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

Opster Team

Aug-23, Version: 7.8-8.9

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Briefly, this error occurs when Elasticsearch encounters an issue while trying to format a trace message for a write operation. This could be due to a variety of reasons such as incorrect configuration, insufficient resources, or a bug in the system. To resolve this issue, you could try the following: 1) Check and correct your Elasticsearch configuration settings, 2) Ensure that your system has enough resources (CPU, memory, disk space), 3) Update Elasticsearch to the latest version to fix any potential bugs, and 4) Review the trace logs for more detailed information about the error.

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This guide will help you check for common problems that cause the log ” an exception occurred formatting a WRITE 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 WRITE trace message” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                BytesReference withoutHeader = message.slice(HEADER_SIZE; message.length() - HEADER_SIZE);
                String logMessage = format(channel; withoutHeader; "WRITE");
            } catch (IOException e) {
                logger.warn("an exception occurred formatting a WRITE trace message"; e);

    private static String format(TcpChannel channel; BytesReference message; String event) throws IOException {


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