Failure occurred while dumping connection for decommission nodes – – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.4-2.9

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Briefly, this error occurs when OpenSearch attempts to remove or decommission nodes from the cluster but fails due to issues like network problems, insufficient permissions, or node unavailability. To resolve this, ensure that the network connection between nodes is stable and reliable. Check if the nodes are available and functioning properly. Also, verify that OpenSearch has the necessary permissions to decommission nodes. If the issue persists, consider restarting the nodes or the entire OpenSearch cluster.

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This guide will help you check for common problems that cause the log ” Failure occurred while dumping connection for decommission nodes – ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster.

Log Context

Log “Failure occurred while dumping connection for decommission nodes -” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


                public void handleException(TransportException exp) {
                    logger.error("Failure occurred while dumping connection for decommission nodes - "; exp.unwrapCause());

                public String executor() {
                    return ThreadPool.Names.SAME;


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