Unexpected error while finishing pinging round – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.3

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Briefly, this error occurs when OpenSearch encounters an unexpected issue during the pinging round, which is a process of checking the status of nodes in the cluster. This could be due to network issues, overloaded nodes, or configuration errors. To resolve this, you can check the network connectivity between nodes, ensure that nodes are not overloaded with tasks, and verify the cluster’s configuration settings. Additionally, checking the OpenSearch logs can provide more detailed information about the cause of the error.

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This guide will help you check for common problems that cause the log ” unexpected error while finishing pinging round ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: discovery.

Log Context

Log “unexpected error while finishing pinging round” classname is UnicastZenPing.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :


            public void onFailure(Exception e) {
                logger.warn("unexpected error while finishing pinging round"; e);
        }; scheduleDuration; ThreadPool.Names.GENERIC);

    // for testing


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