WARN o.e.c.s.ElasticsearchNodesSniffer - unknown role [ml] on node <name>

bobbyi · February 26, 2020, 5:48pm

We have an API server using version 7.5.1 of the elasticsearch-rest-high-level-client and elasticsearch-rest-client-sniffer Java libraries, which matches the version of ES used on our cluster. It is working fine, but our application log ends up filled with messages saying
WARN o.e.c.s.ElasticsearchNodesSniffer - unknown role [ml] on node <name>

This application is just running queries and doesn't need or care about the ml functionality in ES.

How do I get this message to stop being generated? Also, why is it happening? Shouldn't this version of the sniffer understand all of the roles that the matching version of ES has?

DavidTurner · February 26, 2020, 6:33pm

I think this is a bug. The ElasticsearchNodesSniffer only knows about the three core roles:

github.com

elastic/elasticsearch/blob/bbbdf949a9d63dbc795ce8dd7dbd529d5f40b98b/client/sniffer/src/main/java/org/elasticsearch/client/sniff/ElasticsearchNodesSniffer.java#L209-L222


while (parser.nextToken() != JsonToken.END_ARRAY) {
    switch (parser.getText()) {
    case "master":
        master = true;
        break;
    case "data":
        data = true;
        break;
    case "ingest":
        ingest = true;
        break;
    default:
        logger.warn("unknown role [" + parser.getText() + "] on node [" + nodeId + "]");
    }

IOW it was not updated when node roles became pluggable. Would you open an issue on Github about it?

In the meantime, the only workaround I can see is to set the org.elasticsearch.client.sniff.ElasticsearchNodesSniffer logger to ERROR to suppress this WARN-level log. I don't think you lose anything useful from this logger.

bobbyi · February 27, 2020, 2:25am

Thanks. Here is the issue I filed on Github:

system · March 26, 2020, 2:25am

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