Exception thrown by listener while notifying on all nodes acked – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when a listener throws an exception during the process of acknowledging all nodes in an OpenSearch cluster. This could be due to network issues, node failures, or configuration problems. To resolve this, you can check the network connectivity between nodes, ensure all nodes are functioning properly, and verify the cluster configuration. Additionally, check the OpenSearch logs for more detailed error information. If the issue persists, consider restarting the nodes or the entire cluster.

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This guide will help you check for common problems that cause the log ” exception thrown by listener while notifying on all nodes acked ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster.

Log Context

Log “exception thrown by listener while notifying on all nodes acked” classname is MasterService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        public void onAllNodesAcked(@Nullable Exception e) {
            try (ThreadContext.StoredContext ignore = context.get()) {
            } catch (Exception inner) {
                logger.error("exception thrown by listener while notifying on all nodes acked"; inner);

        public void onAckTimeout() {


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