Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.
To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them. Take a self-guided product tour to see for yourself (no registration required).
This guide will help you check for common problems that cause the log ” Dropping a warning header; as their total count reached the maximum allowed of ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: thread.
Log Context
Log “Dropping a warning header; as their total count reached the maximum allowed of [” classname is ThreadContext.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
//check if we can add another warning header - if max count within limits
if ((key.equals("Warning")) && (maxWarningHeaderCount != -1)) { //if count is NOT unbounded; check its limits
final int warningHeaderCount = newResponseHeaders.containsKey("Warning") ? newResponseHeaders.get("Warning").size() : 0;
if (warningHeaderCount > maxWarningHeaderCount) {
logger.warn("Dropping a warning header; as their total count reached the maximum allowed of ["
+ maxWarningHeaderCount + "] set in ["
+ HttpTransportSettings.SETTING_HTTP_MAX_WARNING_HEADER_COUNT.getKey() + "]!");
return this;
}
}
Find & fix Elasticsearch problems
