Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.
To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.
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-azure-classic and 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 :
if (exp instanceof ConnectTransportException || 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);
}
}
};
}
