Exception retrieving total swap space size – 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 retrieve the total swap space size from the operating system. This could be due to insufficient permissions, or an issue with the operating system itself. To resolve this issue, you can try running OpenSearch with administrative privileges, or check the operating system’s configuration to ensure it’s correctly reporting swap space. If the problem persists, consider disabling swap space check in OpenSearch settings, but be aware this could impact performance.

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This guide will help you check for common problems that cause the log ” exception retrieving total swap space size ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: monitor.

Log Context

Log “exception retrieving total swap space size” classname is OsProbe.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                logger.debug("OS reported a negative total swap space size [{}]"; mem);
                return 0;
            return mem;
        } catch (Exception e) {
            logger.warn("exception retrieving total swap space size"; e);
            return 0;



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