No eligible remote nodes found to perform balancing – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.4-2.6

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Briefly, this error occurs when OpenSearch cannot find any suitable remote nodes to balance the load. This could be due to network issues, node failures, or misconfiguration. To resolve this, ensure all nodes are correctly configured and connected to the network. Check the health of your nodes and replace any that are failing. Also, review your shard allocation settings and adjust them if necessary to allow for better load balancing. Lastly, ensure your cluster has enough nodes to handle the load.

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This guide will help you check for common problems that cause the log ” No eligible remote nodes found to perform balancing ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster, allocation, routing.

Log Context

Log “No eligible remote nodes found to perform balancing” classname is RemoteShardsBalancer.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    void balance() {
        List remoteRoutingNodes = getRemoteRoutingNodes();
        logger.trace("Performing balancing for remote shards.");

        if (remoteRoutingNodes.isEmpty()) {
            logger.info("No eligible remote nodes found to perform balancing");
            return;
        }

        ObjectIntHashMap nodePrimaryShardCount = calculateNodePrimaryShardCount(remoteRoutingNodes);
        int totalPrimaryShardCount = Arrays.stream(nodePrimaryShardCount.values).sum();

 

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