Error while processing ack for node – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue while acknowledging a node during cluster communication. This could be due to network issues, node unavailability, or configuration errors. To resolve this, you can check the network connectivity between nodes, ensure all nodes are running and properly configured, and review OpenSearch logs for more detailed error information. If the issue persists, consider restarting the affected nodes or the entire cluster.

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This guide will help you check for common problems that cause the log ” error while processing ack for 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 “error while processing ack for node [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    private void onNodeAck(final Discovery.AckListener ackListener; DiscoveryNode node; Exception e) {
        try {
            ackListener.onNodeAck(node; e);
        } catch (Exception inner) {
            logger.debug(() -> new ParameterizedMessage("error while processing ack for node [{}]"; node); inner);


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