Exception in remote request to master – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.5-8.9

Briefly, this error occurs when a node in the Elasticsearch cluster fails to communicate with the master node. This could be due to network issues, high load on the master node, or the master node being down. To resolve this, you can check the network connectivity between the nodes, ensure the master node is up and running, and monitor the load on the master node. If the load is consistently high, consider adding more nodes to the cluster or increasing the resources of the master node.

This guide will help you check for common problems that cause the log ” Exception in remote request to master ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: master, cluster, request.

Log Context

Log “Exception in remote request to master” classname is CoordinationDiagnosticsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                TimeValue.timeValueMillis(endTimeMillis - startTimeMillis)
            responseConsumer.accept(responseTransformationFunction.apply(response; null));
        }; e -> {
            logger.warn("Exception in remote request to master" + masterEligibleNode; e);
            responseConsumer.accept(responseTransformationFunction.apply(null; e));

        return transportService.getThreadPool().schedule(new Runnable() {


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