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.
This guide will help you check for common problems that cause the log ” Failed to notify response handler on exception ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: handler and response.
Log Context
Log “failed to notify response handler on exception” classname is TransportService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
// if we get rejected during node shutdown we don't wanna bubble it up
logger.debug("failed to notify response handler on rejection"; t);
}
Override
public void onFailure(Throwable t) {
logger.warn("failed to notify response handler on exception"; t);
}
Override
protected void doRun() throws Exception {
holderToNotify.handler().handleException(sendRequestException);
}
