Negative free memory found in memory stats – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8-8.9

Briefly, this error occurs when Elasticsearch’s JVM memory stats report negative free memory, which is an anomaly. This could be due to a bug in the JVM or the operating system’s reporting of memory usage. To resolve this issue, you can try updating your JVM to the latest version, as it may contain fixes for such bugs. Alternatively, you can monitor your system’s memory usage independently to ensure it’s not exceeding its limits. If the problem persists, consider contacting Elasticsearch support or your system administrator for further assistance.

This guide will help you check for common problems that cause the log ” negative free memory [{}] found in memory stats ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: monitor, memory.

Log Context

Log “negative free memory [{}] found in memory stats” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            if (adjustedTotal 


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