How To Solve Issues Related to Log – Unexpected failure while sending request

How To Solve Issues Related to Log – Unexpected failure while sending request

Updated: Jan-20

Elasticsearch Version: 1.7-8.0

Background

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To troubleshoot log “Unexpected failure while sending request” it’s important to understand a few problems related to Elasticsearch concepts cluster, request, shard. See bellow important tips and explanations on these concepts

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);
                        }



Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Corrupted Translog  

Github Issue Number 23199  

Request To Elasticsearch Failed/154

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