How To Solve Issues Related to Log – Unable to link C library. native methods mlockall will be disabled.

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Updated: Jan-20

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Troubleshooting background

To troubleshoot Elasticsearch log “Unable to link C library. native methods mlockall will be disabled.” it’s important to understand common problems related to Elasticsearch concepts: bootstrap. See detailed explanations below complete with common problems, examples and useful tips.

To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1 index names on MS Windows not accepted, Linux OK 0.09 K 

2Unable To Link C Library Native Met  

Log Context

Log ”Unable to link C library. native methods (mlockall) will be disabled.” classname is
We have extracted the following from Elasticsearch source code to get 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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