EC2 discovery - cannot detect different box type

[toughrogrammer (Jung Juhong)]

I'm using ec2 discovery plugin to detect master node.
I'm trying hot-warm architecture, so I started serveral nodes with node.attr.box_type: hot.
And then I start new node with node.attr.box_type: warm, this new node cannot detect master node what box type is hot.
But when i modified configurations that don't use discovery plugin and use host address manually, it worked.

ec2 discovery plugin don't work for hot-warm architecture?
My elasitcsearch version is 6.5.1.
Here is warning log about discovery.

[2018-12-27T03:58:01,329][WARN ][o.e.d.z.ZenDiscovery     ] [$private-ip] not enough master nodes discovered during pinging (found [[Candidate{node={$private-ip}{Zffsn6seS1KfQQkb7X9tiQ}{jyd1AMQjRfO68cBzsHpfhA}{$private-ip}{$private-ip:9300}{ml.machine_memory=64389091328, box_type=warm, xpack.installed=true, ml.max_open_jobs=20, ml.enabled=true}, clusterStateVersion=-1}]], but needed [3]), pinging again

[DavidTurner]

@toughrogrammer

ec2 discovery plugin don't work for hot-warm architecture?

The two things are quite independent, and certainly do work together if correctly configured. The ec2-discovery plugin queries the EC2 API for the IP addresses of the other nodes in the cluster. It sounds like your new nodes are not configured correctly.

[toughrogrammer (Jung Juhong)]

It looks like ec2-discovery plugin queries EC2 with box type attribute.
If configurations is wrong, why it could detect master node when I wrote hot node's host at discovery.zen.ping.unicast.hosts ?
My hot nodes are already detecting each others well with ec2-discovery plugin.

[DavidTurner]

Node attributes (such as your box_type attribute) are specific to Elasticsearch and EC2 does not know about them. The settings for the ec2-discovery plugin affect how discovery works, particularly the groups, host_type and availability_zones settings. It'd help if you could share your configuration and any log messages. You could also try setting logger.org.elasticsearch.discovery.ec2: TRACE to get a lot more detail about the discovery process.