Unable to lock JVM Memory error= reason= – 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 lock the JVM memory due to insufficient system resources or incorrect configuration. This can lead to performance issues as the JVM may swap out memory to disk. To resolve this, ensure your system has enough free memory. You can also adjust the ‘bootstrap.memory_lock’ setting in the OpenSearch configuration file to ‘true’ to enable memory locking. Additionally, check your user permissions, as the user running OpenSearch needs permission to lock memory. Lastly, consider increasing the system limits on locked memory.

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This guide will help you check for common problems that cause the log ” Unable to lock JVM Memory: error={}; reason={} ” 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 lock JVM Memory: error={}; reason={}” classname is JNANatives.java.
We extracted the following from OpenSearch 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={}; reason={}"; errno; 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: {}; hard limit: {}";

 

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