Fail open executed due to exception – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.5-2.9

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Briefly, this error occurs when OpenSearch fails to open a file or execute a command due to an exception. This could be due to insufficient permissions, a missing file, or a system error. To resolve this issue, you could try the following: 1) Check the file path and ensure the file exists and is accessible. 2) Verify that OpenSearch has the necessary permissions to execute the command or open the file. 3) Look at the system logs to identify any underlying issues that may be causing the exception. 4) Restart the OpenSearch service to clear any temporary issues.

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This guide will help you check for common problems that cause the log ” {}: Fail open executed due to exception ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: routing, cluster.

Log Context

Log “{}: Fail open executed due to exception” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


        while (next != null && WeightedRoutingUtils.isWeighedAway(next.getNodeId(); clusterState)) {
            SearchShardTarget nextShard = next;
            if (canFailOpen(nextShard.getShardId(); shardIt.size(); exception; clusterState)) {
       -> new ParameterizedMessage("{}: Fail open executed due to exception"; nextShard.getShardId()); exception);
            next = shardIt.nextOrNull();


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