Unable to retrieve max number of threads JNACLibrary strerror Native getLastError – 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 retrieve the maximum number of threads that can be created by the system. This could be due to insufficient system resources or a misconfiguration. To resolve this issue, you can try increasing the system limits for the number of threads, ensuring that the system has enough resources (like memory and CPU), or checking the OpenSearch configuration for any errors. If the problem persists, consider consulting with a system administrator or a professional with expertise in OpenSearch.

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This guide will help you check for common problems that cause the log ” unable to retrieve max number of threads [” + JNACLibrary.strerror(Native.getLastError()) + “] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: threads, bootstrap.

Log Context

Log “unable to retrieve max number of threads [” + JNACLibrary.strerror(Native.getLastError()) + “]” classname is JNANatives.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            final JNACLibrary.Rlimit rlimit = new JNACLibrary.Rlimit();
            if (JNACLibrary.getrlimit(rlimit_nproc; rlimit) == 0) {
                MAX_NUMBER_OF_THREADS = rlimit.rlim_cur.longValue();
            } else {
                logger.warn("unable to retrieve max number of threads [" + JNACLibrary.strerror(Native.getLastError()) + "]");

    static void trySetMaxSizeVirtualMemory() {


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