Unknown mlockall 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.

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 ” Unknown mlockall error ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: bootstrap.

Log Context

Log “Unknown mlockall error” classname is JNANatives.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 logger.warn("Unable to lock JVM memory (ENOMEM)."
                        + " This can result in part of the JVM being swapped out."
                        + " Increase RLIMIT_MEMLOCK (ulimit).");
            } else if (!System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("mac")) {
                // OS X allows mlockall to be called; but always returns an error
                logger.warn("Unknown mlockall error " + errno);
            }
        }
    }

    static void tryVirtualLock() {




 

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