Failed to serialize cluster state before publishing it to node – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.3

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Briefly, this error occurs when OpenSearch is unable to serialize the cluster state before publishing it to a node. This could be due to a variety of reasons such as network issues, node unavailability, or data corruption. To resolve this issue, you can try the following: 1) Check the network connectivity between the nodes. 2) Ensure that the node is available and functioning properly. 3) Check for any data corruption in the cluster state and repair if necessary. 4) Restart the OpenSearch service to refresh the cluster state.

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This guide will help you check for common problems that cause the log ” failed to serialize cluster_state before publishing it to node {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: discovery, node.

Log Context

Log “failed to serialize cluster_state before publishing it to node {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        if (bytes == null) {
            try {
                bytes = serializeFullClusterState(clusterState; node.getVersion());
                serializedStates.put(node.getVersion(); bytes);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("failed to serialize cluster_state before publishing it to node {}"; node); e);
                sendingController.onNodeSendFailed(node; e);
        sendClusterStateToNode(clusterState; bytes; node; publishTimeout; sendingController; false; serializedStates);


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