Failed send response for shard active while trying to – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch is unable to send a response for an active shard due to network issues, shard corruption, or insufficient resources. To resolve this, you can try to restart the OpenSearch node, check the network connectivity, or allocate more resources to OpenSearch. If the shard is corrupted, you may need to restore it from a backup. Additionally, ensure that the OpenSearch cluster is properly configured and that there are no issues with the underlying hardware.

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This guide will help you check for common problems that cause the log ” failed send response for shard active while trying to ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: response, indices, shard.

Log Context

Log “failed send response for shard active while trying to” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                        public void sendResult(boolean shardActive) {
                            try {
                                channel.sendResponse(new ShardActiveResponse(shardActive; clusterService.localNode()));
                            } catch (IOException | OpenSearchRejectedExecutionException e) {
                                logger.error(() -> new ParameterizedMessage("failed send response for shard active while trying to " +
                                    "delete shard {} - shard will probably not be removed"; request.shardId); e);
                    }; newState -> {
                        // the shard is not there in which case we want to send back a false (shard is not active);


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