Decommissioning node with connections – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.4-2.9

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Briefly, this error occurs when you attempt to decommission a node in OpenSearch that still has active connections. This could be due to ongoing data transfers, queries, or other operations. To resolve this issue, you can either wait for the ongoing operations to complete or manually terminate them. However, be cautious as terminating operations can lead to data loss or inconsistency. Another solution is to reroute the connections to another node before decommissioning. Always ensure to monitor your nodes and their connections before making changes to avoid such errors.

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This guide will help you check for common problems that cause the log ” Decommissioning node with connections : [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster, node.

Log Context

Log “Decommissioning node with connections : [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        for (int i = 0; i  decommissionedNodes) {
        if (decommissionedNodes == null || decommissionedNodes.isEmpty()) {


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