An exception occurred formatting a READ trace message – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while formatting a READ trace message. This could be due to a bug in the software, a problem with the logging configuration, or an issue with the data being logged. To resolve this issue, you could try updating Elasticsearch to the latest version to fix any potential bugs. Alternatively, you could review and correct your logging configuration, or check the data being logged for any inconsistencies or errors that could be causing the problem.

This guide will help you check for common problems that cause the log ” an exception occurred formatting a READ trace message ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “an exception occurred formatting a READ trace message” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        if (logger.isTraceEnabled()) {
            try {
                String logMessage = format(channel; message; "READ");
            } catch (IOException e) {
                logger.warn("an exception occurred formatting a READ trace message"; e);

    static void logInboundMessage(TcpChannel channel; InboundMessage message) {


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?