GetFreePhysicalMemorySize is not available – 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 access the system’s free physical memory size. This could be due to restrictions in the operating system or the JVM not having the necessary permissions. To resolve this issue, you can try running OpenSearch with a user that has sufficient system permissions. Alternatively, you can disable the memory check by setting the environment variable “OPENSEARCH_JAVA_OPTS” to “-XX:-MaxFDLimit”. However, be aware that this might lead to performance issues if your system does not have enough free memory.

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This guide will help you check for common problems that cause the log ” getFreePhysicalMemorySize is not available ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: memory, monitor.

Log Context

Log “getFreePhysicalMemorySize is not available” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

     * Returns the amount of free physical memory in bytes.
    public long getFreePhysicalMemorySize() {
        if (getFreePhysicalMemorySize == null) {
            logger.warn("getFreePhysicalMemorySize is not available");
            return 0;
        try {
            final long freeMem = (long) getFreePhysicalMemorySize.invoke(osMxBean);
            if (freeMem 


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