Unable to link C library native methods mlockall will be disabled – 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 link to the C library, which disables the native methods like mlockall. This could be due to missing or incompatible C library versions. To resolve this, ensure that the C library is properly installed and the version is compatible with your OpenSearch version. If the issue persists, you may need to recompile OpenSearch with the correct C library. Also, check the permissions and paths to the C library to ensure OpenSearch can access it.

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This guide will help you check for common problems that cause the log ” unable to link C library. native methods (mlockall) will be disabled. ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: bootstrap.

Log Context

Log “unable to link C library. native methods (mlockall) will be disabled.” classname is JNACLibrary.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    static {
        try {
        } catch (UnsatisfiedLinkError e) {
            logger.warn("unable to link C library. native methods (mlockall) will be disabled."; e);

    static native int mlockall(int flags);


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