Good point... actually it looks like the 'head' plugin is misreporting a yellow status when replicas=2:
<https://lh4.googleusercontent.com/-nv6MfIzqKuk/VK2x3_VXgsI/AAAAAAAAASI/EzZ5Ejrw4yo/s1600/cluster-status-with-2-replicas.png> Because when I access the _cluster/health endpoint, a status of red is returned: { "cluster_name": "KR_elasticsearch_PROD", "status": "red", "timed_out": false, "number_of_nodes": 1, "number_of_data_nodes": 1, "active_primary_shards": 0, "active_shards": 0, "relocating_shards": 0, "initializing_shards": 0, "unassigned_shards": 75 } So you're correct that the cluster cannot be yellow with primaries unassigned. However would still be good to know why ES would refuse to allocate primary shards if the number of replicas exceeds the number of nodes. Cheers, Mat On Thursday, January 8, 2015 10:03:51 AM UTC+13, Mark Walkom wrote: > > A cluster cannot be yellow if any primaries are unassigned. Are you sure > it's yellow before you set replica's to 0? > > On 8 January 2015 at 06:52, Mathew D <[email protected] <javascript:>> > wrote: > >> I understand there's no point assigning primaries *and* replicas to a >> single node, but in my case ES won't even allocate a primary (until I >> reduce the number of replicas) >> >> >> On Wednesday, January 7, 2015 4:58:58 PM UTC+13, Mark Walkom wrote: >>> >>> It's not recommended to run an Elasticsearch cluster across >>> geographically dispersed locations. >>> >>> You cannot assign both primaries and replicas to a single node, it >>> defeats the purpose! So it's as design. >>> >>> On 7 January 2015 at 14:08, Mathew D <[email protected]> wrote: >>> >>>> Hi all, >>>> >>>> I've encountered some unexpected behaviour during my DR testing which >>>> I'm trying to explain. >>>> >>>> I have a 3-node geographically-separated cluster with the following >>>> settings: >>>> >>>> - index.number_of_shards=5 >>>> - index.number_of_replicas=2 >>>> - discovery.zen.minimum_master_nodes: 2 >>>> >>>> I use number_of_replicas=2 for durability, so that each node will >>>> contain a full set to data (meaning I can lose 2 of my 3 nodes without >>>> losing any data). >>>> >>>> However I am finding that if I shut down 2 nodes, after adjusting >>>> minimum_master_nodes on the remaining node to 1 and restarting that node, >>>> the cluster stays yellow with all shards unassigned. They remain in the >>>> unassigned state until I manually reduce number_of_replicas to down 1 or >>>> 0. Once number_of_replicas <= number of nodes, the shards reassign and >>>> the >>>> cluster goes green. Just wondering if this behaviour is as designed? >>>> >>>> Regards, >>>> Mat >>>> >>>> >>>> >>>> -- >>>> 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/abb0e7cd-c11a-4914-a98f-70d68c1d17be% >>>> 40googlegroups.com >>>> <https://groups.google.com/d/msgid/elasticsearch/abb0e7cd-c11a-4914-a98f-70d68c1d17be%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 [email protected] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/elasticsearch/74ae6254-e4c5-4504-8bee-cd337666bea4%40googlegroups.com >> >> <https://groups.google.com/d/msgid/elasticsearch/74ae6254-e4c5-4504-8bee-cd337666bea4%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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/fbbf2012-5d5f-42f4-b388-762a997b8fc9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
