Failed to send failed shard to – How to solve related issues

Opster Team

Feb-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 ” Failed to send failed shard to ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster 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 “failed to send failed shard to {}” classname is ShardStateAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         ShardRoutingEntry shardRoutingEntry = new ShardRoutingEntry(shardRouting; indexUUID; message; failure);
        transportService.sendRequest(masterNode;
                SHARD_FAILED_ACTION_NAME; shardRoutingEntry; new EmptyTransportResponseHandler(ThreadPool.Names.SAME) {
                    
Override
                    public void handleException(TransportException exp) {
                        logger.warn("failed to send failed shard to {}"; exp; masterNode);
                    }
                });
    }

    public void shardStarted(final ShardRouting shardRouting; String indexUUID; final String reason) {



 

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