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Briefly, this error occurs when OpenSearch cannot find a response handler for a specific transport request. This usually happens when the node that made the request has left the cluster before the response is returned, or due to network issues causing the response to be delayed or lost. To resolve this, you can check the network connectivity between your nodes, ensure that your cluster is stable and nodes are not frequently leaving or joining. Also, consider increasing the timeout settings if your requests are taking longer than expected.
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This guide will help you check for common problems that cause the log ” Transport response handler not found of id [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: response, handler.
Log Context
Log “Transport response handler not found of id [{}]” classname is TransportService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
requestId
);
action = timeoutInfoHolder.action();
sourceNode = timeoutInfoHolder.node();
} else {
logger.warn("Transport response handler not found of id [{}]"; requestId);
action = null;
sourceNode = null;
}
// call tracer out of lock
if (tracerLog.isTraceEnabled() == false) {
