Error reading control group stats – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to read the statistics from the control group (cgroup) in a Linux system. This could be due to insufficient permissions or the cgroup not being properly configured. To resolve this issue, you can check the permissions of the cgroup files and ensure that OpenSearch has the necessary access. Alternatively, you can verify the cgroup configuration and make sure it’s set up correctly. If the error persists, consider disabling the cgroup functionality in OpenSearch if it’s not essential for your use case.

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This guide will help you check for common problems that cause the log ” error reading control group stats ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: monitor.

Log Context

Log “error reading control group stats” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        } catch (final IOException e) {
            logger.debug("error reading control group stats"; e);
            return null;

    private static class OsProbeHolder {


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