Unexpected failure while sending request – How to solve related issues

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Unexpected failure while sending request – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Unexpected failure while sending request ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, request and shard.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Unexpected failure while sending request [{}]” classname is ShardStateAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     
Override
                    public void handleException(TransportException exp) {
                        if (isMasterChannelException(exp)) {
                            waitForNewMasterAndRetry(actionName; observer; request; listener; changePredicate);
                        } else {
                            logger.warn(new ParameterizedMessage("unexpected failure while sending request [{}]" +
                                " to [{}] for shard entry [{}]"; actionName; masterNode; request); exp);
                            listener.onFailure(exp instanceof RemoteTransportException ?
                                (Exception) (exp.getCause() instanceof Exception ? exp.getCause() :
                                    new ElasticsearchException(exp.getCause())) : exp);
                        }



 

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