Creating NettyAllocator with the following configs – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.9-8.9

Briefly, this error occurs when Elasticsearch is initializing the Netty networking layer with specific configurations. It’s not an error message but an informational log indicating the settings for NettyAllocator, which is responsible for allocating and deallocating buffers in Elasticsearch. If you’re experiencing issues, they might be related to these settings. To resolve, you can adjust the Netty settings in your Elasticsearch configuration, such as reducing the buffer sizes if you’re running out of memory, or increasing them if you’re experiencing slow network performance. Always ensure your settings are optimized for your specific use case and system resources.

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 Elasticsearch concepts: netty.

Log Context

Log “creating NettyAllocator with the following configs: ” classname is
We extracted the following from Elasticsearch 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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