Unable to retrieve node FS stats for – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.

Briefly, this error occurs when OpenSearch is unable to fetch the file system (FS) statistics for a specific node. This could be due to insufficient permissions, network issues, or the node being down. To resolve this, ensure that OpenSearch has the necessary permissions to access the file system. Check the network connectivity between the nodes and verify that the node in question is up and running. If the issue persists, consider restarting the node or the entire OpenSearch cluster.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” Unable to retrieve node FS stats for {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster, node.

Log Context

Log “Unable to retrieve node FS stats for {}” classname is InternalClusterInfoService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        final Map newLeastAvailableUsages;
        final Map newMostAvailableUsages
    ) {
        for (NodeStats nodeStats : nodeStatsArray) {
            if (nodeStats.getFs() == null) {
                logger.warn("Unable to retrieve node FS stats for {}"; nodeStats.getNode().getName());
            } else {
                FsInfo.Path leastAvailablePath = null;
                FsInfo.Path mostAvailablePath = null;
                for (FsInfo.Path info : nodeStats.getFs()) {
                    if (leastAvailablePath == null) {


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch