Error during segment replication – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.9-2.9

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Briefly, this error occurs when OpenSearch is unable to replicate a segment, which is a part of an index, across the nodes in a cluster. This could be due to network issues, insufficient disk space, or a faulty node. To resolve this, you can check the network connectivity between nodes, ensure there’s enough disk space, and verify the health of all nodes. If a specific node is consistently causing issues, consider removing and re-adding it to the cluster. Also, check the OpenSearch logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” Error during segment replication; {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices, replication.

Log Context

Log “Error during segment replication; {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


        public void onFailure(Exception e) {
            try (final ReplicationRef ref = onGoingReplications.get(replicationId)) {
                logger.error(() -> new ParameterizedMessage("Error during segment replication; {}"; ref.get().description()); e);
  ; new ReplicationFailedException("Unexpected Error during replication"; e); false);



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