Failed to notify ClusterStateListener – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to notify a ClusterStateListener, which is a component that listens for changes in the cluster state. This could be due to network issues, node failures, or resource constraints. To resolve this issue, you can try restarting the nodes, checking the network connectivity between nodes, or increasing system resources like memory or CPU. Additionally, ensure that your OpenSearch version is up-to-date as this could also be a bug that has been fixed in a newer version.

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This guide will help you check for common problems that cause the log ” failed to notify ClusterStateListener ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster.

Log Context

Log “failed to notify ClusterStateListener” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                logger.trace("calling [{}] with change to version [{}]"; listener; clusterChangedEvent.state().version());
                try (TimingHandle ignored = stopWatch.timing("notifying listener [" + listener + "]")) {
            } catch (Exception ex) {
                logger.warn("failed to notify ClusterStateListener"; ex);

    private static class SafeClusterApplyListener implements ClusterApplyListener {


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