Unable to lock JVM Memory: error= – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

Briefly, this error occurs when Elasticsearch is unable to lock the JVM memory, which can cause performance problems or crashes. The error message will typically include additional information about the specific error that occurred. The most common cause of this error is that the operating system limits the amount of memory that a process can lock, which can be increased by increasing the RLIMIT_MEMLOCK setting. The user should consult the Elasticsearch documentation and the operating system documentation for instructions on how to increase this limit.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Unable to lock JVM Memory: error= ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: bootstrap.

Log Context

Log “Unable to lock JVM Memory: error=” classname is JNANatives.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             // this will have already been logged by CLibrary; no need to repeat it
            return;
        }

        // mlockall failed for some reason
        logger.warn("Unable to lock JVM Memory: error=" + errno + ";reason=" + errMsg);
        logger.warn("This can result in part of the JVM being swapped out.");
        if (errno == JNACLibrary.ENOMEM) {
            if (rlimitSuccess) {
                logger.warn("Increase RLIMIT_MEMLOCK; soft limit: " + rlimitToString(softLimit) + "; hard limit: " + rlimitToString(hardLimit));
                if (Constants.LINUX) {




 

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