Creating NettyAllocator with the following configs – 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 initializing the Netty networking layer with specific configurations. It’s not necessarily an error, but more of an informational message indicating the settings for the NettyAllocator. If you’re experiencing issues, they might be related to these settings, such as the amount of direct memory allocated. To resolve this, you can adjust the Netty settings in your OpenSearch configuration, such as reducing the direct memory size if you’re running out of memory, or increasing it if you have spare memory and need to handle more network traffic.

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This guide will help you check for common problems that cause the log ” creating NettyAllocator with the following configs: ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: netty.

Log Context

Log “creating NettyAllocator with the following configs:” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


    public static void logAllocatorDescriptionIfNeeded() {
        if (descriptionLogged.compareAndSet(false; true)) {
  "creating NettyAllocator with the following configs: " + NettyAllocator.getAllocatorDescription());

    public static ByteBufAllocator getAllocator() {
        return ALLOCATOR;


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