Unexpected failure during cluster state update – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to update the cluster state due to issues like network problems, insufficient resources, or a faulty node. To resolve this, you can check the network connectivity between nodes, ensure there are enough resources (CPU, memory, disk space) for the operation, and inspect the logs to identify any faulty nodes. If a node is found to be problematic, you may need to restart or replace it. Also, ensure that the cluster state is not too large by limiting the number of indices and shards.

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

Log Context

Log “Unexpected failure during cluster state update” classname is SnapshotsService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            } else {
                assert false : new AssertionError(
                    "Modifying snapshot state should only ever fail because we failed to publish new state";
                logger.error("Unexpected failure during cluster state update"; e);


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