Using discovery type and seed hosts providers – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to find or connect to the specified seed hosts for cluster formation. This could be due to incorrect configuration of the discovery settings or network connectivity issues. To resolve this, ensure that the discovery settings are correctly configured in the opensearch.yml file. Check the network connectivity between the nodes. Also, verify that the seed hosts are up and running. If you’re using a firewall, ensure that it’s not blocking the communication between the nodes.

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This guide will help you check for common problems that cause the log ” using discovery type [{}] and seed hosts providers {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: discovery, hosts.

Log Context

Log “using discovery type [{}] and seed hosts providers {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        } else {
            throw new IllegalArgumentException("Unknown discovery type [" + discoveryType + "]");
        }"using discovery type [{}] and seed hosts providers {}"; discoveryType; seedProviderNames);

    private List getSeedProviderNames(Settings settings) {
        if (LEGACY_DISCOVERY_HOSTS_PROVIDER_SETTING.exists(settings)) {
            if (DISCOVERY_SEED_PROVIDERS_SETTING.exists(settings)) {


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