Failed to send ping to – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.17

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Briefly, this error occurs when Elasticsearch nodes in a cluster fail to communicate with each other. This could be due to network issues, incorrect configuration, or a node being down. To resolve this, ensure all nodes are running and reachable. Check your network settings and firewall rules to ensure they allow communication between nodes. Also, verify your Elasticsearch configuration, particularly the ‘discovery.zen.ping.unicast.hosts’ setting, to ensure it includes all nodes in the cluster.

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This guide will help you check for common problems that cause the log ” failed to send ping to [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery, ping.

Log Context

Log “failed to send ping to [{}]” classname is UnicastZenPing.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    || exp.getCause() instanceof ConnectTransportException
                    || exp.getCause() instanceof AlreadyClosedException) {
                    // ok; not connected...
                    logger.trace(() -> new ParameterizedMessage("failed to connect to {}"; node); exp);
                } else if (closed == false) {
                    logger.warn(() -> new ParameterizedMessage("failed to send ping to [{}]"; node); exp);
                }
            }
        };
    }

 

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