Rotate keys on master – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Rotate keys on master ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: master and plugin.

Log Context

Log “Rotate keys on master” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

     synchronized String getActiveKeyHash() {
        return new BytesRef(Base64.getUrlEncoder().withoutPadding().encode(this.keyCache.currentTokenKeyHash.bytes)).utf8ToString();

    void rotateKeysOnMaster(ActionListener listener) {"rotate keys on master");
        TokenMetaData tokenMetaData = generateSpareKey();
        clusterService.submitStateUpdateTask("publish next key to prepare key rotation";
                new TokenMetadataPublishAction(
                        ActionListener.wrap((res) -> {
                            if (res.isAcknowledged()) {


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