more options, visit 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 [email protected]. >>>>>>> To view this discussion on the web visit >>>>>>> https://groups.google.com/d/msgid/elasticsearch/etPan.52d46968.5577f8e1.376c%40MacBook-Air-de-David.local. >>>>>>> >>>>>>> >>>>>>> For more options, visit 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 [email protected]. >>>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/elasticsearch/CAOT3TWrsU-k9u6hir2CWoobhnaOTD_3Bjk3Xf_ZjMDSBkB0DeQ%40mail.gmail.com. >>>>>> >>>>>> >>>>>> For more options, visit 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 [email protected]. >>>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/elasticsearch/etPan.52d47036.77465f01.376c%40MacBook-Air-de-David.local. >>>>>> >>>>>> >>>>>> For more options, visit 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 [email protected]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/elasticsearch/CAOT3TWqbrUh5p2t74Bc_6kL%3DxjAcLGrJzJ6wt_fRQqy6Dj-DKg%40mail.gmail.com >>>>> . >>>>> >>>>> For more options, visit 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 [email protected]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/elasticsearch/etPan.52d47982.5e884adc.376c%40MacBook-Air-de-David.local >>>>> . >>>>> >>>>> For more options, visit 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 [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/elasticsearch/CAOT3TWqx_KLF_p8nJ4m3On-nSvRncY9OdHa8KS1HDjcRHhfQhQ%40mail.gmail.com >>>> . >>>> >>>> For more options, visit 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 [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/elasticsearch/CAEM624aGEw8HqnMP--Fb-U%2BCjB58VBFb1bQenk_RmenNKAmMHg%40mail.gmail.com >>> . >>> >>> For more options, visit 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 [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/elasticsearch/CAOT3TWrGJOS4%2BA6bm%3DKLm7aTDoQxX8TZGM7CgxVoGAeO%3D-XNLA%40mail.gmail.com >> . >> >> For more options, visit 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/CAEM624Z-OGv6nJpwB6OyNjX1wf%3Dk1n9J7BrB_M33X8dYkLVSYw%40mail.gmail.com > . > > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. 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