How To Solve Issues Related to Log – Dropping a warning header; as their total size reached the maximum allowed of

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Updated: Jan-20

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Troubleshooting background

To troubleshoot Elasticsearch log “Dropping a warning header; as their total size reached the maximum allowed of” it’s important to understand common problems related to Elasticsearch concepts: thread. See detailed explanations below complete with common problems, examples and useful tips.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1 Nx Upload Client Max Body Size Issu  

2 Hon Maximum Recursion Depth Exceede    


Log Context

Log ”Dropping a warning header; as their total size reached the maximum allowed of [“ classname is ThreadContext.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

             assert value != null;
            long newWarningHeaderSize = warningHeadersSize;
            //check if we can add another warning header - if max size within limits
            if (key.equals("Warning") && (maxWarningHeaderSize != -1)) { //if size is NOT unbounded; check its limits
                if (warningHeadersSize > maxWarningHeaderSize) { // if max size has already been reached before
                    logger.warn("Dropping a warning header; as their total size reached the maximum allowed of ["
                            + maxWarningHeaderSize + "] bytes set in ["
                            + HttpTransportSettings.SETTING_HTTP_MAX_WARNING_HEADER_SIZE.getKey() + "]!");
                    return this;
                }
                newWarningHeaderSize += "Warning".getBytes(StandardCharsets.UTF_8).length + value.getBytes(StandardCharsets.UTF_8).length;






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