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Briefly, this error occurs when the total size of warning headers in OpenSearch exceeds the maximum limit allowed. This could be due to a large number of warnings generated by your queries or operations. To resolve this issue, you can either increase the maximum allowed size of warning headers in the OpenSearch settings or optimize your queries and operations to reduce the number of warnings generated. Additionally, you can also monitor your logs regularly to identify and fix issues that are causing these warnings.
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This guide will help you check for common problems that cause the log ” Dropping a warning header; as their total size reached the maximum allowed of [ ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .
Log Context
Log “Dropping a warning header; as their total size reached the maximum allowed of [” classname is ThreadContext.java.
We extracted the following from OpenSearch source code for those seeking 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;
