Failed to send failure while failing shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 5-5

Briefly, this error occurs when Elasticsearch is unable to communicate a shard failure to the master node. This could be due to network issues, the master node being overwhelmed or the shard being corrupted. To resolve this, you can try restarting the Elasticsearch cluster, checking the network connectivity, or relocating the shard to another node. If the shard is corrupted, you may need to restore it from a backup.

This guide will help you check for common problems that cause the log ” {} failed to send failure [{}] while failing shard [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster and shard.

Log Context

Log “{} failed to send failure [{}] while failing shard [{}]” classname is ShardStateAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                         logger.error((Supplier>) () -> new ParameterizedMessage("{} unexpected failure while failing shard [{}]"; request.shardId; request); e);
                        try {
                            channel.sendResponse(e);
                        } catch (Exception channelException) {
                            channelException.addSuppressed(e);
                            logger.warn((Supplier>) () -> new ParameterizedMessage("{} failed to send failure [{}] while failing shard [{}]"; request.shardId; e; request); channelException);
                        }
                    }

                    
Override
                    public void onNoLongerMaster(String source) {



 

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