Cannot mlockall because JNA is not available – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your Elasticsearch operation.

Briefly, this error occurs when Elasticsearch is unable to lock the process’s address space into RAM, due to the Java Native Access (JNA) library not being available. This can lead to swapping and degrade Elasticsearch performance. To resolve this issue, ensure that the JNA library is installed and available to Elasticsearch. If it’s already installed, check the library’s permissions and the Elasticsearch user’s permissions. Alternatively, you can disable memory swapping in Elasticsearch, but this could potentially lead to out-of-memory errors.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” cannot mlockall because JNA is not available ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: bootstrap.

Log Context

Log “cannot mlockall because JNA is not available” classname is Natives.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        JNA_AVAILABLE = v;
    }

    static void tryMlockall() {
        if (JNA_AVAILABLE == false) {
            logger.warn("cannot mlockall because JNA is not available");
            return;
        }
        JNANatives.tryMlockall();
    }

 

How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?