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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue while trying to format a READ trace message, possibly due to a problem with the logging system or a bug in the software. To resolve this, you could try updating OpenSearch to the latest version to ensure any known bugs are fixed. If the problem persists, check the configuration of your logging system to ensure it’s set up correctly. Additionally, you could enable detailed logging to get more information about the error, which could help identify the root cause.

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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 OpenSearch concepts: .

Log Context

Log “an exception occurred formatting a READ trace message” classname is
We extracted the following from OpenSearch 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) {


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