Replication failure – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.3-2.8

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Briefly, this error occurs when OpenSearch is unable to replicate data across multiple nodes in a cluster. This could be due to network issues, disk space problems, or configuration errors. To resolve this, you can check the network connectivity between nodes, ensure there’s enough disk space on all nodes, and verify the replication settings in your OpenSearch configuration. Additionally, check the OpenSearch logs for more detailed error messages that can help pinpoint the exact issue.

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

Log Context

Log “replication failure” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                        if (sendShardFailure == true) {
                            logger.error("replication failure"; e);
                            replicaShard.failShard("replication failure"; e);


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